configure.ac: fix maybe-uninitialized for clang
Clang and gcc have different names for this, but the check fails without
-Werror since clang only warns about unknown args.
The previous check led to a lot of "unknown arg" spam while compiling
with clang.
Change-Id: Iad6c16beed26d5fe8952d7d5a79a93845c391b48
diff --git a/configure.ac b/configure.ac
index 64e2c04..192c012 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,7 +90,8 @@
dnl Checks for typedefs, structures and compiler characteristics
AX_CHECK_COMPILE_FLAG([-Werror=implicit], [CFLAGS="$CFLAGS -Werror=implicit"])
-AX_CHECK_COMPILE_FLAG([-Werror=maybe-uninitialized], [CFLAGS="$CFLAGS -Werror=maybe-uninitialized"])
+AX_CHECK_COMPILE_FLAG([-Werror=maybe-uninitialized], [CFLAGS="$CFLAGS -Werror=maybe-uninitialized"],,[-Werror])
+AX_CHECK_COMPILE_FLAG([-Werror=sometimes-uninitialized], [CFLAGS="$CFLAGS -Werror=sometimes-uninitialized"],,[-Werror])
AX_CHECK_COMPILE_FLAG([-Werror=memset-transposed-args], [CFLAGS="$CFLAGS -Werror=memset-transposed-args"])
AX_CHECK_COMPILE_FLAG([-Wnull-dereference], [CFLAGS="$CFLAGS -Wnull-dereference"])
AX_CHECK_COMPILE_FLAG([-Werror=sizeof-array-argument], [CFLAGS="$CFLAGS -Werror=sizeof-array-argument"])