The -static-libstdc++ option was added to g++ in the gcc 4.5 release.
The Go frontend wants to use it when linking, so that the Go frontend is
independent of the installed libstdc++.so.  This is particularly useful
when bootstrapping, and is generally desirable as it permits moving the
compiler around.

This patch to gcc/configure.ac checks whether $(CXX) supports
-static-libstdc++, and sets a variable in Makefile.in.  This is not used
yet, but it will be used by the Go frontend when it goes in.

Bootstrapped on x86_64-unknown-linux-gnu.  OK for mainline?

Ian


2010-11-02  Ian Lance Taylor  <iant@google.com>

	* configure.ac: Set and substitute STATIC_LIBSTDCXX.
	* Makefile.in (STATIC_LIBSTDCXX): New variable.
	* configure: Rebuild.