[libc-commits] [libc] Reland "[libc][NFC] Propagate LIBC_CONSTEXPR qualifier for those depending on bit_cast." (PR #197479)
LLVM Continuous Integration via libc-commits
libc-commits at lists.llvm.org
Wed May 13 08:48:44 PDT 2026
llvm-ci wrote:
LLVM Buildbot has detected a new failure on builder `libc-x86_64-debian-fullbuild-dbg` running on `libc-x86_64-debian-fullbuild` while building `libc` at step 4 "annotate".
Full details are available at: https://lab.llvm.org/buildbot/#/builders/179/builds/46890
<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)
...
[191/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.rand_util.dir/rand_util.cpp.o
[192/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.rand.dir/rand.cpp.o
[193/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.memalignment.dir/memalignment.cpp.o
[194/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtod.dir/strtod.cpp.o
[195/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.mbtowc.dir/mbtowc.cpp.o
[196/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtof.dir/strtof.cpp.o
[197/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtold.dir/strtold.cpp.o
[198/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.srand.dir/srand.cpp.o
[199/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.mbstowcs.dir/mbstowcs.cpp.o
[200/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/sprintf.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/sprintf.cpp:17:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/printf_main.h:15:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter.h:21:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter_atlas.h:32:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/float_dec_converter.h:17:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:733:25: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
LIBC_INLINE constexpr FloatToString(long double init_float)
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:734:9: note: non-constexpr constructor 'FPBits<long double>' cannot be used in a constant expression
: float_bits(init_float) {
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/FPUtil/FPBits.h:839:39: note: declared here
LIBC_INLINE LIBC_CONSTEXPR explicit FPBits(XType x) {
^
1 error generated.
[201/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.wcstombs.dir/wcstombs.cpp.o
[202/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vsprintf.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vsprintf.cpp:17:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/printf_main.h:15:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter.h:21:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter_atlas.h:32:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/float_dec_converter.h:17:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:733:25: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
LIBC_INLINE constexpr FloatToString(long double init_float)
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:734:9: note: non-constexpr constructor 'FPBits<long double>' cannot be used in a constant expression
: float_bits(init_float) {
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/FPUtil/FPBits.h:839:39: note: declared here
LIBC_INLINE LIBC_CONSTEXPR explicit FPBits(XType x) {
^
1 error generated.
[203/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vasprintf.cpp
Step 6 (build libc) failure: build libc (failure)
...
[191/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.rand_util.dir/rand_util.cpp.o
[192/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.rand.dir/rand.cpp.o
[193/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.memalignment.dir/memalignment.cpp.o
[194/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtod.dir/strtod.cpp.o
[195/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.mbtowc.dir/mbtowc.cpp.o
[196/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtof.dir/strtof.cpp.o
[197/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.strtold.dir/strtold.cpp.o
[198/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.srand.dir/srand.cpp.o
[199/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.mbstowcs.dir/mbstowcs.cpp.o
[200/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.sprintf.dir/sprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/sprintf.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/sprintf.cpp:17:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/printf_main.h:15:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter.h:21:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter_atlas.h:32:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/float_dec_converter.h:17:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:733:25: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
LIBC_INLINE constexpr FloatToString(long double init_float)
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:734:9: note: non-constexpr constructor 'FPBits<long double>' cannot be used in a constant expression
: float_bits(init_float) {
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/FPUtil/FPBits.h:839:39: note: declared here
LIBC_INLINE LIBC_CONSTEXPR explicit FPBits(XType x) {
^
1 error generated.
[201/700] Building CXX object libc/src/stdlib/CMakeFiles/libc.src.stdlib.wcstombs.dir/wcstombs.cpp.o
[202/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.vsprintf.dir/vsprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vsprintf.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vsprintf.cpp:17:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/printf_main.h:15:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter.h:21:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/converter_atlas.h:32:
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/printf_core/float_dec_converter.h:17:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:733:25: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr]
LIBC_INLINE constexpr FloatToString(long double init_float)
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/float_to_string.h:734:9: note: non-constexpr constructor 'FPBits<long double>' cannot be used in a constant expression
: float_bits(init_float) {
^
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/__support/FPUtil/FPBits.h:839:39: note: declared here
LIBC_INLINE LIBC_CONSTEXPR explicit FPBits(XType x) {
^
1 error generated.
[203/700] Building CXX object libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.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-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -D__LIBC_USE_BUILTIN_ISNAN -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 -mno-omit-leaf-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 -Wstrict-prototypes -Wthread-safety -Wglobal-constructors -DLIBC_COPT_PUBLIC_PACKAGING -DLIBC_COPT_PRINTF_RUNTIME_DISPATCH -std=gnu++17 -MD -MT libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o -MF libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o.d -o libc/src/stdio/CMakeFiles/libc.src.stdio.vasprintf.dir/vasprintf.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-fullbuild-dbg/llvm-project/libc/src/stdio/vasprintf.cpp
```
</details>
https://github.com/llvm/llvm-project/pull/197479
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