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AC_CHECK_FUNC(objc_sync_enter,, [
AC_SUBST(OBJC_SYNC_M, "objc_sync.m")
AC_DEFINE(NEED_OBJC_SYNC_INIT, 1,
[Whether objc_sync_init needs to be called])])
atomic_ops="none"
AC_MSG_CHECKING(whether __sync_* works)
AC_TRY_LINK([#include <stdint.h>], [
int32_t i, j;
if (__sync_add_and_fetch(&i, 1))
j = __sync_sub_and_fetch(&i, 1);
while (!__sync_bool_compare_and_swap(&i, 0, 1));
], [
AC_MSG_RESULT(yes)
atomic_ops="gcc builtins"
AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
[Whether gcc atomic operations are available])
], [
old_OBJCFLAGS="$OBJCFLAGS"
OBJCFLAGS="$OBJCFLAGS -march=i486"
AC_TRY_LINK([#include <stdint.h>], [
int32_t i, j;
if (__sync_add_and_fetch(&i, 1))
j = __sync_sub_and_fetch(&i, 1);
while (!__sync_bool_compare_and_swap(&i, 0, 1));
], [
AC_MSG_RESULT([yes, with -march=i486])
atomic_ops="gcc builtins (with -march=i486)"
AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
[Whether gcc atomic operations are available])
AC_SUBST(ATOMIC_OBJCFLAGS, "-march=i486")
], [
AC_MSG_RESULT(no)
OBJCFLAGS="$old_OBJCFLAGS"])])
if test x"$atomic_ops" = x"none"; then
AC_CHECK_HEADER(libkern/OSAtomic.h, [
atomic_ops="libkern/OSAtomic.h"
AC_DEFINE(OF_HAVE_LIBKERN_OSATOMIC_H, 1,
[Whether we have libkern/OSAtomic.h])])
fi
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AC_CHECK_FUNC(objc_sync_enter,, [
AC_SUBST(OBJC_SYNC_M, "objc_sync.m")
AC_DEFINE(NEED_OBJC_SYNC_INIT, 1,
[Whether objc_sync_init needs to be called])])
atomic_ops="none"
AC_MSG_CHECKING(whether we have an atomic ops assembly implementation)
AC_EGREP_CPP(yes, [
#if defined(__GNUC__) && (defined(__i386__) || \
defined(__amd64__) || defined(__x86_64__))
yes
#endif
], [
AC_MSG_RESULT(yes)
atomic_ops="assembly implementation"
], [AC_MSG_RESULT(no)])
if test x"$atomic_ops" = x"none"; then
AC_MSG_CHECKING(whether __sync_* works)
AC_TRY_LINK([#include <stdint.h>], [
int32_t i, j;
if (__sync_add_and_fetch(&i, 1))
j = __sync_sub_and_fetch(&i, 1);
while (!__sync_bool_compare_and_swap(&i, 0, 1));
], [
AC_MSG_RESULT(yes)
atomic_ops="gcc builtins"
AC_DEFINE(OF_HAVE_GCC_ATOMIC_OPS, 1,
[Whether gcc atomic operations are available])
], [AC_MSG_RESULT(no)])
fi
if test x"$atomic_ops" = x"none"; then
AC_CHECK_HEADER(libkern/OSAtomic.h, [
atomic_ops="libkern/OSAtomic.h"
AC_DEFINE(OF_HAVE_LIBKERN_OSATOMIC_H, 1,
[Whether we have libkern/OSAtomic.h])])
fi
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