Fix GNU atomics detection support, enable caching for them

diff --git a/configure.ac b/configure.ac
index d06e90d7a36abe946b9b9a3d9d407199d2128495..076623db6501d14d53d09f3c9fe128b546b40931 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -419,11 +419,10 @@ SQUID_DEFINE_BOOL(_USE_INLINE_,$enable_inline,
 # to be used by sub-commands
 export enable_inline
 
-dnl
-dnl Check for atomic operations support in the compiler
-dnl
-AC_MSG_CHECKING([for GNU atomic operations support])
+# Check for atomic operations support in the compiler
+AC_CACHE_CHECK([for GNU atomic operations support],[squid_cv_gnu_atomics],[
 AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <cstdint>
     int32_t n_32 = 0;
     uint64_t n_64 = 0;
 ]],[[
@@ -433,7 +432,7 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
     __sync_sub_and_fetch(&n_32, 15); // n becomes 15
     __sync_bool_compare_and_swap(&n_32, 15, 201); // n becomes 201
     __sync_fetch_and_and(&n_32, 200); // n becomes 200
-    if (n != 200) return -1;
+    if (n_32 != 200) return -1;
 
     // 64-bit
     __sync_add_and_fetch(&n_64, 10); // n becomes 10
@@ -447,12 +446,12 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
     return 0;
 ]])],
 [
-    AC_DEFINE(HAVE_ATOMIC_OPS,1,[Define to 1 if you have GCC __sync_add_and_fetch() and such])
-    AC_MSG_RESULT(yes)
+       squid_cv_gnu_atomics=yes
 ],[
-    AC_MSG_RESULT(no)
-],[ AC_MSG_RESULT(cross-compiler cant tell)
+       squid_cv_gnu_atomics=no
+])
 ])
+SQUID_DEFINE_BOOL(HAVE_ATOMIC_OPS,${squid_cv_gnu_atomics:=yes},[Define to 1 if you have GCC __sync_add_and_fetch() and such])
 
 AC_ARG_ENABLE(debug-cbdata,
   AS_HELP_STRING([--enable-debug-cbdata],