Fix no-exception libstdc++

Was including the exception enabled version by default.

Fixing this saves ~6K flash and 4K RAM.

Makefile

@@ -8,7 +8,7 @@
 REL     := $(if $(REL),$(REL),1.0.0)
 SUBREL  := $(if $(SUBREL),$(SUBREL),testing)
 ARDUINO := $(if $(ARDUINO),$(ARDUINO),$(shell pwd)/arduino)
-GCC     := $(if $(GCC),$(GCC),10.2)
+GCC     := $(if $(GCC),$(GCC),10.3)
 
 # General constants
 PWD      := $(shell pwd)
@@ -486,11 +486,11 @@ clean: .cleaninst.LINUX.clean .cleaninst.LINUX32.clean .cleaninst.WIN32.clean .c
 .stage.%.libstdcpp-nox: .stage.%.libstdcpp
 	echo STAGE: $@
 	# We copy existing stdc, adjust the makefile, and build a single .a to save much time
+	cp $(ARCH)$(call ext,$@)/$(ARCH)/lib/thumb/libstdc++.a $(ARCH)$(call ext,$@)/$(ARCH)/lib/thumb/libstdc++-exc.a >> $(call log,$@) 2>&1
 	rm -rf $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3-nox > $(call log,$@) 2>&1
 	cp -a $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3 $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3-nox >> $(call log,$@) 2>&1
 	(cd $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3-nox; $(call setenv,$@); $(MAKE) clean; find . -name Makefile -exec sed -i 's/-free/-free -fno-exceptions/' \{\} \; ; $(MAKE)) >> $(call log,$@) 2>&1
-	cp $(ARCH)$(call ext,$@)/$(ARCH)/lib/thumb/libstdc++.a $(ARCH)$(call ext,$@)/$(ARCH)/lib/thumb/libstdc++-exc.a >> $(call log,$@) 2>&1
-	cp $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3-nox/src/.libs/libstdc++.a $(ARCH)$(call ext,$@)/$(ARCH)/lib/libstdc++.a >> $(call log,$@) 2>&1
+	cp $(call arena,$@)/$(GCC_DIR)/$(ARCH)/libstdc++-v3-nox/src/.libs/libstdc++.a $(ARCH)$(call ext,$@)/$(ARCH)/lib/thumb/libstdc++.a >> $(call log,$@) 2>&1
 	touch $@
 
 .stage.%.strip: .stage.%.libstdcpp-nox

README.md

@@ -4,7 +4,7 @@ Allows building Win32, Win64, OSX, Linux x86_64, ARM64 (aarch64) and Raspberry P
 
 ## Work In Progesss
 
-Builds work for GCC 9.3, and 10.x.  Others not fully tested but were building last time they were tried.
+Builds work for GCC 9.3, 10.x, and 12.1.  Others not fully tested but were building last time they were tried.
 
 ## Downloading GCC/etc. sources
 
@@ -18,7 +18,7 @@ to clone the GCC and libs needed to the repo/ directory.  This takes a while, so
 
 If you're only compiling natively, you can just clone this repo and run
 ````
-make GCC={9.3|10.2|10.3} REL=x.x.x SUBREL=x -jx  # I like -j32 on a 16-core server, adjust according to your CPU power
+make GCC={9.3|10.2|10.3|12.1} REL=x.x.x SUBREL=x -jx  # I like -j32 on a 16-core server, adjust according to your CPU power
 ````
 
 Note that to build a non-linux toolchain, you first need to build a linux chain in the directory.  This is because the cross compiler requires a local host executable gcc for the target architecture to build properly.
@@ -29,7 +29,7 @@ To build all architectures use the commands
 ````
 git clone https://github.com/earlephilhower/pico-quick-toolchain
 cd pico-quick-toolchain
-docker run --user $(id -u):$(id -g) --rm -v $(pwd):/workdir earlephilhower/gcc-cross-v6 bash -c "cd /workdir; make -j32 GCC={9.3|10.1|10.2|10.3} REL=2.5.0 SUBREL=3 all"
+docker run --user $(id -u):$(id -g) --rm -v $(pwd):/workdir earlephilhower/gcc-cross-v6 bash -c "cd /workdir; make -j32 GCC={9.3|10.1|10.2|10.3|12.1} REL=2.5.0 SUBREL=3 all"
 ````
 
 To make a draft release of the binaries:
@@ -41,7 +41,7 @@ You then promote the draft to a pre-release so it becomes visible and can then m
 
 Then to install the libraries and headers into the Arduino core (not including the toolchain exes) just
 ````
-make GCC={9.3|10.2|10.3} REL=2.5.0 SUBREL=3 install  (INSTALLBRANCH=xxx may be added to apply against a predefined branch other than master)
+make GCC={9.3|10.2|10.3|12.1} REL=2.5.0 SUBREL=3 install  (INSTALLBRANCH=xxx may be added to apply against a predefined branch other than master)
 <in Arduino dir>
 git commit -a
 ````