[llvm] [llvm-exegesis] Make SubprocessMemoryTest use PIDs (PR #65245)

[Björn Pettersson via llvm-commits]

bjope wrote:





> Hi, on AIX there is the error:
> 
> ```
> FAILED: unittests/tools/llvm-exegesis/CMakeFiles/LLVMExegesisTests.dir/X86/SubprocessMemoryTest.cpp.o 
> /usr/local/clang-15.0.0/bin/clang++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_LARGE_FILE_API -D_LIBCPP_ENABLE_HARDENED_MODE -D_XOPEN_SOURCE=700 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/unittests/tools/llvm-exegesis -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/unittests/tools/llvm-exegesis -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/include -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/include -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/tools/llvm-exegesis/lib -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/lib/Target/X86 -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/Target/X86 -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/lib/Target/AArch64 -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/Target/AArch64 -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/lib/Target/PowerPC -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/Target/PowerPC -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/lib/Target/Mips -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/build/lib/Target/Mips -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/third-party/unittest/googletest/include -I/scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/third-party/unittest/googlemock/include -mcmodel=large -fPIC -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wno-variadic-macros -Wno-gnu-zero-variadic-macro-arguments -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -std=c++17 -MD -MT unittests/tools/llvm-exegesis/CMakeFiles/LLVMExegesisTests.dir/X86/SubprocessMemoryTest.cpp.o -MF unittests/tools/llvm-exegesis/CMakeFiles/LLVMExegesisTests.dir/X86/SubprocessMemoryTest.cpp.o.d -o unittests/tools/llvm-exegesis/CMakeFiles/LLVMExegesisTests.dir/X86/SubprocessMemoryTest.cpp.o -c /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/unittests/tools/llvm-exegesis/X86/SubprocessMemoryTest.cpp
> /scratch/powerllvm/powerllvm_env/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/unittests/tools/llvm-exegesis/X86/SubprocessMemoryTest.cpp:25:31: error: unused variable 'TestCount' [-Werror,-Wunused-const-variable]
> static constexpr const size_t TestCount = 4;
>                               ^
> 1 error generated.
> ```
> 
> https://lab.llvm.org/buildbot/#/builders/214/builds/9384
> 
> Looks like the variable should be guarded too?

Attempted to fix that here: https://github.com/llvm/llvm-project/commit/7b3f6e64a0636fab9924afae5ba23f61adfac990

https://github.com/llvm/llvm-project/pull/65245