https://bugs.gentoo.org/417179
https://github.com/atgreen/libffi/issues/21

From bff052d9cd5be41ba9e47c76114054af487d3c30 Mon Sep 17 00:00:00 2001
From: Anthony Green <green@moxielogic.com>
Date: Fri, 11 Jan 2013 10:24:32 -0500
Subject: [PATCH] 32-bit x86 fix and more

---
 ChangeLog          |    8 ++++++++
 README             |    2 ++
 configure          |   43 +++++--------------------------------------
 configure.ac       |    6 +++---
 m4/ax_cc_maxopt.m4 |    3 ++-
 5 files changed, 20 insertions(+), 42 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5ca32fd..32ec7c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -334,10 +334,10 @@ fi
 if test x$TARGET = xX86 || test x$TARGET = xX86_WIN32 || test x$TARGET = xX86_64; then
     AC_CACHE_CHECK([assembler supports pc related relocs],
 	libffi_cv_as_x86_pcrel, [
-	libffi_cv_as_x86_pcrel=yes
+	libffi_cv_as_x86_pcrel=no
 	echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
-	if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
-	    libffi_cv_as_x86_pcrel=no
+	if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
+	    libffi_cv_as_x86_pcrel=yes
 	fi
 	])
     if test "x$libffi_cv_as_x86_pcrel" = xyes; then
diff --git a/m4/ax_cc_maxopt.m4 b/m4/ax_cc_maxopt.m4
index f5f7517..62e3b53 100644
--- a/m4/ax_cc_maxopt.m4
+++ b/m4/ax_cc_maxopt.m4
@@ -141,7 +141,8 @@ if test "$ac_test_CFLAGS" != "set"; then
      CFLAGS="-O3 -fomit-frame-pointer"
 
      # -malign-double for x86 systems
-     AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
+     # LIBFFI -- DON'T DO THIS - CHANGES ABI
+     # AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
 
      #  -fstrict-aliasing for gcc-2.95+
      AX_CHECK_COMPILE_FLAG(-fstrict-aliasing,
diff --git a/configure b/configure
index 95d950b..41bde69 100755
--- a/configure
+++ b/configure
@@ -12426,41 +12426,8 @@ $as_echo "$icc_archflag" >&6; }
      CFLAGS="-O3 -fomit-frame-pointer"
 
      # -malign-double for x86 systems
-     { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -malign-double" >&5
-$as_echo_n "checking whether C compiler accepts -malign-double... " >&6; }
-if ${ax_cv_check_cflags___malign_double+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-  ax_check_save_flags=$CFLAGS
-  CFLAGS="$CFLAGS  -malign-double"
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main ()
-{
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ax_cv_check_cflags___malign_double=yes
-else
-  ax_cv_check_cflags___malign_double=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-  CFLAGS=$ax_check_save_flags
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___malign_double" >&5
-$as_echo "$ax_cv_check_cflags___malign_double" >&6; }
-if test x"$ax_cv_check_cflags___malign_double" = xyes; then :
-  CFLAGS="$CFLAGS -malign-double"
-else
-  :
-fi
-
+     # LIBFFI -- DON'T DO THIS - CHANGES ABI
+     # AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
 
      #  -fstrict-aliasing for gcc-2.95+
      { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fstrict-aliasing" >&5
@@ -14480,10 +14447,10 @@ if ${libffi_cv_as_x86_pcrel+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
-	libffi_cv_as_x86_pcrel=yes
+	libffi_cv_as_x86_pcrel=no
 	echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
-	if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
-	    libffi_cv_as_x86_pcrel=no
+	if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
+	    libffi_cv_as_x86_pcrel=yes
 	fi
 
 fi
-- 
1.7.10