[libc-commits] [libc] [libc] Refactor AUXV handling with new auxv.h header library (PR #162326)

[LLVM Continuous Integration via libc-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-x86_64-debian-dbg-asan` running on `libc-x86_64-debian` while building `libc` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/147/builds/30751

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py ...' (failure)
...
-- Skipping test for 'libc.src.string.memset_x86_64_opt_avx512' insufficient host cpu features 'AVX512F'
-- Skipping test for 'libc.src.strings.bcmp_x86_64_opt_avx512' insufficient host cpu features 'AVX512BW'
-- Skipping test for 'libc.src.strings.bzero_x86_64_opt_avx512' insufficient host cpu features 'AVX512F'
-- check-runtimes does nothing.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/build
@@@BUILD_STEP build libc@@@
Running: ninja libc
[1/2] Building CXX object libc/src/sys/auxv/linux/CMakeFiles/libc.src.sys.auxv.linux.getauxval.dir/getauxval.cpp.o
FAILED: libc/src/sys/auxv/linux/CMakeFiles/libc.src.sys.auxv.linux.getauxval.dir/getauxval.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/build/libc/include -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 -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -Wno-pass-failed -fno-omit-frame-pointer -fsanitize=address -fdiagnostics-color -g -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -fpie -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -Wnewline-eof -Wnonportable-system-include-path -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/sys/auxv/linux/CMakeFiles/libc.src.sys.auxv.linux.getauxval.dir/getauxval.cpp.o -MF libc/src/sys/auxv/linux/CMakeFiles/libc.src.sys.auxv.linux.getauxval.dir/getauxval.cpp.o.d -o libc/src/sys/auxv/linux/CMakeFiles/libc.src.sys.auxv.linux.getauxval.dir/getauxval.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/llvm-project/libc/src/sys/auxv/linux/getauxval.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/llvm-project/libc/src/sys/auxv/linux/getauxval.cpp:10:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/llvm-project/libc/src/__support/OSUtil/linux/auxv.h:101:50: error: use of undeclared identifier 'PR_GET_AUXV'
  long prctl_ret = syscall_impl<long>(SYS_prctl, PR_GET_AUXV,
                                                 ^
1 error generated.
ninja: build stopped: subcommand failed.
['ninja', 'libc'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 181, in step
    yield
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 143, in main
    run_command(['ninja', 'libc'])
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/build/../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 196, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/llvm-libc-buildbot/home/sivachandra/libc-x86_64-debian/libc-x86_64-debian-dbg-asan/llvm-zorg/zorg/buildbot/builders/annotated/util.py", line 49, in report_run_cmd
    subprocess.check_call(cmd, shell=shell, *args, **kwargs)
  File "/usr/lib/python3.11/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['ninja', 'libc']' returned non-zero exit status 1.
@@@STEP_FAILURE@@@
@@@BUILD_STEP libc-unit-tests@@@
Running: ninja libc-unit-tests
[1/1279] Running unit test libc.test.src.__support.block_test.__unit__
[==========] Running 23 tests from 1 test suite.
[ RUN      ] LlvmLibcBlockTest.CanCreateSingleAlignedBlock
[       OK ] LlvmLibcBlockTest.CanCreateSingleAlignedBlock (62 us)
[ RUN      ] LlvmLibcBlockTest.CanCreateUnalignedSingleBlock
[       OK ] LlvmLibcBlockTest.CanCreateUnalignedSingleBlock (5 us)
[ RUN      ] LlvmLibcBlockTest.CannotCreateTooSmallBlock
[       OK ] LlvmLibcBlockTest.CannotCreateTooSmallBlock (2 us)
[ RUN      ] LlvmLibcBlockTest.CanSplitBlock
[       OK ] LlvmLibcBlockTest.CanSplitBlock (13 us)
[ RUN      ] LlvmLibcBlockTest.CanSplitBlockUnaligned
[       OK ] LlvmLibcBlockTest.CanSplitBlockUnaligned (8 us)
[ RUN      ] LlvmLibcBlockTest.CanSplitMidBlock
[       OK ] LlvmLibcBlockTest.CanSplitMidBlock (12 us)

```

</details>

https://github.com/llvm/llvm-project/pull/162326