fix build on epel-6-i386

Don't try to compile AVX intrinsics if SSE compilation failed.

elpa-no-avx.patch

@@ -1,6 +1,6 @@
 diff -up mpich/configure.ac.avx mpich/configure.ac
---- mpich/configure.ac.avx	2015-03-20 15:26:06.535080683 +0100
+--- mpich/configure.ac.avx	2015-05-05 11:06:33.132304515 +0200
-+++ mpich/configure.ac	2015-03-20 15:26:06.536080688 +0100
++++ mpich/configure.ac	2015-05-05 11:06:33.137304689 +0200
 @@ -213,6 +213,11 @@ dnl first test failed: try again after u
    [can_compile_avx=yes],
    [can_compile_avx=no]
@@ -22,9 +22,9 @@ diff -up mpich/configure.ac.avx mpich/configure.ac
  rm -rf modules/ .fortran_dependencies/
  mkdir modules
 diff -up mpich/configure.avx mpich/configure
---- mpich/configure.avx	2015-03-18 10:49:42.000000000 +0100
+--- mpich/configure.avx	2015-05-05 11:06:33.136304654 +0200
-+++ mpich/configure	2015-05-04 12:03:18.861651356 +0200
++++ mpich/configure	2015-05-05 11:20:57.544768442 +0200
-@@ -638,6 +638,7 @@
+@@ -638,6 +638,7 @@ LTLIBOBJS
  LIBOBJS
  PKG_CONFIG_FILE
  SUFFIX
@@ -32,7 +32,24 @@ diff -up mpich/configure.avx mpich/configure
  OPENMP_LDFLAGS
  OPENMP_CFLAGS
  with_amd_bulldozer_kernel
-@@ -6076,6 +5965,11 @@
+@@ -6049,14 +6050,14 @@ $as_echo_n "checking whether we can comp
+   }
+ 
+ _ACEOF
+-if ac_fn_c_try_compile "$LINENO"; then :
++if test x"${can_compile_sse}" = x"yes" && ac_fn_c_try_compile "$LINENO" ; then
+   can_compile_avx=yes
+ else
+   can_compile_avx=no
+ 
+ fi
+ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+- if test x"${can_compile_avx}" = x"no"; then
++ if test x"${can_compile_sse}" = x"yes" && test x"${can_compile_avx}" = x"no"; then
+  CFLAGS="$CFLAGS -mavx"
+  CXXFLAGS="$CXXFLAGS -mavx"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+@@ -6076,6 +6077,11 @@ else
  
  fi
  rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -45,8 +62,8 @@ diff -up mpich/configure.avx mpich/configure
  { $as_echo "$as_me:${as_lineno-$LINENO}: result: ${can_compile_avx}" >&5
  $as_echo "${can_compile_avx}" >&6; }
 diff -up mpich/Makefile.am.avx mpich/Makefile.am
---- mpich/Makefile.am.avx	2015-03-20 15:26:06.534080677 +0100
+--- mpich/Makefile.am.avx	2015-05-05 11:06:33.131304480 +0200
-+++ mpich/Makefile.am	2015-03-20 15:31:55.590089898 +0100
++++ mpich/Makefile.am	2015-05-05 11:06:33.141304828 +0200
 @@ -8,6 +8,8 @@ AM_LDFLAGS = $(SCALAPACK_LDFLAGS)
  # libelpa
  lib_LTLIBRARIES = libelpa@SUFFIX@.la
@@ -57,9 +74,9 @@ diff -up mpich/Makefile.am.avx mpich/Makefile.am
  libelpa@SUFFIX@_la_SOURCES = src/elpa_utilities.F90 \
  	                     src/elpa1.F90 \
 diff -up mpich/Makefile.in.avx mpich/Makefile.in
---- mpich/Makefile.in.avx	2015-03-18 10:49:43.000000000 +0100
+--- mpich/Makefile.in.avx	2015-05-05 11:06:33.131304480 +0200
-+++ mpich/Makefile.in	2015-05-04 12:03:19.989659664 +0200
++++ mpich/Makefile.in	2015-05-05 11:06:33.141304828 +0200
-@@ -774,6 +764,7 @@
+@@ -774,6 +774,7 @@ AR = @AR@
  AUTOCONF = @AUTOCONF@
  AUTOHEADER = @AUTOHEADER@
  AUTOMAKE = @AUTOMAKE@
@@ -67,7 +84,7 @@ diff -up mpich/Makefile.in.avx mpich/Makefile.in
  AWK = @AWK@
  CC = @CC@
  CCAS = @CCAS@
-@@ -918,6 +909,8 @@
+@@ -918,6 +919,8 @@ AM_LDFLAGS = $(SCALAPACK_LDFLAGS)
  # libelpa
  lib_LTLIBRARIES = libelpa@SUFFIX@.la
  libelpa@SUFFIX@_la_LINK = $(FCLINK) $(AM_LDFLAGS) -version-info $(ELPA_SO_VERSION) -lstdc++