darktable: finally problem understood and fixed, disable AVX instructions.

gcc-4.7.3 generates AVX instructions with -mtune=generic on Intel CPUs
supporting the AVX instruction set.

srcpkgs/darktable/patches/mmsetflush-gcc473-mtune-generic.patch

@@ -1,16 +0,0 @@
-Comment _MM_SET_FLUSH_ZERO_MODE for now.
-
-gcc-4.7.3 with -mtune=generic uses STMXCSR/VSTMXCSR instructions which are
-only available in Sandy Bridge CPUs, thus causes a SIGILL on AMD CPUs.
-
---- src/common/darktable.c.orig	2014-05-08 11:42:15.844554271 +0200
-+++ src/common/darktable.c	2014-05-08 11:43:00.724288778 +0200
-@@ -363,7 +363,7 @@ int dt_init(int argc, char *argv[], cons
- #endif
- 
-   // make everything go a lot faster.
--  _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
-+  //_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
- #if !defined __APPLE__ && !defined __WIN32__
-   _dt_sigsegv_old_handler = signal(SIGSEGV,&_dt_sigsegv_handler);
- #endif

srcpkgs/darktable/template

@@ -1,7 +1,7 @@
 # Template file for 'darktable'
 pkgname=darktable
 version=1.4.2
-revision=5
+revision=6
 build_style=cmake
 maintainer="Carlo Dormeletti <carlo.dormeletti@email.it>"
 homepage="http://www.darktable.org/"
@@ -17,6 +17,10 @@ makedepends="gtk+-devel glib-devel exiv2-devel lcms2-devel
 distfiles="${SOURCEFORGE_SITE}/${pkgname}/1.4/${pkgname}-${version}.tar.xz"
 checksum="c1311a6e336007b85d21647652ebec3e26840248a968eab04ab5f0a56c2e0709"
 
+# Do not generate AVX instructions, which might happen with -mtune=generic on
+# Intel CPUs. This avoids the vstmxcsr instruction which is AVX specific.
+CFLAGS="-mno-avx -mno-avx2"
+
 post_install() {
 	mv ${DESTDIR}/usr/lib/darktable/libdarktable.so ${DESTDIR}/usr/lib/
 }