bug#61879: Patch

[Andreas Enge <andreas@enge.fr>]

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Hello,

attached is a new commit in old syntax, mixing both our commits.
I have confirmed that it does not change the gcc-11 build on x86_64 and i686.
But do we need "--force" for patching?

Could you maybe check again whether this builds gcc-11 on powerpc?

If yes, we can push it, and feel free to gexpify it in a separate commit.

Andreas


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From 9900f9e9b86550e7d336b04ad46fba088e28cbd6 Mon Sep 17 00:00:00 2001
From: Andreas Enge <andreas@enge.fr>
Date: Thu, 13 Apr 2023 11:46:47 +0200
Subject: [PATCH] gnu: gcc-11: Fix build on powerpc64le.

* gnu/packages/patches/gcc-11-libstdc++-powerpc.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register patch.
* gnu/packages/gcc.scm (make-libstdc++): Apply patch for gcc versions >= 11
and < 12 on ppc64le.

Co-authored-by: Christopher Baines <mail@cbaines.net>
---
 gnu/local.mk                                   |  1 +
 gnu/packages/gcc.scm                           | 11 ++++++++++-
 .../patches/gcc-11-libstdc++-powerpc.patch     | 18 ++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/gcc-11-libstdc++-powerpc.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index b07811f1cb..1255846462 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1184,6 +1184,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gcc-11-libstdc++-hurd-libpthread.patch   \
   %D%/packages/patches/gcc-12-cross-environment-variables.patch \
   %D%/packages/patches/gcc-10-tree-sra-union-handling.patch	\
+  %D%/packages/patches/gcc-11-libstdc++-powerpc.patch           \
   %D%/packages/patches/gcolor3-update-libportal-usage.patch	\
   %D%/packages/patches/gd-fix-tests-on-i686.patch		\
   %D%/packages/patches/gd-brect-bounds.patch			\
diff --git a/gnu/packages/gcc.scm b/gnu/packages/gcc.scm
index a511cdbc45..ae324219d3 100644
--- a/gnu/packages/gcc.scm
+++ b/gnu/packages/gcc.scm
@@ -2,7 +2,7 @@
 ;;; Copyright © 2012-2023 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014, 2015, 2016, 2017, 2019, 2021 Ricardo Wurmus <rekado@elephly.net>
-;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
+;;; Copyright © 2015, 2023 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2015-2018, 2020-2023 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2016 Carlos Sánchez de La Lama <csanchezdll@gmail.com>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
@@ -889,6 +889,15 @@ (define-public (make-libstdc++ gcc)
                                           ":")
                                          "\nAM_CXXFLAGS = ")))))))
                '())
+         ,@(let ((version (package-version gcc)))
+                (if (and (target-ppc64le?)
+                    (version>=? version "11")
+                    (not (version>=? version "12")))
+               `((add-after 'unpack 'patch-powerpc
+                   (lambda _
+                    (invoke "patch" "--force" "-p1" "-i"
+                            (search-patch "gcc-11-libstdc++-powerpc.patch")))))
+               '()))
          ;; Force rs6000 (i.e., powerpc) libdir to be /lib and not /lib64.
          (add-before 'chdir 'fix-rs6000-libdir
            (lambda _
diff --git a/gnu/packages/patches/gcc-11-libstdc++-powerpc.patch b/gnu/packages/patches/gcc-11-libstdc++-powerpc.patch
new file mode 100644
index 0000000000..aff2ef16f1
--- /dev/null
+++ b/gnu/packages/patches/gcc-11-libstdc++-powerpc.patch
@@ -0,0 +1,18 @@
+diff -u -r gcc-11.3.0.alt/libstdc++-v3/src/c++17/floating_from_chars.cc gcc-11.3.0/libstdc++-v3/src/c++17/floating_from_chars.cc
+--- gcc-11.3.0.alt/libstdc++-v3/src/c++17/floating_from_chars.cc	2023-04-13 11:36:08.169841428 +0200
++++ gcc-11.3.0/libstdc++-v3/src/c++17/floating_from_chars.cc	2023-04-13 11:36:54.825827304 +0200
+@@ -495,8 +495,14 @@
+ from_chars(const char* first, const char* last, __ieee128& value,
+ 	   chars_format fmt) noexcept
+ {
++#if _GLIBCXX_USE_CXX11_ABI
+   buffer_resource mr;
+   pmr::string buf(&mr);
++#else
++  string buf;
++  if (!reserve_string(buf))
++    return make_result(first, 0, {}, ec);
++#endif
+   size_t len = 0;
+   errc ec = errc::invalid_argument;
+   __try
-- 
2.39.2