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

[Alexey Samsonov]

clang-3.4? Do you use ToT Clang for that build?

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
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