From 3fe7c2612c5f6a3c5cb7b20f4b020ab52da6c598 Mon Sep 17 00:00:00 2001
From: enge <enge@211d60ee-9f03-0410-a15a-8952a2c7a4e4>
Date: Wed, 13 Jul 2011 12:13:04 +0000
Subject: configure.ac, mpc.m4: to test for complex.h, always compile a test
 programme    closes bug #12829

git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@1013 211d60ee-9f03-0410-a15a-8952a2c7a4e4
---
 m4/mpc.m4 | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'm4')

diff --git a/m4/mpc.m4 b/m4/mpc.m4
index 586aa47..b99ed96 100644
--- a/m4/mpc.m4
+++ b/m4/mpc.m4
@@ -19,6 +19,66 @@ along with the MPC Library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */
 
+
+#
+# SYNOPSIS
+#
+#
+MPC_COMPLEX_H
+#
+# DESCRIPTION
+#
+# Check whether complex.h is usable; if yes, define HAVE_COMPLEX_H.
+# On solaris, one also needs the libm; in that case, it is added to LIB,
+# and HAVE_LIBM is defined.
+#
+AC_DEFUN([MPC_COMPLEX_H], [
+   AC_CHECK_HEADER(
+      [complex.h],
+      [
+         m4_define(
+            [MPC_CONFTEST],
+            [
+               AC_LANG_PROGRAM(
+                  [[#include <complex.h>]],
+                  [[complex double x = 1.0 + 2.0 * I; return (creal (x) + cimag (x));]]
+               )
+            ]
+         )
+
+         AC_MSG_CHECKING(whether creal and cimag can be used without libm)
+         AC_LINK_IFELSE(
+            [MPC_CONFTEST],
+            [
+               AC_MSG_RESULT([yes])
+               AC_DEFINE([HAVE_COMPLEX_H], [1], [complex.h present and usable])
+            ],
+            [
+               AC_MSG_RESULT([no])
+               AC_CHECK_LIB([m], [creal],
+                  [
+                     AC_MSG_CHECKING(whether creal and cimag can be used with libm)
+                     AC_LINK_IFELSE(
+                        [MPC_CONFTEST],
+                        [
+                           AC_MSG_RESULT([yes])
+                           LIBS="-lm $LIBS"
+                           AC_DEFINE([HAVE_LIBM], [1], [libm needed for creal])
+                           AC_DEFINE([HAVE_COMPLEX_H], [1], [complex.h present and usable])
+                        ],
+                        [
+                           AC_MSG_RESULT([no])
+                        ]
+                     )
+                  ]
+               )
+            ]
+         )
+      ]
+   )
+])
+
+
 #
 # SYNOPSIS
 #
-- 
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