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r329052 | hans | 2018-04-03 02:28:21 -0700 (Tue, 03 Apr 2018) | 1 line

UsersManual.rst: update text for /GX- to match r328708
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$ bin/clang-tblgen -gen-diag-docs -I../cfe.src/include/clang/Basic \
    ../cfe.src/include/clang/Basic/Diagnostic.td \
    -o ../cfe.src/docs/DiagnosticsReference.rst



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$ bin/clang-tblgen -gen-opt-docs -I../cfe.src/include \
    -I../cfe.src/include/clang/Driver -I../llvm.src/include \
    ../cfe.src/include/clang/Driver/ClangOptionDocs.td \
    -o ../cfe.src/docs/ClangCommandLineReference.rst


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By Nico Weber


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By Nico Weber!


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Patch by Amara Emerson.

Differential Revision: https://reviews.llvm.org/D42860


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Differential Revision: https://reviews.llvm.org/D42307




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The OpenMP runtime has no dedicated Release Notes, so add it to Clang's
section about OpenMP.

Differential Revision: https://reviews.llvm.org/D42352



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Differential Revision: https://reviews.llvm.org/D42360


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r323123 | hahnfeld | 2018-01-22 16:27:45 +0100 (Mon, 22 Jan 2018) | 6 lines

[DOCS] Mention OpenMP Tools Interface in runtime library

Also list supported configurations (architectures + operating
systems).

Differential Revision: https://reviews.llvm.org/D42349
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r322018 | abataev | 2018-01-08 11:02:51 -0800 (Mon, 08 Jan 2018) | 9 lines

[OPENMP] Current status of OpenMP support.

Summary: Some info about supported features of OpenMP 4.5-5.0.

Reviewers: hfinkel, rsmith

Subscribers: kkwli0, Hahnfeld, cfe-commits

Differential Revision: https://reviews.llvm.org/D39457
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Differential Revision: https://reviews.llvm.org/D41711

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$ bin/clang-tblgen -gen-opt-docs -I../cfe.src/include \
    -I../cfe.src/include/clang/Driver -I../llvm.src/include \
    ../cfe.src/include/clang/Driver/ClangOptionDocs.td \
    -o ../cfe.src/docs/ClangCommandLineReference.rst


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$ bin/clang-tblgen -gen-attr-docs -I../cfe.src/include \
    ../cfe.src/include/clang/Basic/Attr.td \
    -o ../cfe.src/docs/AttributeReference.rst


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Clang is inherently a cross compiler and can generate code for any target
enabled during build. It however requires to specify many parameters in the
invocation, which could be hardcoded during configuration process in the
case of single-target compiler. The purpose of configuration files is to
make specifying clang arguments easier.

A configuration file is a collection of driver options, which are inserted
into command line before other options specified in the clang invocation.
It groups related options together and allows specifying them in simpler,
more flexible and less error prone way than just listing the options
somewhere in build scripts. Configuration file may be thought as a "macro"
that names an option set and is expanded when the driver is called.

Use of configuration files is described in `UserManual.rst`.

Differential Revision: https://reviews.llvm.org/D24933


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Need to check targets in tests more carefully.



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Clang is inherently a cross compiler and can generate code for any target
enabled during build. It however requires to specify many parameters in the
invocation, which could be hardcoded during configuration process in the
case of single-target compiler. The purpose of configuration files is to
make specifying clang arguments easier.

A configuration file is a collection of driver options, which are inserted
into command line before other options specified in the clang invocation.
It groups related options together and allows specifying them in simpler,
more flexible and less error prone way than just listing the options
somewhere in build scripts. Configuration file may be thought as a "macro"
that names an option set and is expanded when the driver is called.

Use of configuration files is described in `UserManual.rst`.

Differential Revision: https://reviews.llvm.org/D24933


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We used to advertise private modules to be declared as submodules
(Foo.Private). This has proven to not scale well since private headers
might carry several dependencies, introducing unwanted content into the
main module and often causing dep cycles.

Change the canonical way to name it to Foo_Private, forcing private
modules as top level ones, and provide warnings under -Wprivate-module
to suggest fixes for other private naming. Update documentation to
reflect that.

rdar://problem/31173501

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Diagnose 'unreachable' UB when a noreturn function returns.

  1. Insert a check at the end of functions marked noreturn.

  2. A decl may be marked noreturn in the caller TU, but not marked in
     the TU where it's defined. To diagnose this scenario, strip away the
     noreturn attribute on the callee and insert check after calls to it.

Testing: check-clang, check-ubsan, check-ubsan-minimal, D40700

rdar://33660464

Differential Revision: https://reviews.llvm.org/D40698

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Most attributes will now use the Clang<"name"> construct to provide both __attribute__((name)) and [[clang::name]] syntaxes for the attribute. Attributes deviating from this should be marked with a comment explaining why they are not supported under both spellings. Common reasons are: the attribute is provided by some other specification that controls the syntax or the attribute cannot be exposed under a particular spelling for some given reason.

Because this is a mechanical change that only introduces new spellings, there are no test cases for the commit.

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builtin macros

This patch implements the __is_target_arch, __is_target_vendor, __is_target_os,
and __is_target_environment Clang preprocessor extensions that were proposed by
@compnerd in Bob's cfe-dev post:
http://lists.llvm.org/pipermail/cfe-dev/2017-November/056166.html.

These macros can be used to examine the components of the target triple at
compile time. A has_builtin(is_target_???) preprocessor check can be used to
check for their availability.

__is_target_arch allows you to check if an arch is specified without worring
about a specific subarch, e.g.

__is_target_arch(arm) returns 1 for the target arch "armv7"
__is_target_arch(armv7) returns 1 for the target arch "armv7"
__is_target_arch(armv6) returns 0 for the target arch "armv7"

__is_target_vendor and __is_target_environment match the specific vendor
or environment. __is_target_os matches the specific OS, but
__is_target_os(darwin) will match any Darwin-based OS. "Unknown" can be used
to test if the triple's component is specified.

rdar://35753116

Differential Revision: https://reviews.llvm.org/D41087


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This adds a new command line option -mprefer-vector-width to specify a preferred vector width for the vectorizers. Valid values are 'none' and unsigned integers. The driver will check that it meets those constraints. Specific supported integers will be managed by the targets in the backend.

Clang will take the value and add it as a new function attribute during CodeGen.

This represents the alternate direction proposed by Sanjay in this RFC: http://lists.llvm.org/pipermail/llvm-dev/2017-November/118734.html

The syntax here matches gcc, though gcc treats it as an x86 specific command line argument. gcc only allows values of 128, 256, and 512. I'm not having clang check any values.

Differential Revision: https://reviews.llvm.org/D40230

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This is C++14 with conforming GNU extensions.

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This adds -std=c17, -std=gnu17, and -std=iso9899:2017 as language mode flags for C17 and updates the value of __STDC_VERSION__ to the value based on the C17 FDIS. Given that this ballot cannot succeed until 2018, it is expected that we (and GCC) will add c18 flags as aliases once the ballot passes.

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This behaves similar to the __has_cpp_attribute builtin macro in that it allows users to detect whether an attribute is supported with the [[]] spelling syntax, which can be enabled in C with -fdouble-square-bracket-attributes.

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