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[PATCH] Support using -flto with libstdc++ testsuite

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Tue, 2 Aug 2016 10:40:36 +0100
Subject: [PATCH] Support using -flto with libstdc++ testsuite
Authentication-results: sourceware.org; auth=none

Richi noticed that using -flto in the testsuite fails badly. It turns
out to be because the support files in libtestc++.a get built with
-flto, but then ar and ranlib don't know what to do with those LTO
objects.

We investigated how to pass the LTO plugin to ar and ranlib but the
simplest solution is to not use LTO for libtestc++.a, as done by this
patch.

	* testsuite/lib/libstdc++.exp (v3-build_support): Add -fno-lto to
	additional flags for compiling libtestc++.a objects.

Tested x86_64-linux, committing to trunk, gcc-6-branch, and gcc-5-branch.

Attachment: patch.txt
Description: Text document

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