Bug 39114

Summary:	autoconf check for LTO ability
Product:	cairo	Reporter:	Marcus Meissner <meissner>
Component:	general	Assignee:	Carl Worth <cworth>
Status:	RESOLVED FIXED	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	medium
Version:	1.10.2
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	cairo-check-lto.patch

Description Marcus Meissner 2011-07-10 07:16:27 UTC

Created attachment 48934 [details] [review]
cairo-check-lto.patch

Some setups accept -flto, but produce unlinkable binaries.

So test to link (and not just to compile) -flto before using it.

Comment 1 Chris Wilson 2012-04-14 06:50:13 UTC

commit d486ea30f1a58640a1178de74f705a73845b1cda
Author: Marcus Meissner <meissner@suse.de>
Date:   Sat Apr 14 14:47:02 2012 +0100

    configure: Conditionally include -flto
    
    As some systems fail to create working binaries with when linked with
    lto, perform a check during configure.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=39114

Comment 2 Uli Schlachter 2012-10-20 18:34:19 UTC

Uhm, how did you test this patch? To me, it looks like this patch doesn't actually do anything, because AC_TRY_LINK() does not use MAYBE_WARN, does it?

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