As a first step toward removing Objective-C garbage collection from
Clang, remove support from the driver.  I'm hoping this will flush out
any expected bots/configurations/whatever that might rely on it.

I've left the options behind temporarily in -cc1 to keep tests passing.
I'll kill them off entirely in a follow up when I've had a chance to
update/delete the rest of Clang.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@288872 91177308-0d34-0410-b5e6-96231b3b80d8

Summary:
Just like gcc, we should have the -Og option as more and more software are using it:
https://llvm.org/bugs/show_bug.cgi?id=20765

Reviewers: echristo, dberlin, dblaikie, keith.walker.arm, rengolin

Subscribers: aprantl, friss, mehdi_amini, RKSimon, probinson, majnemer, cfe-commits

Differential Revision: https://reviews.llvm.org/D24998

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@286602 91177308-0d34-0410-b5e6-96231b3b80d8

Make the -print-libgcc-file-name option print an appropriate compiler
runtime library, that is libgcc.a if gcc runtime is used
and an appropriate compiler-rt library if that runtime is used.

The main use for this is to allow linking executables built with
-nodefaultlibs (e.g. to avoid linking to the standard C++ library) to
the compiler runtime library, e.g. using:

  clang++ ... -nodefaultlibs $(clang++ ... -print-libgcc-file-name)

in which case currently a program built like this linked to the gcc
runtime unconditionally. The patch fixes it to use compiler-rt libraries
instead when compiler-rt is the active runtime.

Differential Revision: https://reviews.llvm.org/D25338

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283746 91177308-0d34-0410-b5e6-96231b3b80d8

Revert the -print-libgcc-file-name change as the new test fails
on Darwin. It needs to be updated to run the libgcc part only on systems
supporting that rtlib.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283586 91177308-0d34-0410-b5e6-96231b3b80d8

Make the -print-libgcc-file-name option print an appropriate compiler
runtime library, that is libgcc.a if gcc runtime is used
and an appropriate compiler-rt library if that runtime is used.

The main use for this is to allow linking executables built with
-nodefaultlibs (e.g. to avoid linking to the standard C++ library) to
the compiler runtime library, e.g. using:

  clang++ ... -nodefaultlibs $(clang++ ... -print-libgcc-file-name)

in which case currently a program built like this linked to the gcc
runtime unconditionally. The patch fixes it to use compiler-rt libraries
instead when compiler-rt is the active runtime.

Differential Revision: https://reviews.llvm.org/D25338

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283572 91177308-0d34-0410-b5e6-96231b3b80d8

Warning, treated as error:
/opt/llvm/build.attributes.src/tools/clang/docs/CommandGuide/clang.rst:413: WARNING: unknown option: -save-stats=cwd


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282484 91177308-0d34-0410-b5e6-96231b3b80d8

This option behaves in a similar spirit as -save-temps and writes
internal llvm statistics in json format to a file.

Differential Revision: https://reviews.llvm.org/D24820

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282426 91177308-0d34-0410-b5e6-96231b3b80d8

Bot now complaining about -flto=thin reference, used similar workaround
for that failure.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282154 91177308-0d34-0410-b5e6-96231b3b80d8

The fix in r282148 was not enough to fix the following error:
/home/llvmbb/llvm-build-dir/clang-sphinx-docs/llvm/src/tools/clang/docs/CommandGuide/clang.rst:338:
WARNING: unknown option: -flto=full

on the sphinx bot:
  http://lab.llvm.org:8011/builders/clang-sphinx-docs/builds/16313

(not reproducible locally).

This time, simply remove the option reference.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282151 91177308-0d34-0410-b5e6-96231b3b80d8

/opt/llvm/build.attributes.src/tools/clang/docs/CommandGuide/clang.rst:338: WARNING: unknown option: -flto=full

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282148 91177308-0d34-0410-b5e6-96231b3b80d8

Summary: Add some user facing documentation on ThinLTO and how to use it.

Reviewers: mehdi_amini

Subscribers: mehdi_amini, cfe-commits

Differential Revision: https://reviews.llvm.org/D24806

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282089 91177308-0d34-0410-b5e6-96231b3b80d8

This patch adds an entry for "-rtlib" in the output of `man clang` and `clang -help`.

Patch by Lei Zhang!

Differential Revision: https://reviews.llvm.org/D24069

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281440 91177308-0d34-0410-b5e6-96231b3b80d8

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275076 91177308-0d34-0410-b5e6-96231b3b80d8

These options were referenced by other paragraphs, but never specified.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275075 91177308-0d34-0410-b5e6-96231b3b80d8

library for distribution to other machines on the clang man page.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@256287 91177308-0d34-0410-b5e6-96231b3b80d8

to enable the use of external type references in the debug info
(a.k.a. module debugging).

The driver expands -gmodules to "-g -fmodule-format=obj -dwarf-ext-refs"
and passes that to cc1. All this does at the moment is set a flag
codegenopts.

http://reviews.llvm.org/D11958

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@246192 91177308-0d34-0410-b5e6-96231b3b80d8

Summary:
This diff introduces .rst files, Sphinx config, and a CMake target
for building clang man pages. This will deprecate the existing .pod-
based man page, and will integrate nicely with CMake. This diff does
not remove the existing man page; that will be done in a follow-up
once packagers have had a chance to react to the change.

For now, only clang(1) has been done; others can be added over time
by dropping additional files into the docs/CommandGuide directory.
The index page for CommandGuide has been copied from LLVM's
docs/CommandGuide.

The man page itself is mostly the same, with a few minor cosmetic
changes. The only major change is the SYNOPSIS section. I was unable
to get .rst/Sphinx produce the same style as in the existing man page.
Instead, I changed it to match the LLVM tools' relatively simple style.

To build the man pages, use the "docs-clang-man" target if building
with CMake. Otherwise, use "make -f Makefile.sphinx man".

Reviewers: cmatthews, silvas

Subscribers: dim, gaeke, beanz, cfe-commits

Differential Revision: http://reviews.llvm.org/D10562

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241037 91177308-0d34-0410-b5e6-96231b3b80d8