libffi: fix v3.3 compile on ppc64le

The latest released version of libffi no longer compiles on ppc64le
based machines. Some searching found a patch that fixed our issue but
had not been submitted upstream to libffi.

It has now been submitted upstream with this PR:
https://github.com/libffi/libffi/pull/561

(From OE-Core rev: 76001bd4ae1e4f153f3d670b19e9ccd39c9fc4ef)

Signed-off-by: Andrew Geissler <geissonator@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/libffi/libffi/0001-ffi_powerpc.h-fix-build-failure-with-powerpc7.patch

@@ -0,0 +1,62 @@
+From de93adfb6f48100946bba2c3abad2a77a0cfde0b Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 24 Nov 2019 09:52:01 +0100
+Subject: [PATCH] ffi_powerpc.h: fix build failure with powerpc7
+
+This is a patch pulled down from the following:
+https://github.com/buildroot/buildroot/blob/78926f610b1411b03464152472fd430012deb9ac/package/libffi/0004-ffi_powerpc.h-fix-build-failure-with-powerpc7.patch
+
+This issue is being hit on OpenBMC code when pulling the latest
+libffi tag and building on a P8 ppc64le machine. I verified this
+patch fixes the issue we are seeing.
+
+Below is the original commit message:
+
+Sicne commit 73dd43afc8a447ba98ea02e9aad4c6898dc77fb0, build on powerpc7
+fails on:
+
+In file included from ../src/powerpc/ffi.c:33:0:
+../src/powerpc/ffi_powerpc.h:61:9: error: '_Float128' is not supported on this target
+ typedef _Float128 float128;
+         ^~~~~~~~~
+
+Fix this build failure by checking for __HAVE_FLOAT128 before using
+_Float128, as _Float128 is enabled only on specific conditions, see
+output/host/powerpc64-buildroot-linux-gnu/sysroot/usr/include/bits/floatn.h:
+
+ /* Defined to 1 if the current compiler invocation provides a
+    floating-point type with the IEEE 754 binary128 format, and this glibc
+    includes corresponding *f128 interfaces for it.  */
+ #if defined _ARCH_PWR8 && defined __LITTLE_ENDIAN__ && (_CALL_ELF == 2) \
+     && defined __FLOAT128__ && !defined __NO_LONG_DOUBLE_MATH
+ # define __HAVE_FLOAT128 1
+ #else
+ # define __HAVE_FLOAT128 0
+ #endif
+
+Fixes:
+ - http://autobuild.buildroot.org/results/5c9dd8fb3b6a128882b6250f197c80232d8a3b53
+
+Upstream-Status: Submitted [https://github.com/libffi/libffi/pull/561]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
+---
+ src/powerpc/ffi_powerpc.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/powerpc/ffi_powerpc.h b/src/powerpc/ffi_powerpc.h
+index 8e2f2f0..960a5c4 100644
+--- a/src/powerpc/ffi_powerpc.h
++++ b/src/powerpc/ffi_powerpc.h
+@@ -57,7 +57,7 @@ typedef union
+   double d;
+ } ffi_dblfl;
+
+-#if defined(__FLOAT128_TYPE__)
++#if defined(__FLOAT128_TYPE__) && defined(__HAVE_FLOAT128)
+ typedef _Float128 float128;
+ #elif defined(__FLOAT128__)
+ typedef __float128 float128;
+--
+2.21.0 (Apple Git-122)
+

meta/recipes-support/libffi/libffi_3.3.bb

@@ -16,6 +16,7 @@ SRC_URI = "https://github.com/libffi/libffi/releases/download/v${PV}/${BPN}-${PV
            file://0001-powerpc-fix-build-failure-on-power7-and-older-532.patch \
            file://0001-Address-platforms-with-no-__int128.patch \
            file://0001-Address-platforms-with-no-__int128-part2.patch \
+           file://0001-ffi_powerpc.h-fix-build-failure-with-powerpc7.patch \
            "
 SRC_URI[md5sum] = "6313289e32f1d38a9df4770b014a2ca7"
 SRC_URI[sha256sum] = "72fba7922703ddfa7a028d513ac15a85c8d54c8d67f55fa5a4802885dc652056"