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

[dftxbs3e <dftxbs3e@free.fr>]

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Hello,

This is to be applied against core-updates and fixes:

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

dftxbs3e


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From dcbd3a812038fbc1a229836a850f529aa35b45c8 Mon Sep 17 00:00:00 2001
From: dftxbs3e <dftxbs3e@free.fr>
Date: Mon, 2 Dec 2019 20:02:24 +0100
Subject: [PATCH 2/2] gnu: cross-gcc-arguments: Enable 128 bit long double for
 POWER9.

---
 gnu/packages/cross-base.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 13237fb8a8..e60a8ed03a 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -150,6 +150,9 @@ base compiler and using LIBC (which may be either a libc package or #f.)"
                                "--disable-decimal-float" ;would need libc
                                "--disable-libcilkrts"
 
+                              ;; 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


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From 87b30dcb90572bd46c8eb087efe7d75db362f59b Mon Sep 17 00:00:00 2001
From: dftxbs3e <dftxbs3e@free.fr>
Date: Mon, 2 Dec 2019 19:58:19 +0100
Subject: [PATCH 1/2] gnu: gcc-boot0: Enable 128 bit long double for POWER9.

---
 gnu/packages/commencement.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 8bf7704598..bfdba4dbd2 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -1576,6 +1576,9 @@ exec " gcc "/bin/" program
                            "--disable-shared"
                            "--enable-languages=c,c++"
 
+                           ;; 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