From fcd5eb9bd0e8674a6f4987a8fce7dc1ba8f9320c Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Thu, 17 Sep 2015 03:08:36 +0200
Subject: [PATCH] [v3] test: add a check for FE_DIVBYZERO

Some architectures, such as Microblaze and Nios2, currently do not
implement FE_DIVBYZERO, even though they have <fenv.h> and
feenableexcept(). This commit adds a configure.ac check to verify
whether FE_DIVBYZERO is defined or not, and if not, disables the
problematic code in test/utils.c.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Upstream-Status: Backport [commit 4297e9058]
---
Changes v1 -> v2:

 * Use the ac_cv_have_decl_FE_DIVBYZERO variable, which is
   automatically set by AC_CHECK_DECL, to decide whether or not
   HAVE_FEDIVBYZERO should be defined.

Changes v2 -> v3:

 * Use action-if-yes of AC_CHECK_DECL as suggested in
   http://lists.freedesktop.org/archives/pixman/2014-February/003176.html
---
 configure.ac | 5 +++++
 test/utils.c | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index f93cc30..424bfd3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -891,6 +891,11 @@ if test x$have_feenableexcept = xyes; then
    AC_DEFINE(HAVE_FEENABLEEXCEPT, 1, [Whether we have feenableexcept()])
 fi
 
+AC_CHECK_DECL([FE_DIVBYZERO],
+	[AC_DEFINE(HAVE_FEDIVBYZERO, 1, [Whether we have FE_DIVBYZERO])],
+	[],
+	[[#include <fenv.h>]])
+
 AC_CHECK_FUNC(gettimeofday, have_gettimeofday=yes, have_gettimeofday=no)
 AC_CHECK_HEADER(sys/time.h, have_sys_time_h=yes, have_sys_time_h=no)
 if test x$have_gettimeofday = xyes && test x$have_sys_time_h = xyes; then
diff --git a/test/utils.c b/test/utils.c
index 222d4d5..8657966 100644
--- a/test/utils.c
+++ b/test/utils.c
@@ -966,9 +966,11 @@ enable_divbyzero_exceptions (void)
 {
 #ifdef HAVE_FENV_H
 #ifdef HAVE_FEENABLEEXCEPT
+#ifdef HAVE_FEDIVBYZERO
     feenableexcept (FE_DIVBYZERO);
+#endif
 #endif
 #endif
 }
 
 void
-- 
2.1.4