Mercurial > sdl-ios-xcode
diff configure.in @ 5004:0c72ae7b7cb2
Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Changed the CAS return value to bool, so it's efficient with OSAtomicCompareAndSwap32Barrier()
Added an atomic test adapted from code by Michael Davidsaver
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 16 Jan 2011 15:16:39 -0800 |
| parents | 3a95a2b93eb3 |
| children | 5d7d48157be7 |
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--- a/configure.in Sat Jan 15 12:41:59 2011 -0800 +++ b/configure.in Sun Jan 16 15:16:39 2011 -0800 @@ -181,7 +181,7 @@ DEPENDENCY_TRACKING_OPTIONS="-MMD -MT \$@" fi fi - + dnl See whether we are allowed to use the system C library AC_ARG_ENABLE(libc, AC_HELP_STRING([--enable-libc], [Use the system C library [[default=yes]]]), @@ -285,6 +285,32 @@ AC_DEFINE(uintptr_t, unsigned long) fi +dnl See whether we can use gcc atomic operations on this architecture +AC_ARG_ENABLE(gcc-atomics, +AC_HELP_STRING([--enable-gcc-atomics], + [Use gcc builtin atomics [[default=yes]]]), + , enable_gcc_atomics=yes) +if test x$enable_gcc_atomics = xyes; then + have_gcc_atomics=no + AC_MSG_CHECKING(for GCC builtin atomic operations) + AC_TRY_LINK([ + ],[ + int a; + void *x, *y, *z; + __sync_lock_test_and_set(&a, 4); + __sync_fetch_and_add(&a, 1); + __sync_bool_compare_and_swap(&a, 5, 10); + __sync_bool_compare_and_swap(&x, y, z); + ],[ + have_gcc_atomics=yes + ]) + AC_MSG_RESULT($have_gcc_atomics) + + if test x$have_gcc_mmd_mt = xyes; then + AC_DEFINE(HAVE_GCC_ATOMICS) + fi +fi + # Standard C sources SOURCES="$SOURCES $srcdir/src/*.c" SOURCES="$SOURCES $srcdir/src/audio/*.c"