configure.ac: Use AX_GCC_BUILTIN to check availability of __builtin_bswap32 v2
v2:
- Remove unnecessary AC_SUBST
Reviewed-by: Matt Turner <mattst88@gmail.com>
diff --git a/configure.ac b/configure.ac
index 24ffc54..4cfdedb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,6 +119,10 @@
GEN_ASM_OFFSETS=yes
fi
fi
+
+dnl Check for compiler builtins
+AX_GCC_BUILTIN([__builtin_bswap32])
+
AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes)
dnl Make sure the pkg-config macros are defined