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.. |nbsp| unicode:: 0xA0
:trim:
.. Roles generated by clang-tblgen.
.. role:: error
.. role:: warning
.. role:: remark
.. role:: diagtext
.. role:: placeholder(emphasis)
=========================
Diagnostic flags in Clang
=========================
.. contents::
:local:
Introduction
============
This page lists the diagnostic flags currently supported by Clang.
Diagnostic flags
================
-W
--
Synonym for `-Wextra`_.
-W#pragma-messages
------------------
This diagnostic is enabled by default.
**Diagnostic text:**
The text of this diagnostic is not controlled by Clang.
-W#warnings
-----------
This diagnostic is enabled by default.
**Diagnostic text:**
The text of this diagnostic is not controlled by Clang.
-WCFString-literal
------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`input conversion stopped due to an input byte that does not belong to the input codeset UTF-8`|
+------------------------------------------------------------------------------------------------------------------------------------+
-WCL4
-----
Some of the diagnostics controlled by this flag are enabled by default.
Controls `-Wall`_, `-Wextra`_.
-WIndependentClass-attribute
----------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'objc\_independent\_class' attribute may be put on a typedef only; attribute is ignored`|
+------------------------------------------------------------------------------------------------------------------------------+
+----------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'objc\_independent\_class' attribute may be put on Objective-C object pointer type only; attribute is ignored`|
+----------------------------------------------------------------------------------------------------------------------------------------------------+
-WNSObject-attribute
--------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'NSObject' attribute may be put on a typedef only; attribute is ignored`|
+--------------------------------------------------------------------------------------------------------------+
-Wabi
-----
This diagnostic flag exists for GCC compatibility, and has no effect in Clang.
-Wabsolute-value
----------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`absolute value function` |nbsp| :placeholder:`A` |nbsp| :diagtext:`given an argument of type` |nbsp| :placeholder:`B` |nbsp| :diagtext:`but has parameter of type` |nbsp| :placeholder:`C` |nbsp| :diagtext:`which may cause truncation of value`|
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+---------------------------------------------------------------------------+----------------------+---------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`taking the absolute value of` |nbsp| |+--------------------+| |nbsp| :diagtext:`type` |nbsp| :placeholder:`B` |nbsp| :diagtext:`is suspicious`|
| ||:diagtext:`pointer` || |
| |+--------------------+| |
| ||:diagtext:`function`|| |
| |+--------------------+| |
| ||:diagtext:`array` || |
| |+--------------------+| |
+---------------------------------------------------------------------------+----------------------+---------------------------------------------------------------------------------+
+------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`taking the absolute value of unsigned type` |nbsp| :placeholder:`A` |nbsp| :diagtext:`has no effect`|
+------------------------------------------------------------------------------------------------------------------------------------------+
+----------------------------------------------------+----------------------------+------------------------------------------------------------------------------------------------------------------+----------------------------+------------------------+
|:warning:`warning:` |nbsp| :diagtext:`using` |nbsp| |+--------------------------+| |nbsp| :diagtext:`absolute value function` |nbsp| :placeholder:`A` |nbsp| :diagtext:`when argument is of` |nbsp| |+--------------------------+| |nbsp| :diagtext:`type`|
| ||:diagtext:`integer` || ||:diagtext:`integer` || |
| |+--------------------------+| |+--------------------------+| |
| ||:diagtext:`floating point`|| ||:diagtext:`floating point`|| |
| |+--------------------------+| |+--------------------------+| |
| ||:diagtext:`complex` || ||:diagtext:`complex` || |
| |+--------------------------+| |+--------------------------+| |
+----------------------------------------------------+----------------------------+------------------------------------------------------------------------------------------------------------------+----------------------------+------------------------+
-Wabstract-final-class
----------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------+--------------------+-------------+
|:warning:`warning:` |nbsp| :diagtext:`abstract class is marked '`|+------------------+|:diagtext:`'`|
| ||:diagtext:`final` || |
| |+------------------+| |
| ||:diagtext:`sealed`|| |
| |+------------------+| |
+-----------------------------------------------------------------+--------------------+-------------+
-Wabstract-vbase-init
---------------------
**Diagnostic text:**
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`initializer for virtual base class` |nbsp| :placeholder:`A` |nbsp| :diagtext:`of abstract class` |nbsp| :placeholder:`B` |nbsp| :diagtext:`will never be used`|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Waddress
---------
This diagnostic is enabled by default.
Controls `-Wpointer-bool-conversion`_, `-Wstring-compare`_, `-Wtautological-pointer-compare`_.
-Waddress-of-array-temporary
----------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`pointer is initialized by a temporary array, which will be destroyed at the end of the full-expression`|
+---------------------------------------------------------------------------------------------------------------------------------------------+
-Waddress-of-packed-member
--------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`taking address of packed member` |nbsp| :placeholder:`A` |nbsp| :diagtext:`of class or structure` |nbsp| :placeholder:`B` |nbsp| :diagtext:`may result in an unaligned pointer value`|
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Waddress-of-temporary
----------------------
This diagnostic is an error by default, but the flag ``-Wno-address-of-temporary`` can be used to disable the error.
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------+
|:error:`error:` |nbsp| :diagtext:`taking the address of a temporary object of type` |nbsp| :placeholder:`A`|
+-----------------------------------------------------------------------------------------------------------+
-Waggregate-return
------------------
This diagnostic flag exists for GCC compatibility, and has no effect in Clang.
-Wall
-----
Some of the diagnostics controlled by this flag are enabled by default.
Controls `-Wmost`_, `-Wparentheses`_, `-Wswitch`_, `-Wswitch-bool`_.
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-Walloca-with-align-alignof
---------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`second argument to \_\_builtin\_alloca\_with\_align is supposed to be in bits`|
+--------------------------------------------------------------------------------------------------------------------+
-Wambiguous-delete
------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`multiple suitable` |nbsp| :placeholder:`A` |nbsp| :diagtext:`functions for` |nbsp| :placeholder:`B`:diagtext:`; no 'operator delete' function will be invoked if initialization throws an exception`|
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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-Wambiguous-ellipsis
--------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------+---------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'...' in this location creates a C-style varargs function`|+-------------------------------------------+|
| ||:diagtext:`, not a function parameter pack`||
| |+-------------------------------------------+|
| || ||
| |+-------------------------------------------+|
+------------------------------------------------------------------------------------------------+---------------------------------------------+
-Wambiguous-macro
-----------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`ambiguous expansion of macro` |nbsp| :placeholder:`A`|
+-------------------------------------------------------------------------------------------+
-Wambiguous-member-template
---------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`lookup of` |nbsp| :placeholder:`A` |nbsp| :diagtext:`in member access expression is ambiguous; using member of` |nbsp| :placeholder:`B`|
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Wanalyzer-incompatible-plugin
------------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+----------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`checker plugin '`:placeholder:`A`:diagtext:`' is not compatible with this version of the analyzer`|
+----------------------------------------------------------------------------------------------------------------------------------------+
-Wanonymous-pack-parens
-----------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`ISO C++11 requires a parenthesized pack declaration to have a name`|
+---------------------------------------------------------------------------------------------------------+
-Warc
-----
This diagnostic is enabled by default.
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committed
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-Warc-bridge-casts-disallowed-in-nonarc
---------------------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'`:placeholder:`A`:diagtext:`' casts have no effect when not using ARC`|
+-------------------------------------------------------------------------------------------------------------+
-Warc-maybe-repeated-use-of-weak
--------------------------------
**Diagnostic text:**
+---------------------------------------------------+-------------------------------+------------------------------------------------------------------------------------------+----------------------+-------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`weak` |nbsp| |+-----------------------------+| |nbsp| :placeholder:`B` |nbsp| :diagtext:`may be accessed multiple times in this` |nbsp| |+--------------------+| |nbsp| :diagtext:`and may be unpredictably set to nil; assign to a strong variable to keep the object alive`|
| ||:diagtext:`variable` || ||:diagtext:`function`|| |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`property` || ||:diagtext:`method` || |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`implicit property`|| ||:diagtext:`block` || |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`instance variable`|| ||:diagtext:`lambda` || |
| |+-----------------------------+| |+--------------------+| |
+---------------------------------------------------+-------------------------------+------------------------------------------------------------------------------------------+----------------------+-------------------------------------------------------------------------------------------------------------+
-Warc-non-pod-memaccess
-----------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------+-----------------------------+-----------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| |+---------------------------+| |nbsp| :diagtext:`this` |nbsp| :placeholder:`B` |nbsp| :diagtext:`call is a pointer to ownership-qualified type` |nbsp| :placeholder:`C`|
| ||:diagtext:`destination for`|| |
| |+---------------------------+| |
| ||:diagtext:`source of` || |
| |+---------------------------+| |
+---------------------------+-----------------------------+-----------------------------------------------------------------------------------------------------------------------------------------+
-Warc-performSelector-leaks
---------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`performSelector may cause a leak because its selector is unknown`|
+-------------------------------------------------------------------------------------------------------+
-Warc-repeated-use-of-weak
--------------------------
Also controls `-Warc-maybe-repeated-use-of-weak`_.
**Diagnostic text:**
+---------------------------------------------------+-------------------------------+--------------------------------------------------------------------------------------+----------------------+-------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`weak` |nbsp| |+-----------------------------+| |nbsp| :placeholder:`B` |nbsp| :diagtext:`is accessed multiple times in this` |nbsp| |+--------------------+| |nbsp| :diagtext:`but may be unpredictably set to nil; assign to a strong variable to keep the object alive`|
| ||:diagtext:`variable` || ||:diagtext:`function`|| |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`property` || ||:diagtext:`method` || |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`implicit property`|| ||:diagtext:`block` || |
| |+-----------------------------+| |+--------------------+| |
| ||:diagtext:`instance variable`|| ||:diagtext:`lambda` || |
| |+-----------------------------+| |+--------------------+| |
+---------------------------------------------------+-------------------------------+--------------------------------------------------------------------------------------+----------------------+-------------------------------------------------------------------------------------------------------------+
-Warc-retain-cycles
-------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`capturing` |nbsp| :placeholder:`A` |nbsp| :diagtext:`strongly in this block is likely to lead to a retain cycle`|
+------------------------------------------------------------------------------------------------------------------------------------------------------+
-Warc-unsafe-retained-assign
----------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+--------------------------------------------------------+---------------------------------+-------------------------------------+----------------------+------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`assigning` |nbsp| |+-------------------------------+| |nbsp| :diagtext:`to a weak` |nbsp| |+--------------------+|:diagtext:`; object will be released after assignment`|
| ||:diagtext:`array literal` || ||:diagtext:`property`|| |
| |+-------------------------------+| |+--------------------+| |
| ||:diagtext:`dictionary literal` || ||:diagtext:`variable`|| |
| |+-------------------------------+| |+--------------------+| |
| ||:diagtext:`numeric literal` || | | |
| |+-------------------------------+| | | |
| ||:diagtext:`boxed expression` || | | |
| |+-------------------------------+| | | |
| ||:diagtext:`<should not happen>`|| | | |
| |+-------------------------------+| | | |
| ||:diagtext:`block literal` || | | |
| |+-------------------------------+| | | |
+--------------------------------------------------------+---------------------------------+-------------------------------------+----------------------+------------------------------------------------------+
+---------------------------------------------------------------------------+--------------------------------+--------+----------------------+------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`assigning retained object to` |nbsp| |+------------------------------+| |nbsp| |+--------------------+|:diagtext:`; object will be released after assignment`|
| ||:diagtext:`weak` || ||:diagtext:`property`|| |
| |+------------------------------+| |+--------------------+| |
| ||:diagtext:`unsafe\_unretained`|| ||:diagtext:`variable`|| |
| |+------------------------------+| |+--------------------+| |
+---------------------------------------------------------------------------+--------------------------------+--------+----------------------+------------------------------------------------------+
+-----------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`assigning retained object to unsafe property; object will be released after assignment`|
+-----------------------------------------------------------------------------------------------------------------------------+
-Warray-bounds
--------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+-------------+
|:warning:`warning:` |nbsp| :diagtext:`array index` |nbsp| :placeholder:`A` |nbsp| :diagtext:`is past the end of the array (which contains` |nbsp| :placeholder:`B` |nbsp| :diagtext:`element`|+-------------+|:diagtext:`)`|
| || || |
| |+-------------+| |
| ||:diagtext:`s`|| |
| |+-------------+| |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+-------------+
+----------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`array index` |nbsp| :placeholder:`A` |nbsp| :diagtext:`is before the beginning of the array`|
+----------------------------------------------------------------------------------------------------------------------------------+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`array argument is too small; contains` |nbsp| :placeholder:`A` |nbsp| :diagtext:`elements, callee requires at least` |nbsp| :placeholder:`B`|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+-----------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'static' has no effect on zero-length arrays`|
+-----------------------------------------------------------------------------------+
-Warray-bounds-pointer-arithmetic
---------------------------------
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+-------------+
|:warning:`warning:` |nbsp| :diagtext:`the pointer incremented by` |nbsp| :placeholder:`A` |nbsp| :diagtext:`refers past the end of the array (that contains` |nbsp| :placeholder:`B` |nbsp| :diagtext:`element`|+-------------+|:diagtext:`)`|
| || || |
| |+-------------+| |
| ||:diagtext:`s`|| |
| |+-------------+| |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+-------------+
+-----------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`the pointer decremented by` |nbsp| :placeholder:`A` |nbsp| :diagtext:`refers before the beginning of the array`|
+-----------------------------------------------------------------------------------------------------------------------------------------------------+
-Wasm
-----
Richard Smith
committed
This diagnostic is enabled by default.
Controls `-Wasm-ignored-qualifier`_, `-Wasm-operand-widths`_.
-Wasm-ignored-qualifier
-----------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+----------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`ignored` |nbsp| :placeholder:`A` |nbsp| :diagtext:`qualifier on asm`|
+----------------------------------------------------------------------------------------------------------+
+-------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`meaningless 'volatile' on asm outside function`|
+-------------------------------------------------------------------------------------+
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-Wasm-operand-widths
--------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`value size does not match register size specified by the constraint and modifier`|
+-----------------------------------------------------------------------------------------------------------------------+
-Wassign-enum
-------------
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`integer constant not in range of enumerated type` |nbsp| :placeholder:`A`|
+---------------------------------------------------------------------------------------------------------------+
-Wassume
--------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`the argument to` |nbsp| :placeholder:`A` |nbsp| :diagtext:`has side effects that will be discarded`|
+-----------------------------------------------------------------------------------------------------------------------------------------+
-Wat-protocol
-------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`@protocol is using a forward protocol declaration of` |nbsp| :placeholder:`A`|
+-------------------------------------------------------------------------------------------------------------------+
-Watomic-memory-ordering
------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`memory order argument to atomic operation is invalid`|
+-------------------------------------------------------------------------------------------+
-Watomic-properties
-------------------
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committed
Controls `-Wcustom-atomic-properties`_, `-Wimplicit-atomic-properties`_.
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-Watomic-property-with-user-defined-accessor
--------------------------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------------------------------------+--------------------+-----------------------------------------------+--------------------+
|:warning:`warning:` |nbsp| :diagtext:`writable atomic property` |nbsp| :placeholder:`A` |nbsp| :diagtext:`cannot pair a synthesized` |nbsp| |+------------------+| |nbsp| :diagtext:`with a user defined` |nbsp| |+------------------+|
| ||:diagtext:`getter`|| ||:diagtext:`getter`||
| |+------------------+| |+------------------+|
| ||:diagtext:`setter`|| ||:diagtext:`setter`||
| |+------------------+| |+------------------+|
+--------------------------------------------------------------------------------------------------------------------------------------------+--------------------+-----------------------------------------------+--------------------+
-Wattribute-packed-for-bitfield
-------------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'packed' attribute was ignored on bit-fields with single-byte alignment in older versions of GCC and Clang`|
+-------------------------------------------------------------------------------------------------------------------------------------------------+
-Wattributes
------------
This diagnostic is enabled by default.
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Controls `-Wignored-attributes`_, `-Wunknown-attributes`_.
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-Wauto-disable-vptr-sanitizer
-----------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`implicitly disabling vptr sanitizer because rtti wasn't enabled`|
+------------------------------------------------------------------------------------------------------+
-Wauto-import
-------------
**Diagnostic text:**
+-------------------------------------------------+---------------------------------+-------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`treating #`|+-------------------------------+| |nbsp| :diagtext:`as an import of module '`:placeholder:`B`:diagtext:`'`|
| ||:diagtext:`include` || |
| |+-------------------------------+| |
| ||:diagtext:`import` || |
| |+-------------------------------+| |
| ||:diagtext:`include\_next` || |
| |+-------------------------------+| |
| ||:diagtext:`\_\_include\_macros`|| |
| |+-------------------------------+| |
+-------------------------------------------------+---------------------------------+-------------------------------------------------------------------------+
-Wauto-storage-class
--------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'auto' storage class specifier is not permitted in C++11, and will not be supported in future releases`|
+---------------------------------------------------------------------------------------------------------------------------------------------+
-Wauto-var-id
-------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'auto' deduced as 'id' in declaration of` |nbsp| :placeholder:`A`|
+-------------------------------------------------------------------------------------------------------+
-Wavailability
--------------
This diagnostic is enabled by default.
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'unavailable' availability overrides all other availability information`|
+--------------------------------------------------------------------------------------------------------------+
+------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`unknown platform` |nbsp| :placeholder:`A` |nbsp| :diagtext:`in availability macro`|
+------------------------------------------------------------------------------------------------------------------------+
+----------------------------------------------------------------+------------------------+------------------------------------------------------------------------------------------------------------------------------------------+------------------------+-------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`feature cannot be` |nbsp| |+----------------------+| |nbsp| :diagtext:`in` |nbsp| :placeholder:`B` |nbsp| :diagtext:`version` |nbsp| :placeholder:`C` |nbsp| :diagtext:`before it was` |nbsp| |+----------------------+| |nbsp| :diagtext:`in version` |nbsp| :placeholder:`E`:diagtext:`; attribute ignored`|
| ||:diagtext:`introduced`|| ||:diagtext:`introduced`|| |
| |+----------------------+| |+----------------------+| |
| ||:diagtext:`deprecated`|| ||:diagtext:`deprecated`|| |
| |+----------------------+| |+----------------------+| |
| ||:diagtext:`obsoleted` || ||:diagtext:`obsoleted` || |
| |+----------------------+| |+----------------------+| |
+----------------------------------------------------------------+------------------------+------------------------------------------------------------------------------------------------------------------------------------------+------------------------+-------------------------------------------------------------------------------------+
+---------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`use same version number separators '\_' or '.'; as in 'major\[.minor\[.subminor\]\]'`|
+---------------------------------------------------------------------------------------------------------------------------+
+---------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`availability does not match previous declaration`|
+---------------------------------------------------------------------------------------+
+---------------------------+--------------------------------+--------------------------+-------------------------------+--------+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| |+------------------------------+|:diagtext:`method` |nbsp| |+-----------------------------+| |nbsp| |+---------------------------------------------+| |nbsp| :diagtext:`on` |nbsp| :placeholder:`B` |nbsp| :diagtext:`(`:placeholder:`C` |nbsp| :diagtext:`vs.` |nbsp| :placeholder:`D`:diagtext:`)`|
| || || ||:diagtext:`introduced after` || ||:diagtext:`the protocol method it implements`|| |
| |+------------------------------+| |+-----------------------------+| |+---------------------------------------------+| |
| ||:diagtext:`overriding` |nbsp| || ||:diagtext:`deprecated before`|| ||:diagtext:`overridden method` || |
| |+------------------------------+| |+-----------------------------+| |+---------------------------------------------+| |
| | | ||:diagtext:`obsoleted before` || | | |
| | | |+-----------------------------+| | | |
+---------------------------+--------------------------------+--------------------------+-------------------------------+--------+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
+---------------------------+--------------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------+--------------------------------+
|:warning:`warning:` |nbsp| |+------------------------------+|:diagtext:`method cannot be unavailable on` |nbsp| :placeholder:`A` |nbsp| :diagtext:`when` |nbsp| |+---------------------------------------------+| |nbsp| :diagtext:`is available`|
| || || ||:diagtext:`the protocol method it implements`|| |
| |+------------------------------+| |+---------------------------------------------+| |
| ||:diagtext:`overriding` |nbsp| || ||:diagtext:`its overridden method` || |
| |+------------------------------+| |+---------------------------------------------+| |
+---------------------------+--------------------------------+---------------------------------------------------------------------------------------------------+-----------------------------------------------+--------------------------------+
-Wbackend-plugin
----------------
This diagnostic is enabled by default.
**Diagnostic text:**
The text of this diagnostic is not controlled by Clang.
-Wbackslash-newline-escape
--------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`backslash and newline separated by space`|
+-------------------------------------------------------------------------------+
-Wbad-function-cast
-------------------
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`cast from function call of type` |nbsp| :placeholder:`A` |nbsp| :diagtext:`to non-matching type` |nbsp| :placeholder:`B`|
+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Wbind-to-temporary-copy
------------------------
Also controls `-Wc++98-compat-bind-to-temporary-copy`_.
**Diagnostic text:**
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
|:warning:`warning:` |nbsp| :diagtext:`C++98 requires an accessible copy constructor for class` |nbsp| :placeholder:`C` |nbsp| :diagtext:`when binding a reference to a temporary; was` |nbsp| |+---------------------+|
| ||:diagtext:`private` ||
| |+---------------------+|
| ||:diagtext:`protected`||
| |+---------------------+|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
+--------------------------------------------------------------------+-----------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`no viable constructor` |nbsp| |+---------------------------------------+| |nbsp| :diagtext:`of type` |nbsp| :placeholder:`B`:diagtext:`; C++98 requires a copy constructor when binding a reference to a temporary`|
| ||:diagtext:`copying variable` || |
| |+---------------------------------------+| |
| ||:diagtext:`copying parameter` || |
| |+---------------------------------------+| |
| ||:diagtext:`returning object` || |
| |+---------------------------------------+| |
| ||:diagtext:`throwing object` || |
| |+---------------------------------------+| |
| ||:diagtext:`copying member subobject` || |
| |+---------------------------------------+| |
| ||:diagtext:`copying array element` || |
| |+---------------------------------------+| |
| ||:diagtext:`allocating object` || |
| |+---------------------------------------+| |
| ||:diagtext:`copying temporary` || |
| |+---------------------------------------+| |
| ||:diagtext:`initializing base subobject`|| |
| |+---------------------------------------+| |
| ||:diagtext:`initializing vector element`|| |
| |+---------------------------------------+| |
| ||:diagtext:`capturing value` || |
| |+---------------------------------------+| |
+--------------------------------------------------------------------+-----------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
-Wbitfield-constant-conversion
------------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
Richard Smith
committed
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`implicit truncation from` |nbsp| :placeholder:`C` |nbsp| :diagtext:`to bit-field changes value from` |nbsp| :placeholder:`A` |nbsp| :diagtext:`to` |nbsp| :placeholder:`B`|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Richard Smith
committed
-Wbitfield-enum-conversion
--------------------------
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`bit-field` |nbsp| :placeholder:`A` |nbsp| :diagtext:`is not wide enough to store all enumerators of` |nbsp| :placeholder:`B`|
+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`signed bit-field` |nbsp| :placeholder:`A` |nbsp| :diagtext:`needs an extra bit to represent the largest positive enumerators of` |nbsp| :placeholder:`B`|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`assigning value of signed enum type` |nbsp| :placeholder:`B` |nbsp| :diagtext:`to unsigned bit-field` |nbsp| :placeholder:`A`:diagtext:`; negative enumerators of enum` |nbsp| :placeholder:`B` |nbsp| :diagtext:`will be converted to positive values`|
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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-Wbitfield-width
----------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+
|:warning:`warning:` |nbsp| :diagtext:`width of anonymous bit-field (`:placeholder:`A` |nbsp| :diagtext:`bits) exceeds width of its type; value will be truncated to` |nbsp| :placeholder:`B` |nbsp| :diagtext:`bit`|+-------------+|
| || ||
| |+-------------+|
| ||:diagtext:`s`||
| |+-------------+|
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+
|:warning:`warning:` |nbsp| :diagtext:`width of bit-field` |nbsp| :placeholder:`A` |nbsp| :diagtext:`(`:placeholder:`B` |nbsp| :diagtext:`bits) exceeds the width of its type; value will be truncated to` |nbsp| :placeholder:`C` |nbsp| :diagtext:`bit`|+-------------+|
| || ||
| |+-------------+|
| ||:diagtext:`s`||
| |+-------------+|
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+
-Wbitwise-op-parentheses
------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'`:placeholder:`A`:diagtext:`' within '`:placeholder:`B`:diagtext:`'`|
+-----------------------------------------------------------------------------------------------------------+
Richard Smith
committed
-Wblock-capture-autoreleasing
-----------------------------
This diagnostic is enabled by default.
Richard Smith
committed
**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`block captures an autoreleasing out-parameter, which may result in use-after-free bugs`|
+-----------------------------------------------------------------------------------------------------------------------------+
Richard Smith
committed
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-Wbool-conversion
-----------------
This diagnostic is enabled by default.
Also controls `-Wpointer-bool-conversion`_, `-Wundefined-bool-conversion`_.
**Diagnostic text:**
+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`initialization of pointer of type` |nbsp| :placeholder:`A` |nbsp| :diagtext:`to null from a constant boolean expression`|
+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Wbool-conversions
------------------
Synonym for `-Wbool-conversion`_.
-Wbraced-scalar-init
--------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+-----------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`braces around scalar initializer`|
+-----------------------------------------------------------------------+
-Wbridge-cast
-------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :placeholder:`A` |nbsp| :diagtext:`bridges to` |nbsp| :placeholder:`B`:diagtext:`, not` |nbsp| :placeholder:`C`|
+------------------------------------------------------------------------------------------------------------------------------------------+
+-------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :placeholder:`A` |nbsp| :diagtext:`cannot bridge to` |nbsp| :placeholder:`B`|
+-------------------------------------------------------------------------------------------------------+
-Wbuiltin-macro-redefined
-------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+---------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`redefining builtin macro`|
+---------------------------------------------------------------+
+---------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`undefining builtin macro`|
+---------------------------------------------------------------+
-Wbuiltin-memcpy-chk-size
-------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :placeholder:`A` |nbsp| :diagtext:`will always overflow destination buffer`|
+------------------------------------------------------------------------------------------------------+
-Wbuiltin-requires-header
-------------------------
This diagnostic is enabled by default.
**Diagnostic text:**
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`declaration of built-in function '`:placeholder:`B`:diagtext:`' requires inclusion of the header <`:placeholder:`A`:diagtext:`>`|
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-Wc++-compat
------------
**Diagnostic text:**
+---------------------------+---------------------------+--------------------+--------------------------------------------+---------------------------+--------------------------+
|:warning:`warning:` |nbsp| |+-------------------------+|+------------------+| |nbsp| :diagtext:`has size 0 in C,` |nbsp| |+-------------------------+| |nbsp| :diagtext:`in C++`|
| || |||:diagtext:`struct`|| ||:diagtext:`size 1` || |
| |+-------------------------+|+------------------+| |+-------------------------+| |
| ||:diagtext:`empty` |nbsp| |||:diagtext:`union` || ||:diagtext:`non-zero size`|| |
| |+-------------------------+|+------------------+| |+-------------------------+| |
+---------------------------+---------------------------+--------------------+--------------------------------------------+---------------------------+--------------------------+
-Wc++0x-compat
--------------
Synonym for `-Wc++11-compat`_.
-Wc++0x-extensions
------------------
Synonym for `-Wc++11-extensions`_.
-Wc++0x-narrowing
-----------------
Synonym for `-Wc++11-narrowing`_.
-Wc++11-compat
--------------
Some of the diagnostics controlled by this flag are enabled by default.
Richard Smith
committed
Also controls `-Wc++11-compat-deprecated-writable-strings`_, `-Wc++11-compat-reserved-user-defined-literal`_, `-Wc++11-narrowing`_, `-Wc++98-c++11-c++14-compat`_, `-Wc++98-c++11-compat`_.
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**Diagnostic text:**
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------+------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`integer literal is too large to be represented in type 'long' and is subject to undefined behavior under C++98, interpreting as 'unsigned long'; this literal will` |nbsp| |+---------------------------------+| |nbsp| :diagtext:`in C++11 onwards`|
| ||:diagtext:`have type 'long long'`|| |
| |+---------------------------------+| |
| ||:diagtext:`be ill-formed` || |
| |+---------------------------------+| |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------+------------------------------------+
+--------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'auto' storage class specifier is redundant and incompatible with C++11`|
+--------------------------------------------------------------------------------------------------------------+
+-------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`identifier after literal will be treated as a user-defined literal suffix in C++11`|
+-------------------------------------------------------------------------------------------------------------------------+
+-------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`'`:placeholder:`A`:diagtext:`' is a keyword in C++11`|
+-------------------------------------------------------------------------------------------+
+--------------------------------------------------------------------------------------------------------------------------------+
|:warning:`warning:` |nbsp| :diagtext:`use of right-shift operator ('>>') in template argument will require parentheses in C++11`|