gcc: update to version 7.4.0, Add config options

for coping libc.a, libpthread.a and libstdc++ to target.
Add config option to eliminate need for -lstdc++ and -lgcc_pic
switches when linking statically

Signed-off-by: Noble Pepper <noblepepper@gmail.com>

devel/gcc/Config.in

@@ -0,0 +1,34 @@
+# gcc library configuration
+menu "Libraries"
+	depends on PACKAGE_gcc
+	config INCLUDE_STATIC_LIBC
+		bool "Include static libc on target"
+		help
+			Copies libc.a to target device
+			Increases the size of an already
+			very large package
+		default n
+	config INCLUDE_STATIC_LIBPTHREAD
+		bool "Include static libptread on target"
+		help
+			Copies libpthread.a to target device
+			Increases the size of an already
+			very large package
+		default n
+	config INCLUDE_STATIC_LIBSTDC
+		bool "Include static libstdc++ on target"
+		help
+			Copies libstdc++.a to target device
+			Increases the size of an already
+			very large package
+		default n
+	config INCLUDE_STATIC_LINK_SPEC
+		depends on INCLUDE_STATIC_LIBSTDC
+		bool "Generate spec file for easy static c++ linking on target"
+		help
+			Creates a spec file for gcc to eliminate the need for
+			-lstdc++, libgcc_pic and -static-libstdc flags when
+			statically linking c++ programs
+		default n
+endmenu
+