I may as well try to provide a patch. It is untested even on x86_64,
since it requires quite a few rebuilds. If it works on powerpc, it should
probably be made conditional on the architecture to avoid a world rebuild.
I do not know whether this is possible in the patches field in an origin.
Andreas
>From 5eb50bdc34759d4c917f2143e037fad62bc08ed7 Mon Sep 17 00:00:00 2001
From: Andreas Enge <andr...@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 (gcc-11)[origin]: Use patch.
---
gnu/local.mk | 1 +
gnu/packages/gcc.scm | 5 +++--
.../patches/gcc-11-libstdc++-powerpc.patch | 18 ++++++++++++++++++
3 files changed, 22 insertions(+), 2 deletions(-)
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..631e08db25 100644
--- a/gnu/packages/gcc.scm
+++ b/gnu/packages/gcc.scm
@@ -2,7 +2,7 @@
;;; Copyright © 2012-2023 Ludovic Courtès <l...@gnu.org>
;;; Copyright © 2014, 2015, 2018 Mark H Weaver <m...@netris.org>
;;; Copyright © 2014, 2015, 2016, 2017, 2019, 2021 Ricardo Wurmus
<rek...@elephly.net>
-;;; Copyright © 2015 Andreas Enge <andr...@enge.fr>
+;;; Copyright © 2015, 2023 Andreas Enge <andr...@enge.fr>
;;; Copyright © 2015-2018, 2020-2023 Efraim Flashner <efr...@flashner.co.il>
;;; Copyright © 2016 Carlos Sánchez de La Lama <csanchez...@gmail.com>
;;; Copyright © 2018 Tobias Geerinckx-Rice <m...@tobias.gr>
@@ -703,7 +703,8 @@ (define-public gcc-11
"0fdclcwf728wbq52vphfcjywzhpsjp3kifzj3pib3xcihs0z4z5l"))
(patches (search-patches "gcc-9-strmov-store-file-names.patch"
"gcc-5.0-libvtv-runpath.patch"
- "gcc-10-tree-sra-union-handling.patch"))
+ "gcc-10-tree-sra-union-handling.patch"
+ "gcc-11-libstdc++-powerpc.patch"))
(modules '((guix build utils)))
(snippet gcc-canadian-cross-objdump-snippet)))
(arguments
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
