all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
* bug#24290: ImageMagick optimized for the host processor type on x86_64 and i686
@ 2016-08-23  2:00 Leo Famulari
  2016-08-23  2:40 ` bug#24290: [PATCH 0/1] Potential solution Leo Famulari
  0 siblings, 1 reply; 6+ messages in thread
From: Leo Famulari @ 2016-08-23  2:00 UTC (permalink / raw)
  To: 24290

When building ImageMagick on i686 and x86_64, the '-mtune' GCC option
[0] is automatically set to optimize the output for the host processor
[1].

My understand of the GCC documentation is that the binaries will still
run on other processor types, which is why we haven't noticed any
related problems with ImageMagick so far.

But, this definitely makes the ImageMagick package non-reproducible.

Potential solutions:

* Set '-mtune=generic' when building on x86_64 and i686.
* Patch the build system to not try setting this flag at all. I'm not
sure how to achieve this, but I'm sure it's possible.
* Your great idea here :)

These are the two files that contain the string '-mtune' in the
ImageMagick source tree:

http://git.imagemagick.org/repos/ImageMagick/blob/ImageMagick-6/m4/ax_gcc_archflag.m4

I recommend *not* opening this file in your browser. It's very long and
might crash your browser. Try cloning the Git repo instead.
hXXp://git.imagemagick.org/repos/ImageMagick/blob/ImageMagick-6/configure

[0]
https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/i386-and-x86-64-Options.html#i386-and-x86-64-Options

[1]
http://hydra.gnu.org/build/1441619/log#line-2626
[...]
checking whether C compiler accepts -mtune=haswell... yes
checking for gcc architecture flag... -mtune=haswell
[...]

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2016-08-24 20:01 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-08-23  2:00 bug#24290: ImageMagick optimized for the host processor type on x86_64 and i686 Leo Famulari
2016-08-23  2:40 ` bug#24290: [PATCH 0/1] Potential solution Leo Famulari
2016-08-23  2:40   ` bug#24290: [PATCH 1/1] gnu: imagemagick: Don't build with processor-specific optimizations Leo Famulari
2016-08-23  4:53     ` Eric Bavier
2016-08-23 16:45       ` Leo Famulari
2016-08-24 20:00       ` Leo Famulari

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.