From 2e4dcc645df9b9c6779976381d7561adfcc0cbc0 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Fri, 20 Dec 2013 17:55:30 +0000
Subject: [PATCH] Don't link with -lm if the check using it failed.

It is useless and can, apparently, result in problems, see #15746.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75403 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 configure    | 6 +++---
 configure.in | 7 +++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/configure b/configure
index a11a471076..cc7b12ce9c 100755
--- a/configure
+++ b/configure
@@ -22180,9 +22180,9 @@ $as_echo "yes" >&6; }
 else
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
+    save_LIBS="$LIBS"
     LIBS="$LIBS -lm"
-    # use different functions to avoid configure caching
-    have_sin=0
+        have_sin=0
     have_ceil=0
     for ac_func in sin
 do :
@@ -22214,7 +22214,7 @@ $as_echo "yes" >&6; }
     else
         { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-        # not sure we should warn the user, crash, etc.
+                        LIBS="$save_LIBS"
     fi
 fi
 
diff --git a/configure.in b/configure.in
index c691665d1b..126a461c42 100644
--- a/configure.in
+++ b/configure.in
@@ -2316,8 +2316,9 @@ if test "$have_cos" = 1 -a "$have_floor" = 1; then
     AC_MSG_RESULT(yes)
 else
     AC_MSG_RESULT(no)
+    save_LIBS="$LIBS"
     LIBS="$LIBS -lm"
-    # use different functions to avoid configure caching
+    dnl use different functions to avoid configure caching
     have_sin=0
     have_ceil=0
     AC_CHECK_FUNCS(sin, have_sin=1)
@@ -2327,7 +2328,9 @@ else
         AC_MSG_RESULT(yes)
     else
         AC_MSG_RESULT(no)
-        # not sure we should warn the user, crash, etc.
+        dnl not sure we should warn the user, crash, etc. but don't link with
+        dnl -lm it might result in failure of the subsequent tests too
+        LIBS="$save_LIBS"
     fi
 fi