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Patch by Shawn Landden <shawnlandden@gmail.com> for kyotocabinet >= 1.2.76, which fixes
the configure test to handle lack of 8 byte atomics correctly as is the case with ARM 32
bit on all Fedora releases, Intel 32 bit on RHEL 5 and PowerPC 32 bit on RHEL 5 and all
Fedora releases.
--- kyotocabinet-1.2.76/configure.in 2012-05-24 13:31:42.000000000 +0200
+++ kyotocabinet-1.2.76/configure.in.8-byte-atomics 2013-03-01 00:21:21.000000000 +0100
@@ -238,9 +238,22 @@
# Atomic operations
if test "$enable_atomic" != "no"
then
- printf 'checking for atomic operations... '
- AC_TRY_COMPILE([], [__sync_fetch_and_add], [MYGCCATOMIC=yes], [MYGCCATOMIC=no])
- if test "$MYGCCATOMIC" = "yes"
+ printf 'checking for 8 byte atomic operations... '
+ if printf '
+/* Some targets support 4 byte atomics, but not 8 byte atomics,
+ * and will fail at link time if they are used.
+ *
+ * http://gcc.gnu.org/onlinedocs/gcc-4.6.3/gcc/Atomic-Builtins.html
+ * http://gcc.gnu.org/wiki/Atomic
+ */
+#include <stdint.h>
+int
+main ()
+{
+uint64_t n = 0xdeadbeaf;
+__sync_bool_compare_and_swap(&n, 0xdeadbeaf, 0);
+return n;
+}' | $CC -xc -o config.tmp - >/dev/null 2>&1
then
MYCPPFLAGS="$MYCPPFLAGS -D_MYGCCATOMIC"
printf 'yes\n'
--- kyotocabinet-1.2.76/configure 2012-05-24 13:31:45.000000000 +0200
+++ kyotocabinet-1.2.76/configure.8-byte-atomics 2013-03-01 00:22:37.000000000 +0100
@@ -4012,25 +4012,22 @@
# Atomic operations
if test "$enable_atomic" != "no"
then
- printf 'checking for atomic operations... '
- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-
+ printf 'checking for 8 byte atomic operations... '
+ if printf '
+/* Some targets support 4 byte atomics, but not 8 byte atomics,
+ * and will fail at link time if they are used.
+ *
+ * http://gcc.gnu.org/onlinedocs/gcc-4.6.3/gcc/Atomic-Builtins.html
+ * http://gcc.gnu.org/wiki/Atomic
+ */
+#include <stdint.h>
int
main ()
{
-__sync_fetch_and_add
- ;
- return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"; then :
- MYGCCATOMIC=yes
-else
- MYGCCATOMIC=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
- if test "$MYGCCATOMIC" = "yes"
+uint64_t n = 0xdeadbeaf;
+__sync_bool_compare_and_swap(&n, 0xdeadbeaf, 0);
+return n;
+}' | $CC -xc -o config.tmp - >/dev/null 2>&1
then
MYCPPFLAGS="$MYCPPFLAGS -D_MYGCCATOMIC"
printf 'yes\n'
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