| Issue |
127916
|
| Summary |
[libc] thread.cpp fails to build with GCC on x86_64
|
| Labels |
libc
|
| Assignees |
|
| Reporter |
michaelrj-google
|
It seems like there's an issue with clean fullbuilds with GCC. My guess is something to do with register exhaustion, since the syscall is wrapped in two layers of `always_inline` functions, but I'm not sure.
CMake command:
`cmake ../runtimes -G Ninja -DLLVM_ENABLE_RUNTIMES="libc;compiler-rt" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DLLVM_LIBC_FULL_BUILD=ON -DLLVM_LIBC_INCLUDE_SCUDO=ON -DCOMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC=ON -DCOMPILER_RT_BUILD_GWP_ASAN=OFF -DCOMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED=OFF`
Tested on the latest commit (6342095bce61f18baf7c305716be3239a274fb6d)
Build failure:
```
~/llvm-project/build-gcc$ ninja libc
[297/373] Building CXX object libc/src/__support/threads/l...s/libc.src.__support.threads.linux.thread.dir/thread.cpp.o
FAILED: libc/src/__support/threads/linux/CMakeFiles/libc.src.__support.threads.linux.thread.dir/thread.cpp.o
/usr/bin/g++ -DLIBC_NAMESPACE=__llvm_libc_21_0_0_git -D_DEBUG -I~/llvm-project/libc -isystem ~/llvm-project/build-gcc/libc/include -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -std=gnu++17 -DLIBC_QSORT_IMPL=LIBC_QSORT_QUICK_SORT -DLIBC_ADD_NULL_CHECKS -fpie -ffreestanding -DLIBC_FULL_BUILD -isystem/usr/lib/gcc/x86_64-linux-gnu/14//include -nostdinc -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 -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wdeprecated -fext-numeric-literals -Wno-pedantic -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -O3 -Wno-frame-address -MD -MT libc/src/__support/threads/linux/CMakeFiles/libc.src.__support.threads.linux.thread.dir/thread.cpp.o -MF libc/src/__support/threads/linux/CMakeFiles/libc.src.__support.threads.linux.thread.dir/thread.cpp.o.d -o libc/src/__support/threads/linux/CMakeFiles/libc.src.__support.threads.linux.thread.dir/thread.cpp.o -c ~/llvm-project/libc/src/__support/threads/linux/thread.cpp
In file included from ~/llvm-project/libc/src/__support/CPP/type_traits/integral_constant.h:11,
from ~/llvm-project/libc/src/__support/CPP/type_traits/has_unique_object_representations.h:11,
from ~/llvm-project/libc/src/__support/CPP/atomic.h:12,
from ~/llvm-project/libc/src/__support/threads/thread.h:12,
from ~/llvm-project/libc/src/__support/threads/linux/thread.cpp:9:
In function ‘long int __llvm_libc_21_0_0_git::syscall_impl(long int, long int, long int)’,
inlined from ‘R __llvm_libc_21_0_0_git::syscall_impl(long int, Ts ...) [with R = long int; Ts = {void*, long unsigned int}]’ at ~/llvm-project/libc/src/__support/OSUtil/linux/syscall.h:34:49,
inlined from ‘void __llvm_libc_21_0_0_git::free_stack(void*, size_t, size_t)’ at ~/llvm-project/libc/src/__support/threads/linux/thread.cpp:128:37,
inlined from ‘void __llvm_libc_21_0_0_git::cleanup_thread_resources(ThreadAttributes*)’ at ~/llvm-project/libc/src/__support/threads/linux/thread.cpp:153:15,
inlined from ‘int __llvm_libc_21_0_0_git::Thread::run(__llvm_libc_21_0_0_git::ThreadStyle, __llvm_libc_21_0_0_git::ThreadRunner, void*, void*, size_t, size_t, bool)’ at ~/llvm-project/libc/src/__support/threads/linux/thread.cpp:335:29:
~/llvm-project/libc/src/__support/macros/attributes.h:28:25: error: ‘asm’ operand has impossible constraints or there are not enough registers
28 | #define LIBC_INLINE_ASM __asm__ __volatile__
| ^~~~~~~
~/llvm-project/libc/src/__support/OSUtil/linux/x86_64/syscall.h:39:3: note: in expansion of macro ‘LIBC_INLINE_ASM’
39 | LIBC_INLINE_ASM("syscall"
| ^~~~~~~~~~~~~~~
```
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