[Mesa-dev] [PATCH] configure: simplify visibility compiler flag detection

[Alan Coopersmith]

On 03/ 1/15 10:57 AM, Emil Velikov wrote:
> On 01/03/15 18:30, Matt Turner wrote:
>> On Sun, Mar 1, 2015 at 6:09 AM, Marc Dietrich <marvin24 at gmx.de> wrote:
>>> This patch simplifies the visibility compiler flag detection in configure and
>>> makes it more generic to also support compilers other than gcc.
>>
>> This simplification relies on the assumption that compilers support
>> -fvisibility=... if and only if they support
>> attribute(visibility("...")).
>>
> Hmm you're correct. I've naively assumed they both go hand in hand.

The latest Solaris Studio compilers support attribute(visibility), but
not -fvisibility.  The absolute latest (12.4, released a few months back)
also support the clang has_attribute() extension for checking what's
supported (which is one of the reasons it's used in the X11/Xfuncproto.h
header in xproto 7.0.27 & later).

https://docs.oracle.com/cd/E37069_01/html/E37074/gjzke.html
https://docs.oracle.com/cd/E37069_01/html/E37074/gopqx.html
http://cgit.freedesktop.org/xorg/proto/x11proto/commit/?id=ffd4a13042d24cb5c913207585191801a9a1603e

-- 
	-Alan Coopersmith-              alan.coopersmith at oracle.com
	 Oracle Solaris Engineering - http://blogs.oracle.com/alanc