x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdatomic/atomic_thread_fence.c -o stdatomic/atomic_thread_fence -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
/var/lib/managarm-buildenv/build/tools/system-gcc/lib/gcc/x86_64-managarm/14.2.0/../../../../x86_64-managarm/bin/ld: ../out/managarm/include/stdatomic/atomic_thread_fence.o:(.data.rel+0x0): undefined reference to `atomic_thread_fence'
collect2: error: ld returned 1 exit status