[libc-commits] [libc] [libc] Build with -Wshadow (PR #196519)
LLVM Continuous Integration via libc-commits
libc-commits at lists.llvm.org
Tue May 12 06:55:20 PDT 2026
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/48063
<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)
...
[60/594] Building CXX object libc/src/__support/threads/CMakeFiles/libc.src.__support.threads.thread.dir/thread.cpp.o
[61/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.__restore.dir/__restore.cpp.o
[62/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_one_ui.dir/stdc_first_trailing_one_ui.cpp.o
[63/594] Building CXX object libc/src/stdio/generic/CMakeFiles/libc.src.stdio.generic.fgetc_unlocked.dir/fgetc_unlocked.cpp.o
[64/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_count_zeros_ui.dir/stdc_count_zeros_ui.cpp.o
[65/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ull.dir/stdc_first_trailing_zero_ull.cpp.o
[66/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_one_ull.dir/stdc_first_trailing_one_ull.cpp.o
[67/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ul.dir/stdc_first_trailing_zero_ul.cpp.o
[68/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_one_ull.dir/stdc_first_leading_one_ull.cpp.o
[69/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o
FAILED: libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.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 -Wno-pass-failed -fdiagnostics-color -g -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_COPT_TIMEOUT_ENSURE_MONOTONICITY -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -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 -fstack-protector-strong -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 -Wshadow -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o -MF libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o.d -o libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o -c /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/kill.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/kill.cpp:15:
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/signal_utils.h:22:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:273:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:284:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
2 errors generated.
[70/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_zero_ul.dir/stdc_first_leading_zero_ul.cpp.o
[71/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_one_uc.dir/stdc_first_leading_one_uc.cpp.o
[72/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o
FAILED: libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.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 -Wno-pass-failed -fdiagnostics-color -g -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_COPT_TIMEOUT_ENSURE_MONOTONICITY -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -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 -fstack-protector-strong -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 -Wshadow -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_RWLOCK_DEFAULT_SPIN_COUNT=100 -std=gnu++17 -MD -MT libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o -MF libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o.d -o libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o -c /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/sigaction.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/sigaction.cpp:14:
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/signal_utils.h:22:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:273:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:284:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
2 errors generated.
[73/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ui.dir/stdc_first_trailing_zero_ui.cpp.o
[74/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_zero_us.dir/stdc_first_leading_zero_us.cpp.o
Step 6 (build libc) failure: build libc (failure)
...
[60/594] Building CXX object libc/src/__support/threads/CMakeFiles/libc.src.__support.threads.thread.dir/thread.cpp.o
[61/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.__restore.dir/__restore.cpp.o
[62/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_one_ui.dir/stdc_first_trailing_one_ui.cpp.o
[63/594] Building CXX object libc/src/stdio/generic/CMakeFiles/libc.src.stdio.generic.fgetc_unlocked.dir/fgetc_unlocked.cpp.o
[64/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_count_zeros_ui.dir/stdc_count_zeros_ui.cpp.o
[65/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ull.dir/stdc_first_trailing_zero_ull.cpp.o
[66/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_one_ull.dir/stdc_first_trailing_one_ull.cpp.o
[67/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ul.dir/stdc_first_trailing_zero_ul.cpp.o
[68/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_one_ull.dir/stdc_first_leading_one_ull.cpp.o
[69/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o
FAILED: libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.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 -Wno-pass-failed -fdiagnostics-color -g -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_COPT_TIMEOUT_ENSURE_MONOTONICITY -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -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 -fstack-protector-strong -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 -Wshadow -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -std=gnu++17 -MD -MT libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o -MF libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o.d -o libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.kill.dir/kill.cpp.o -c /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/kill.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/kill.cpp:15:
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/signal_utils.h:22:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:273:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:284:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
2 errors generated.
[70/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_zero_ul.dir/stdc_first_leading_zero_ul.cpp.o
[71/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_one_uc.dir/stdc_first_leading_one_uc.cpp.o
[72/594] Building CXX object libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o
FAILED: libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.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 -Wno-pass-failed -fdiagnostics-color -g -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_COPT_STRING_LENGTH_IMPL=clang_vector -DLIBC_COPT_FIND_FIRST_CHARACTER_IMPL=word -DLIBC_ADD_NULL_CHECKS -DLIBC_ERRNO_MODE=LIBC_ERRNO_MODE_DEFAULT -DLIBC_THREAD_MODE=LIBC_THREAD_MODE_PLATFORM -DLIBC_COPT_TIMEOUT_ENSURE_MONOTONICITY -DLIBC_CONF_WCTYPE_MODE=LIBC_WCTYPE_MODE_ASCII -DLIBC_COPT_RAW_MUTEX_DEFAULT_SPIN_COUNT=100 -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 -fstack-protector-strong -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 -Wshadow -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_RWLOCK_DEFAULT_SPIN_COUNT=100 -std=gnu++17 -MD -MT libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o -MF libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o.d -o libc/src/signal/linux/CMakeFiles/libc.src.signal.linux.sigaction.dir/sigaction.cpp.o -c /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/sigaction.cpp
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/sigaction.cpp:14:
In file included from /home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/signal/linux/signal_utils.h:22:
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:273:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:284:23: error: declaration shadows a field of '__llvm_libc_20_0_0_git::rwlock::RwState' [-Werror,-Wshadow]
[=](RwState state) {
^
/home/libc-buildbot/libc-aarch64-ubuntu/libc-aarch64-ubuntu-fullbuild-dbg/llvm-project/libc/src/__support/threads/raw_rwlock.h:150:7: note: previous declaration is here
int state;
^
2 errors generated.
[73/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_trailing_zero_ui.dir/stdc_first_trailing_zero_ui.cpp.o
[74/594] Building CXX object libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_first_leading_zero_us.dir/stdc_first_leading_zero_us.cpp.o
```
</details>
https://github.com/llvm/llvm-project/pull/196519
More information about the libc-commits
mailing list