This backport contains 1 patch from gcc main stream tree.
The commit id of these patchs list as following in the order of time.

0001-Bump-BASE-VER-to-9.3.1.patch
9f26e5863a75744bbee1479792ecae084a3ceb20

diff -Nurp a/gcc/BASE-VER b/gcc/BASE-VER
--- a/gcc/BASE-VER	2020-08-19 10:47:14.100000000 +0800
+++ b/gcc/BASE-VER	2020-08-19 10:32:30.380000000 +0800
@@ -1 +1 @@
-9.3.0
+9.3.1
diff -Nurp a/gcc/Makefile.in b/gcc/Makefile.in
--- a/gcc/Makefile.in	2020-08-19 10:32:45.528000000 +0800
+++ b/gcc/Makefile.in	2020-08-19 10:34:24.968000000 +0800
@@ -885,8 +885,7 @@ PATCHLEVEL_c := \
 # significant - do not remove it.
 BASEVER_s   := "\"$(BASEVER_c)\""
 DEVPHASE_s  := "\"$(if $(DEVPHASE_c), ($(DEVPHASE_c)))\""
-DATESTAMP_s := \
-  "\"$(if $(DEVPHASE_c)$(filter-out 0,$(PATCHLEVEL_c)), $(DATESTAMP_c))\""
+DATESTAMP_s := "\"\""
 PKGVERSION_s:= "\"@PKGVERSION@\""
 BUGURL_s    := "\"@REPORT_BUGS_TO@\""