branch master updated: gnu: python-matplotlib: Fix rounding errors on x86 CPUs.

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     new 81643c4  gnu: python-matplotlib: Fix rounding errors on x86 CPUs.
81643c4 is described below

commit 81643c4cf3e61f5a98b92a72a92c230f5e7ca905
Author: Diego Nicola Barbato <dnbarbato@posteo.de>
AuthorDate: Sat Nov 14 15:07:28 2020 -0500

    gnu: python-matplotlib: Fix rounding errors on x86 CPUs.
    
    Fixes <https://issues.guix.gnu.org/40406>.
    
    Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
---
 gnu/packages/python-xyz.scm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 278b557..f2f812a 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -89,6 +89,7 @@
 ;;; Copyright © 2020 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
 ;;; Copyright © 2020 Bonface Munyoki Kilyungi <bonfacemunyoki@gmail.com>
 ;;; Copyright © 2020 Ekaitz Zarraga <ekaitz@elenq.tech>
+;;; Copyright © 2020 Diego N. Barbato <dnbarbato@posteo.de>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -5062,6 +5063,9 @@ convert between colorspaces like sRGB, XYZ, CIEL*a*b*, 
CIECAM02, CAM02-UCS, etc.
                ;; has not effect.
                (setenv "LD_LIBRARY_PATH" (string-append cairo "/lib"))
                (setenv "HOME" (getcwd))
+               ;; Fix rounding errors when using the x87 FPU.
+               (when (string-prefix? "i686" ,(%current-system))
+                 (setenv "CFLAGS" "-ffloat-store"))
                (call-with-output-file "setup.cfg"
                  (lambda (port)
                    (format port "[directories]~%