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 ? thanks -- PMM
