[libc-commits] [libc] [libc] Refactor _build_gpu_objects cmake function. (PR #80631)

[Joseph Huber via libc-commits]

https://github.com/jhuber6 commented:

```
[736/992] Linking CXX executable libc/test/integration/startup/gpu/libc.test.integration.startup.gpu.init_fini_array_test.__build__
FAILED: libc/test/integration/startup/gpu/libc.test.integration.startup.gpu.init_fini_array_test.__build__ 
: && /home/jhuber/Documents/llvm/llvm-project/build/./bin/clang++ --target=x86_64-unknown-linux-gnu -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -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 -fuse-ld=lld -Wl,--color-diagnostics    -nostdlib -static libc/src/__support/RPC/CMakeFiles/libc.src.__support.RPC.rpc_client.__internal__.dir/rpc_client.cpp.o libc/src/__support/OSUtil/gpu/CMakeFiles/libc.src.__support.OSUtil.gpu.gpu_util.__internal__.dir/quick_exit.cpp.o libc/src/__support/OSUtil/gpu/CMakeFiles/libc.src.__support.OSUtil.gpu.gpu_util.__internal__.dir/io.cpp.o libc/src/stdlib/CMakeFiles/libc.src.stdlib._Exit.__internal__.dir/_Exit.cpp.o libc/src/__support/CPP/CMakeFiles/libc.src.__support.CPP.new.__internal__.dir/new.cpp.o libc/src/stdlib/CMakeFiles/libc.src.stdlib.atexit.__internal__.dir/atexit.cpp.o libc/src/stdlib/CMakeFiles/libc.src.stdlib.exit.__internal__.dir/exit.cpp.o libc/startup/gpu/nvptx/CMakeFiles/libc.startup.gpu.nvptx.crt1.dir/start.cpp.o libc/test/IntegrationTest/CMakeFiles/libc.test.IntegrationTest.test.dir/test.cpp.o libc/src/string/CMakeFiles/libc.src.string.bcmp.__internal__.dir/bcmp.cpp.o libc/src/string/CMakeFiles/libc.src.string.bzero.__internal__.dir/bzero.cpp.o libc/src/string/CMakeFiles/libc.src.string.memcmp.__internal__.dir/memcmp.cpp.o libc/src/string/CMakeFiles/libc.src.string.memcpy.__internal__.dir/memcpy.cpp.o libc/src/string/CMakeFiles/libc.src.string.memmove.__internal__.dir/memmove.cpp.o libc/src/string/CMakeFiles/libc.src.string.memset.__internal__.dir/memset.cpp.o libc/test/integration/startup/gpu/CMakeFiles/libc.test.integration.startup.gpu.init_fini_array_test.__build__.dir/init_fini_array_test.cpp.o -o libc/test/integration/startup/gpu/libc.test.integration.startup.gpu.init_fini_array_test.__build__  -march=sm_89  --target=nvptx64-nvidia-cuda  --cuda-path=/opt/cuda && :
nvlink fatal   : cubin not an elf?
```
Getting these typical errors. Means something either isn't built with `--target=` or we picked up an incorrect file.

https://github.com/llvm/llvm-project/pull/80631