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