[compiler-rt] r225049 - Avoid building compiler-rt with LTO.

Fri Jan 2 13:34:02 PST 2015

Alright. Do you think we should fix Clang so that "clang -fno-lto foo.S"
doesn't print warnings?

On Fri, Jan 2, 2015 at 1:31 PM, David Blaikie <dblaikie at gmail.com> wrote:

>
>
> On Fri, Jan 2, 2015 at 1:28 PM, Alexey Samsonov <vonosmas at gmail.com>
> wrote:
>
>> clang-3.4? Do you use ToT Clang for that build?
>>
>
> I rebuilt & installed ToT. It's just the CMake build never bothers to
> update the binary name once it's configured:
>
> $ clang --version
> clang version 3.6.0 (trunk 225013) (llvm/trunk 225080)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> $ which clang
> /usr/local/google/home/blaikie/install/bin/clang
> $ ll `which clang`
> lrwxrwxrwx 1 blaikie eng 9 Sep 18 20:07
> /usr/local/google/home/blaikie/install/bin/clang -> clang-3.4*
>
>
>>
>> FWIW, I think the driver shouldn't print unused-argument warning in this
>> case.
>>
>> On Fri, Jan 2, 2015 at 11:22 AM, David Blaikie <dblaikie at gmail.com>
>> wrote:
>>
>>> Seems to be breaking my build?
>>>
>>> [54/816] Building C object
>>> projects/compiler-rt/lib/tsan/CMakeFiles/clang_rt.tsan-x86_64.dir/rtl/tsan_rtl_amd64.S.o
>>> FAILED: /usr/local/google/home/blaikie/install/bin/clang  -D_DEBUG
>>> -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
>>> -D__STDC_LIMIT_MACROS -fcolor-diagnostics -fPIC -Wall -W
>>> -Wno-unused-parameter -Wwrite-strings -Wmissing-field-initializers
>>> -pedantic -Wno-long-long -Wcovered-switch-default -Werror
>>> -fcolor-diagnostics -ffunction-sections -fdata-sections -Wall -Werror -g
>>> -Iprojects/compiler-rt/lib/tsan
>>> -I/usr/local/google/home/blaikie/dev/llvm/src/projects/compiler-rt/lib/tsan
>>> -Iinclude -I/usr/local/google/home/blaikie/dev/llvm/src/include
>>> -I/usr/local/google/home/blaikie/dev/llvm/src/projects/compiler-rt/lib/tsan/..
>>>    -gsplit-dwarf  -m64 -fPIC -fno-builtin -fno-exceptions
>>> -fomit-frame-pointer -funwind-tables -fno-stack-protector
>>> -fvisibility=hidden -fno-function-sections -fno-lto -O3 -gline-tables-only
>>> -Wno-gnu -Wno-variadic-macros -Wno-c99-extensions -Wno-non-virtual-dtor
>>> -fPIE -fno-rtti -Wframe-larger-than=512 -Wglobal-constructors -MMD -MT
>>> projects/compiler-rt/lib/tsan/CMakeFiles/clang_rt.tsan-x86_64.dir/rtl/tsan_rtl_amd64.S.o
>>> -MF
>>> projects/compiler-rt/lib/tsan/CMakeFiles/clang_rt.tsan-x86_64.dir/rtl/tsan_rtl_amd64.S.o.d
>>> -o
>>> projects/compiler-rt/lib/tsan/CMakeFiles/clang_rt.tsan-x86_64.dir/rtl/tsan_rtl_amd64.S.o
>>>   -c
>>> /usr/local/google/home/blaikie/dev/llvm/src/projects/compiler-rt/lib/tsan/rtl/tsan_rtl_amd64.S
>>> clang-3.4: error: argument unused during compilation: '-fno-lto'
>>>
>>> On Wed, Dec 31, 2014 at 10:20 AM, Rafael Espindola <
>>> rafael.espindola at gmail.com> wrote:
>>>
>>>> Author: rafael
>>>> Date: Wed Dec 31 12:20:52 2014
>>>> New Revision: 225049
>>>>
>>>> URL: http://llvm.org/viewvc/llvm-project?rev=225049&view=rev
>>>> Log:
>>>> Avoid building compiler-rt with LTO.
>>>>
>>>> During a LTO we still need to build a compiler_rt with regular object
>>>> files
>>>> in the .a.
>>>>
>>>> Modified:
>>>>     compiler-rt/trunk/CMakeLists.txt
>>>>     compiler-rt/trunk/cmake/config-ix.cmake
>>>>
>>>> Modified: compiler-rt/trunk/CMakeLists.txt
>>>> URL:
>>>> http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/CMakeLists.txt?rev=225049&r1=225048&r2=225049&view=diff
>>>>
>>>> ==============================================================================
>>>> --- compiler-rt/trunk/CMakeLists.txt (original)
>>>> +++ compiler-rt/trunk/CMakeLists.txt Wed Dec 31 12:20:52 2014
>>>> @@ -231,6 +231,7 @@ append_list_if(COMPILER_RT_HAS_FUNWIND_T
>>>>  append_list_if(COMPILER_RT_HAS_FNO_STACK_PROTECTOR_FLAG
>>>> -fno-stack-protector SANITIZER_COMMON_CFLAGS)
>>>>  append_list_if(COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG
>>>> -fvisibility=hidden SANITIZER_COMMON_CFLAGS)
>>>>  append_list_if(COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG
>>>> -fno-function-sections SANITIZER_COMMON_CFLAGS)
>>>> +append_list_if(COMPILER_RT_HAS_FNO_LTO_FLAG -fno-lto
>>>> SANITIZER_COMMON_CFLAGS)
>>>>
>>>>  if(MSVC)
>>>>    # Replace the /MD[d] flags with /MT.
>>>>
>>>> Modified: compiler-rt/trunk/cmake/config-ix.cmake
>>>> URL:
>>>> http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/cmake/config-ix.cmake?rev=225049&r1=225048&r2=225049&view=diff
>>>>
>>>> ==============================================================================
>>>> --- compiler-rt/trunk/cmake/config-ix.cmake (original)
>>>> +++ compiler-rt/trunk/cmake/config-ix.cmake Wed Dec 31 12:20:52 2014
>>>> @@ -16,6 +16,7 @@ check_cxx_compiler_flag(-ffreestanding
>>>>  check_cxx_compiler_flag("-Werror -fno-function-sections"
>>>> COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG)
>>>>  check_cxx_compiler_flag(-std=c++11
>>>>  COMPILER_RT_HAS_STD_CXX11_FLAG)
>>>>  check_cxx_compiler_flag(-ftls-model=initial-exec
>>>> COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC)
>>>> +check_cxx_compiler_flag(-fno-lto
>>>>  COMPILER_RT_HAS_FNO_LTO_FLAG)
>>>>
>>>>  check_cxx_compiler_flag(/GR COMPILER_RT_HAS_GR_FLAG)
>>>>  check_cxx_compiler_flag(/GS COMPILER_RT_HAS_GS_FLAG)
>>>>
>>>>
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>>>>
>>>
>>>
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>>>
>>
>>
>> --
>> Alexey Samsonov
>> vonosmas at gmail.com
>>
>
>

-- 
Alexey Samsonov
vonosmas at gmail.com
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