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libgo patch committed: Support -buildmode=c-archive

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "gofrontend-dev at googlegroups dot com" <gofrontend-dev at googlegroups dot com>
Date: Wed, 29 Apr 2015 14:39:26 -0700
Subject: libgo patch committed: Support -buildmode=c-archive
Authentication-results: sourceware.org; auth=none

The upcoming Go 1.5 release of the gc compiler adds support for "go
build -buildmode=c-archive".  This can be used to build Go code into
an archive (a .a file) that can be linked with a non-Go program, such
that the non-Go program can call into Go code.  This patch adds
support for that to gccgo.

I'm going to commit this patch to the GCC 5 branch as well.  This will
permit the Go 1.5 go tool to be used with the GCC 5.2 and later.  That
way people won't have to wait for GCC 6.  This patch seems safe to me
and passes all my testing.

Bootstrapped and ran Go tests and gc cgo tests on
x86_64-unknown-linux-gnu.  Committed to mainline and GCC 5 branch.

Ian

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