Add configure check for _Static_assert()
Commit 8efede20ef ("Use _Static_assert") introduced the usage of
_Static_assert(). However, _Static_assert() is a fairly new thing,
since it was introduced only in gcc 4.6. In order to support older
compilers, this patch adds a configure.in test that checks whether
_Static_assert() is usable or not, and adjust the behavior of the
assert_cc() macro accordingly.
diff --git a/configure.ac b/configure.ac
index 40e54cf..a192c81 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,6 +52,12 @@
# Check kernel headers
AC_CHECK_HEADERS_ONCE([linux/module.h])
+AC_MSG_CHECKING([whether _Static_assert() is supported])
+AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE([[_Static_assert(1, "Test");]])],
+ [AC_DEFINE([HAVE_STATIC_ASSERT], [1], [Define if _Static_assert() is available])
+ AC_MSG_RESULT([yes])],
+ [AC_MSG_RESULT([no])])
#####################################################################
# --with-
