Peter Maydell <peter.mayd...@linaro.org> writes: > On 25 April 2017 at 09:58, Nikunj A Dadhania <nik...@linux.vnet.ibm.com> > wrote: >> I was trying out the program in the configure script with clang and I do >> get errors without libatomic: >> >> $ clang /tmp/atomic.c >> /tmp/atomic.c:6:7: warning: implicit declaration of function >> '__atomic_load_8' is invalid in C99 [-Wimplicit-function-declaration] >> y = __atomic_load_8(&x, 0); >> ^ >> /tmp/atomic.c:7:3: warning: implicit declaration of function >> '__atomic_store_8' is invalid in C99 [-Wimplicit-function-declaration] >> __atomic_store_8(&x, y, 0); >> ^ >> /tmp/atomic.c:8:3: warning: implicit declaration of function >> '__atomic_compare_exchange_8' is invalid in C99 >> [-Wimplicit-function-declaration] >> __atomic_compare_exchange_8(&x, &y, x, 0, 0, 0); >> ^ >> /tmp/atomic.c:9:3: warning: implicit declaration of function >> '__atomic_exchange_8' is invalid in C99 [-Wimplicit-function-declaration] >> __atomic_exchange_8(&x, y, 0); >> ^ >> /tmp/atomic.c:10:3: warning: implicit declaration of function >> '__atomic_fetch_add_8' is invalid in C99 [-Wimplicit-function-declaration] >> __atomic_fetch_add_8(&x, y, 0); >> ^ >> 5 warnings generated. >> /tmp/atomic-1660e0.o: In function `main': >> /tmp/atomic.c:(.text+0x28): undefined reference to `__atomic_load_8' >> /tmp/atomic.c:(.text+0x40): undefined reference to `__atomic_store_8' >> /tmp/atomic.c:(.text+0x69): undefined reference to >> `__atomic_compare_exchange_8' >> /tmp/atomic.c:(.text+0x7d): undefined reference to `__atomic_exchange_8' >> /tmp/atomic.c:(.text+0x91): undefined reference to `__atomic_fetch_add_8' >> clang-3.9: error: linker command failed with exit code 1 (use -v to see >> invocation) >> >> With -latomic, the linker succeeds in getting the binary. > > What host is this on ?
$ uname -a Linux abhimanyu 4.9.13-200.fc25.x86_64 #1 SMP Mon Feb 27 16:48:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux $ Regards Nikunj
