Riyaz Puthiyapurayil via llvm-dev
2019-Jan-27 21:13 UTC
[llvm-dev] Building libclang_rt.* results in error with -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
Building 32-bit libclang_rt.*.so libraries result in error when cmake is invoked
with -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON. The error is due to a link line for
32-bit libclang_rt.*.so using libclang_rt.builtins-x86_64.a instead of
libclang_rt.builtins-i386.a. I am making an in-tree build of LLVM, clang, libc++
and compiler-rt (version 7.0.0). The compiler used for building is clang 5.0.2.
FAILED: lib64/clang/7.0.0/lib/linux/libclang_rt.ubsan_standalone-i386.so
....
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(udivdi3.c.o)'
is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(udivmoddi4.c.o)'
is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(umoddi3.c.o)'
is incompatible with i386 output
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)
I traced the problem to the following in
projects/compiler-rt/cmake/config-ix.cmake (which was not there in version 5.0
of compiler-rt).
check_library_exists(c fopen "" COMPILER_RT_HAS_LIBC)
if (COMPILER_RT_USE_BUILTINS_LIBRARY)
include(HandleCompilerRT)
find_compiler_rt_library(builtins COMPILER_RT_BUILTINS_LIBRARY)
else()
if (ANDROID)
check_library_exists(gcc __gcc_personality_v0 ""
COMPILER_RT_HAS_GCC_LIB)
else()
check_library_exists(gcc_s __gcc_personality_v0 ""
COMPILER_RT_HAS_GCC_S_LIB)
endif()
endif()
find_compiler_rt_library set COMPILER_RT_BUILTINS_LIBRARY to
.../libclang_rt.builtins-x86_64.a regardless of the architecture. This library
then gets added to the sanitizer libs link line. There is an attempt to specify
the architecture in find_compiler_rt_library by passing
-target=CMAKE_CXX_COMPILER_TARGET but I am not sure where that is supposed to be
set. I cannot set it from my own cmake command line because I am building a
64-bit clang with both 64-bit and 32-bit target libraries. Building it this way
worked without any issues in LLVM 5.0. But with 7.0, the intent seems to be use
COMPILER_RT_USE_BUILTINS_LIBRARY but it does not set
COMPILER_RT_BUILTINS_LIBRARY based on architecture of the output file (i.e. use
libclang_rt.builtins-x86_64.a for creating
libclang_rt.ubsan.standalone-x86_64.so and libclang_rt.builtins-i386.a for
creating libclang_rt.ubsan.standalone-i386.so).
Any suggestions how to fix this cleanly? Or is there anything I should set
besides or in lieu of COMPILER_RT_USE_BUILTINS_LIBRARY on cmake command line.
Note that I want to make a self-contained clang/llvm build with no dependencies
on libgcc. This was something I was able to do with 5.0.0 with
SANITIZER_USE_COMPILER_RT but that seems to not work anymore.
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Riyaz Puthiyapurayil via llvm-dev
2019-Jan-27 21:27 UTC
[llvm-dev] Building libclang_rt.* results in error with -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
This seems to be related to:
https://bugs.llvm.org/show_bug.cgi?id=38025
/Riyaz
From: Riyaz Puthiyapurayil
Sent: Sunday, January 27, 2019 1:14 PM
To: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Building libclang_rt.* results in error with
-DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
Building 32-bit libclang_rt.*.so libraries result in error when cmake is invoked
with -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON. The error is due to a link line for
32-bit libclang_rt.*.so using libclang_rt.builtins-x86_64.a instead of
libclang_rt.builtins-i386.a. I am making an in-tree build of LLVM, clang, libc++
and compiler-rt (version 7.0.0). The compiler used for building is clang 5.0.2.
FAILED: lib64/clang/7.0.0/lib/linux/libclang_rt.ubsan_standalone-i386.so
....
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(udivdi3.c.o)'
is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(udivmoddi4.c.o)'
is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file
`/usr/lib64/clang/5.0.2/lib/linux/libclang_rt.builtins-x86_64.a(umoddi3.c.o)'
is incompatible with i386 output
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)
I traced the problem to the following in
projects/compiler-rt/cmake/config-ix.cmake (which was not there in version 5.0
of compiler-rt).
check_library_exists(c fopen "" COMPILER_RT_HAS_LIBC)
if (COMPILER_RT_USE_BUILTINS_LIBRARY)
include(HandleCompilerRT)
find_compiler_rt_library(builtins COMPILER_RT_BUILTINS_LIBRARY)
else()
if (ANDROID)
check_library_exists(gcc __gcc_personality_v0 ""
COMPILER_RT_HAS_GCC_LIB)
else()
check_library_exists(gcc_s __gcc_personality_v0 ""
COMPILER_RT_HAS_GCC_S_LIB)
endif()
endif()
find_compiler_rt_library set COMPILER_RT_BUILTINS_LIBRARY to
.../libclang_rt.builtins-x86_64.a regardless of the architecture. This library
then gets added to the sanitizer libs link line. There is an attempt to specify
the architecture in find_compiler_rt_library by passing
-target=CMAKE_CXX_COMPILER_TARGET but I am not sure where that is supposed to be
set. I cannot set it from my own cmake command line because I am building a
64-bit clang with both 64-bit and 32-bit target libraries. Building it this way
worked without any issues in LLVM 5.0. But with 7.0, the intent seems to be use
COMPILER_RT_USE_BUILTINS_LIBRARY but it does not set
COMPILER_RT_BUILTINS_LIBRARY based on architecture of the output file (i.e. use
libclang_rt.builtins-x86_64.a for creating
libclang_rt.ubsan.standalone-x86_64.so and libclang_rt.builtins-i386.a for
creating libclang_rt.ubsan.standalone-i386.so).
Any suggestions how to fix this cleanly? Or is there anything I should set
besides or in lieu of COMPILER_RT_USE_BUILTINS_LIBRARY on cmake command line.
Note that I want to make a self-contained clang/llvm build with no dependencies
on libgcc. This was something I was able to do with 5.0.0 with
SANITIZER_USE_COMPILER_RT but that seems to not work anymore.
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