Subject: [PATCH] gnu: libffi: Add unreleased patch to fix float128 on powerpc64le.

From: dftxbs3e <[email-masked]>
Date: Sat, 21 Nov 2020 17:24:30 +0100

Hello,

Merging this and https://issues.guix.gnu.org/38459 onto master allows
to successfully build bootstrap-tarballs for powerpc64le-linux-gnu
using the command:

$ guix build --target=powerpc64le-linux-gnu bootstrap-tarballs

This patch can be removed when libffi releases the next version
(probably 3.4).

Thank you
From e195e9e9fe0409dd4b76cac87244cb2b5d7636e0 Mon Sep 17 00:00:00 2001
From: John Doe <[email-masked]>
Date: Sat, 21 Nov 2020 17:06:07 +0100
Subject: [PATCH] gnu: libffi: Add unreleased patch to fix float128 on
 powerpc64le.

Patch fetched from https://github.com/libffi/libffi/pull/561.patch
---
 gnu/local.mk                                  |  3 +-
 gnu/packages/libffi.scm                       |  1 +
 .../patches/libffi-float128-powerpc64le.patch | 58 +++++++++++++++++++
 3 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/libffi-float128-powerpc64le.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 35369063f1..f4a43982cc 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1731,7 +1731,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/xsane-support-ipv6.patch			\
   %D%/packages/patches/xsane-tighten-default-umask.patch	\
   %D%/packages/patches/yggdrasil-extra-config.patch	\
-  %D%/packages/patches/zziplib-CVE-2018-16548.patch
+  %D%/packages/patches/zziplib-CVE-2018-16548.patch	\
+  %D%/packages/patches/libffi-float128-powerpc64le.patch
 
 MISC_DISTRO_FILES =				\
   %D%/packages/ld-wrapper.in
diff --git a/gnu/packages/libffi.scm b/gnu/packages/libffi.scm
index d324892330..f6e2efabe0 100644
--- a/gnu/packages/libffi.scm
+++ b/gnu/packages/libffi.scm
@@ -48,6 +48,7 @@
               (uri
                (string-append "ftp://sourceware.org/pub/libffi/"
                               name "-" version ".tar.gz"))
+	      (patches (search-patches "libffi-float128-powerpc64le.patch"))
               (sha256
                (base32
                 "0mi0cpf8aa40ljjmzxb7im6dbj45bb0kllcd09xgmp834y9agyvj"))))
diff --git a/gnu/packages/patches/libffi-float128-powerpc64le.patch b/gnu/packages/patches/libffi-float128-powerpc64le.patch
new file mode 100644
index 0000000000..4fd32b0102
--- /dev/null
+++ b/gnu/packages/patches/libffi-float128-powerpc64le.patch
@@ -0,0 +1,58 @@
+From de93adfb6f48100946bba2c3abad2a77a0cfde0b Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <[email-masked]>
+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
+
+Signed-off-by: Fabrice Fontaine <[email-masked]>
+Signed-off-by: Andrew Geissler <[email-masked]>
+---
+ 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 8e2f2f0e..960a5c42 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;
-- 
2.29.2