workaround a gcc-11 on mips64* architectures by passing -O3; patch by YunQiang Su; Closes: #1000435

debian/changelog

+matplotlib (3.5.1-2) UNRELEASED; urgency=medium
+
+  * debian/rules
+    - workaround a gcc-11 on mips64* architectures by passing -O3; patch by
+      YunQiang Su; Closes: #1000435
+
+ -- Sandro Tosi <morph@debian.org>  Tue, 25 Jan 2022 16:54:16 -0500
+
 matplotlib (3.5.1-1) unstable; urgency=medium
 
   * New upstream release

debian/rules

@@ -11,6 +11,14 @@ pdata := python-matplotlib-data
 DEB_BUILD_OPTIONS += --no-parallel
 
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+# https://bugs.debian.org/1000435
+# it is due to a bug of gcc-11
+ifneq (,$(filter $(DEB_HOST_ARCH), mips64 mips64el mips64r6 mips64r6el))
+  DEB_CFLAGS_MAINT_APPEND += -O3
+  DEB_CXXFLAGS_MAINT_APPEND += -O3
+endif
+
 DPKG_EXPORT_BUILDFLAGS = 1
 include /usr/share/dpkg/buildflags.mk