From 31b6b6bc14197cd4183bdbd311fddeb36b5ae100 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
Date: Sat, 19 Sep 2015 22:53:29 +0200
Subject: [PATCH] Fix use of compact eh frames on MIPS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Newer MIPS toolchains use a different (compact) eh_frame format.
libffi don't like them, so we have to switch to the older format.

This patch add -mno-compact-eh to CFLAGS when compiling for
Mips and compiler support it.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
[unfuzz for 3.2.1]
Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
---
 configure.ac | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index a7bf5ee..36cd0d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -469,6 +469,16 @@ esac
 AM_CONDITIONAL(FFI_EXEC_TRAMPOLINE_TABLE, test x$FFI_EXEC_TRAMPOLINE_TABLE = x1)
 AC_SUBST(FFI_EXEC_TRAMPOLINE_TABLE)
 
+if test x$TARGET = xMIPS; then
+    save_CFLAGS="$CFLAGS"
+    CFLAGS=-mno-compact-eh
+    AC_MSG_CHECKING([whether the C compiler needs -mno-compact-eh])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+                      [AC_MSG_RESULT([yes])]; [save_CFLAGS="$save_CFLAGS -mno-compact-eh"],
+                      [AC_MSG_RESULT([no])])
+    CFLAGS="$save_CFLAGS"
+fi
+
 if test x$TARGET = xX86_64; then
     AC_CACHE_CHECK([toolchain supports unwind section type],
 	libffi_cv_as_x86_64_unwind_section_type, [
-- 
2.5.3