I tested it on x86_64, this should be tested on other arches before
merging, namely to make sure it catches GCC version below 4.4 on ARM.
Signed-off-by: Alexandre Montplaisir <alexandre.montplai...@gmail.com>
---
configure.ac | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/configure.ac b/configure.ac
index 0311246..d49666d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,22 @@ AS_IF([test "$host_cpu" = "armv7l"],[
CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
])
+# Check for GCC's __sync_* atomic operations.
+# Those are only available with GCC 4.1+ on most architectures but
+# require GCC 4.4+ on ARM.
+AC_MSG_CHECKING([for GCC atomic builtins])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[
+ int i, x = 0;
+ i = __sync_add_and_fetch(&x, 1);
+ ]])
+],[
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+ AC_MSG_ERROR([cannot find the __sync_* atomic functions.
+Please upgrade your version of GCC. GCC 4.4 or above is required on ARM.])
+])
+
# ARM-specific checks
AS_IF([test "x$ARCHTYPE" = "xarm"],[
AC_MSG_CHECKING([for dmb instruction])
--
1.7.7.3
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