turn -Werror=null-dereference into a warning
There is unfortunately no way to suppres this witha pragma,
and gcc 9 uncovers quite a few new instaces with enabled LTO that can't/won't be fixed
Related: OS#4123
Change-Id: I571a85b6ea53af7661248afd84e61cf34b7b5641
diff --git a/configure.ac b/configure.ac
index cdee90c..694a9a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -117,7 +117,7 @@
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=memset-transposed-args], [CFLAGS="$CFLAGS -Werror=memset-transposed-args"])
-AX_CHECK_COMPILE_FLAG([-Werror=null-dereference], [CFLAGS="$CFLAGS -Werror=null-dereference"])
+AX_CHECK_COMPILE_FLAG([-Wnull-dereference], [CFLAGS="$CFLAGS -Wnull-dereference"])
AX_CHECK_COMPILE_FLAG([-Werror=sizeof-array-argument], [CFLAGS="$CFLAGS -Werror=sizeof-array-argument"])
AX_CHECK_COMPILE_FLAG([-Werror=sizeof-pointer-memaccess], [CFLAGS="$CFLAGS -Werror=sizeof-pointer-memaccess"])