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

LLVM Continuous Integration via libc-commits libc-commits at lists.llvm.org
Wed Oct 8 07:03:57 PDT 2025 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `libc-aarch64-ubuntu-fullbuild-dbg` running on `libc-aarch64-ubuntu` while building `libc` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/71/builds/32997

<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)
...
-- For aarch64 builtins preferring aarch64/fp_mode.c to fp_mode.c
-- check-runtimes does nothing.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/build
@@@BUILD_STEP build libc@@@
Running: ninja libc
[1/12] Building CXX object libc/startup/linux/aarch64/CMakeFiles/libc.startup.linux.aarch64.start.dir/start.cpp.o
[2/12] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.getenv.dir/getenv.cpp.o
[3/12] 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/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc -isystem 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 -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 -ffreestanding -DLIBC_FULL_BUILD -nostdlibinc -idirafter/usr/include -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 -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/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/sys/auxv/linux/getauxval.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/sys/auxv/linux/getauxval.cpp:10:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/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.
[4/12] Building CXX object libc/src/threads/CMakeFiles/libc.src.threads.call_once.dir/call_once.cpp.o
[5/12] Building CXX object libc/src/pthread/CMakeFiles/libc.src.pthread.pthread_once.dir/pthread_once.cpp.o
[6/12] Building CXX object libc/src/__support/time/linux/CMakeFiles/libc.src.__support.time.linux.clock_gettime.dir/clock_gettime.cpp.o
[7/12] Building CXX object libc/startup/linux/CMakeFiles/libc.startup.linux.do_start.dir/do_start.cpp.o
FAILED: libc/startup/linux/CMakeFiles/libc.startup.linux.do_start.dir/do_start.cpp.o 
/usr/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc -isystem 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 -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 -ffreestanding -DLIBC_FULL_BUILD -nostdlibinc -idirafter/usr/include -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 -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 -fno-stack-protector -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -DLIBC_COPT_TIMEOUT_ENSURE_MONOTONICITY=1 -std=gnu++17 -MD -MT libc/startup/linux/CMakeFiles/libc.startup.linux.do_start.dir/do_start.cpp.o -MF libc/startup/linux/CMakeFiles/libc.startup.linux.do_start.dir/do_start.cpp.o.d -o libc/startup/linux/CMakeFiles/libc.startup.linux.do_start.dir/do_start.cpp.o -c /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/startup/linux/do_start.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/startup/linux/do_start.cpp:12:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/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.
[8/12] Building CXX object libc/src/__support/OSUtil/linux/CMakeFiles/libc.src.__support.OSUtil.linux.vdso.dir/vdso.cpp.o
[9/12] Building CXX object libc/startup/linux/aarch64/CMakeFiles/libc.startup.linux.aarch64.tls.dir/tls.cpp.o
[10/12] Building CXX object libc/src/__support/threads/linux/CMakeFiles/libc.src.__support.threads.linux.thread.dir/thread.cpp.o
ninja: build stopped: subcommand failed.
['ninja', 'libc'] exited with return code 1.
The build step threw an exception...
Traceback (most recent call last):
  File "../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 181, in step
    yield
  File "../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 143, in main
    run_command(['ninja', 'libc'])
  File "../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py", line 196, in run_command
    util.report_run_cmd(cmd, cwd=directory)
  File "/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/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/python2.7/subprocess.py", line 190, in check_call
    raise CalledProcessError(retcode, cmd)
CalledProcessError: Command '['ninja', 'libc']' returned non-zero exit status 1
@@@STEP_FAILURE@@@
@@@BUILD_STEP build libc-startup@@@
Running: ninja libc-startup

```

</details>

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

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