Bug 716860

Summary:	x11-libs/libX11 is compiled without the suport for shared mem extension module
Product:	Gentoo Linux	Reporter:	brankob
Component:	Current packages	Assignee:	Gentoo X packagers <x11>
Status:	RESOLVED INVALID
Severity:	normal	CC:	brankob, jstein
Priority:	Normal	Keywords:	PATCH
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	tweaked ebuild- added libXext dependency and shm flag

Description brankob 2020-04-10 04:37:59 UTC

Mesa performance tips ( https://www.mesa3d.org/perf.html ) recommends compiling libX11 with MIT shared memory support for best openGL performance, yet this seems to be missing in ebuild. Is there some kind of securtiy problem with this ?

I've modified exisitng ebuild. I've adde shm USE flag and conditinal dependency to libXext. PAckage seesm to build fine and uses added define and libXext library during make.

I'll attach the ebuild...


 

Reproducible: Always

Comment 1 brankob 2020-04-10 04:39:58 UTC

Created attachment 631690 [details]
tweaked ebuild- added libXext dependency and shm flag

Comment 2 Matt Turner gentoo-dev

2020-06-15 00:30:08 UTC

Thanks for the report.

That documentation is very out of date. SHM support is enabled automatically by configure.ac:

AC_CHECK_FUNC([shmat], AC_DEFINE(HAS_SHM,1,[Has shm*() functions]))

which detects it on my system:

> checking for shmat... yes

So, nothing to do here. :)