package/mariadb: work around gcc bug 68485

With Microblaze Gcc version <= 12.x the build fails due to gcc bug
68485: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68485. The bug
show up when building mariadb with optimization but not when building
with -O0. To work around this, if BR2_TOOLCHAIN_HAS_GCC_BUG_68458=y,
we force using -O0.

Fixes:
http://autobuild.buildroot.net/results/9b5/9b5dce4958b602c80140440addb1f072332e53c2/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 4900fc717cea67a6e2692c714377d27093a5f76a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mariadb/mariadb.mk

@@ -82,6 +82,10 @@ ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 MARIADB_CXXFLAGS += -latomic
 endif
 
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_68485),y)
+MARIADB_CXXFLAGS += -O0
+endif
+
 MARIADB_CONF_OPTS += \
 	-DCMAKE_CXX_FLAGS="$(MARIADB_CXXFLAGS)" \
 	-DINSTALL_DOCDIR=share/doc/mariadb-$(MARIADB_VERSION) \