toolchain/gcc: GCC12 sync upstream (coolsnowwolf#10080)

Author: Beginner-Go

toolchain/gcc/common.mk

@@ -191,6 +191,12 @@ define Host/SetToolchainInfo
 	$(SED) 's,GCC_VERSION=.*,GCC_VERSION=$(GCC_VERSION),' $(TOOLCHAIN_DIR)/info.mk
 endef
 
+ifdef CONFIG_GCC_USE_VERSION_12
+	GCC_VERSION_FILE:=gcc/genversion.cc
+else
+	GCC_VERSION_FILE:=gcc/version.c
+endif
+
 ifneq ($(GCC_PREPARE),)
   define Host/Prepare
 	$(call Host/SetToolchainInfo)
@@ -199,8 +205,7 @@ ifneq ($(GCC_PREPARE),)
 	$(CP) $(SCRIPT_DIR)/config.{guess,sub} $(HOST_SOURCE_DIR)/
 	$(SED) 's,^MULTILIB_OSDIRNAMES,# MULTILIB_OSDIRNAMES,' $(HOST_SOURCE_DIR)/gcc/config/*/t-*
 	$(SED) 'd' $(HOST_SOURCE_DIR)/gcc/DEV-PHASE
-	$(SED) 's, DATESTAMP,,' $(HOST_SOURCE_DIR)/gcc/version.c
-	#(cd $(HOST_SOURCE_DIR)/libstdc++-v3; autoconf;);
+	$(SED) 's, DATESTAMP,,' $(HOST_SOURCE_DIR)/$(GCC_VERSION_FILE)
 	$(SED) 's,gcc_no_link=yes,gcc_no_link=no,' $(HOST_SOURCE_DIR)/libstdc++-v3/configure
 	mkdir -p $(GCC_BUILD_DIR)
   endef