introduce option to enable setjump()/longjump() based C++ exceptions (#9185, patch from David Kuehling via Qi hardware)

SVN-Revision: 27261

toolchain/gcc/Config.in

@@ -66,6 +66,15 @@ config TLS_SUPPORT
 	help
 	    Enable Thread-local storage support
 
+config SJLJ_EXCEPTIONS
+	bool
+	prompt "Use setjump()/longjump() exceptions" if TOOLCHAINOPTS
+	default n
+	help
+	    Use old setjump()/longjump() exceptions instead of the newer
+	    frame unwinding exceptions handling routines.  Warning: increases
+	    code size and runtime memory usage.
+
 config INSTALL_LIBSTDCPP
 	bool
 	prompt "Build/install c++ compiler and libstdc++?" if TOOLCHAINOPTS

toolchain/gcc/final/Makefile

@@ -22,6 +22,11 @@ else
 	--disable-tls
 endif
 
+ifneq ($(CONFIG_SJLJ_EXCEPTIONS),)
+  GCC_CONFIGURE += \
+	--enable-sjlj-exceptions
+endif
+
 define Host/Configure
 	mkdir -p $(GCC_BUILD_DIR) $(TOOLCHAIN_DIR)/$(REAL_GNU_TARGET_NAME)
 	# Important!  Required for limits.h to be fixed.