David Daney wrote:
The proper symbol to test would be something like:
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 or
__GCC_HAVE_SYNC_LOCK_TEST_AND_SET_4 they are automatically set by
GCC when the builtin functions are available.
$ /home/daney/gccsvn/mips64-trunk/gcc/xgcc
-B/home/daney/gccsvn/mips64-trunk/gcc/ -E -dM st.c | grep SYNC
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
Looking at http://gcc.gnu.org/viewcvs/trunk/gcc/c-cppbuiltin.c?revision=128218&view=markup
it seems that the __GCC_HAVE_SYNC_COMPARE_AND_SWAP_n macros are
explicitly defined if the machine supports them, but not any of the
other __SYNC_something builtins. Unless they come from somewhere else.
It's a shame that the viewcvs web thing doesn't have a "grep -R"
feature! Could someone with a source tree handly perhaps do a grep -R
HAVE_SYNC and see whether it finds anything else?
Regards,
Phil.
