| Issue |
63793
|
| Summary |
Attempting to cross-compile libclang_rt.profile.a with -DCOMPILER_RT_BUILD_PROFILE=ON generates native object files
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| Labels |
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| Assignees |
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| Reporter |
ian-collins-ctct
|
Hello,
I have been building and using an ARM cross of the builtins for a while and I wanted to try profile guides optimisation on the target.
I changed my cmake rune to use `-DCOMPILER_RT_BUILD_PROFILE=ON` (previously OFF) and it appears to build but my test application built fails with
`ld.lld: error: /usr/lib/llvm-16/lib/clang/16/lib/armv7a-r2-linux-gnueabihf/libclang_rt.profile.a(InstrProfilingRuntime.cpp.o) is incompatible with elf32-littlearm`
Checking what was generated for ninja:
`$ ninja -t commands | grep InstrProfilingRuntime.cpp.o`
`/usr/bin/clang++-16 -I/build/compiler-rt/lib/profile/.. -I/build/compiler-rt/lib/profile/../../include -Wall -Wno-unused-parameter -O3 -DNDEBUG -fno-lto -fPIC -Wno-pedantic -DCOMPILER_RT_HAS_ATOMICS=1 -DCOMPILER_RT_HAS_FCNTL_LCK=1 -DCOMPILER_RT_HAS_UNAME=1 -nostdinc++ -std=c++17 -MD -MT lib/profile/CMakeFiles/clang_rt.profile-armhf.dir/InstrProfilingRuntime.cpp.o -MF lib/profile/CMakeFiles/clang_rt.profile-armhf.dir/InstrProfilingRuntime.cpp.o.d -o lib/profile/CMakeFiles/clang_rt.profile-armhf.dir/InstrProfilingRuntime.cpp.o -c /build/compiler-rt/lib/profile/InstrProfilingRuntime.cpp`
Note the lack of the expected --target option.
I am currently building on tag llvmorg-16.0.6.
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