[bug#38459] [PATCH] gnu: (cross-gcc-arguments|gcc-boot0): Enable 128 bit long double for POWER9.

[dftxbs3e <dftxbs3e@free.fr>]

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You are right, I can't test the commencement.scm patch yet because
bootstrap-tarballs are not built and included in GNU Guix yet. This
patch is intended to allow them to build.

Attached new patches.

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From 66bcaaebe1761499a60518dc83975006aa30b58f Mon Sep 17 00:00:00 2001
From: dftxbs3e <dftxbs3e@free.fr>
Date: Sat, 7 Dec 2019 20:26:51 +0100
Subject: [PATCH 1/2] gnu: gcc-boot0: Enable 128 bit long double for POWER9.

---
 gnu/packages/commencement.scm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 8bf7704598..a466a383bd 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -1576,6 +1576,11 @@ exec " gcc "/bin/" program
                            "--disable-shared"
                            "--enable-languages=c,c++"
 
+                           ,@(if (equal? "powerpc64le-linux-gnu" (boot-triplet))
+                               ;; On POWER9 (little endian) glibc needs the 128 bit long double type.
+                               '("--with-long-double-128")
+                               '())
+
                            ;; libstdc++ cannot be built at this stage
                            ;; ("Link tests are not allowed after
                            ;; GCC_NO_EXECUTABLES.").
-- 
2.21.0



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From 0628808608a0b0851de913a88d626234358100c5 Mon Sep 17 00:00:00 2001
From: dftxbs3e <dftxbs3e@free.fr>
Date: Sat, 7 Dec 2019 20:27:12 +0100
Subject: [PATCH 2/2] gnu: cross-gcc-arguments: Enable 128 bit long double for
 POWER9.

---
 gnu/packages/cross-base.scm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 13237fb8a8..18dc1f592b 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -150,6 +150,11 @@ base compiler and using LIBC (which may be either a libc package or #f.)"
                                "--disable-decimal-float" ;would need libc
                                "--disable-libcilkrts"
 
+                              ,@(if (equal? "powerpc64le-linux-gnu" target)
+                                   ;; On POWER9 (little endian) glibc needs the 128 bit long double type.
+                                   '("--with-long-double-128")
+                                   '())
+
                                ;; When target is any OS other than 'none' these
                                ;; libraries will fail if there is no libc
                                ;; present. See
-- 
2.21.0