X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fexpm1.m4;h=d037392b0f81661ee34e24074489017782f08c0d;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=4f34ef371d0dbcf38fa438cbdcb72a2703929302;hpb=232b64ac929c3675c345d1b6003fc7ad725840a3;p=gnulib.git

diff --git a/m4/expm1.m4 b/m4/expm1.m4
index 4f34ef371..d037392b0 100644
--- a/m4/expm1.m4
+++ b/m4/expm1.m4
@@ -1,5 +1,5 @@
-# expm1.m4 serial 2
-dnl Copyright (C) 2010-2012 Free Software Foundation, Inc.
+# expm1.m4 serial 3
+dnl Copyright (C) 2010-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -58,6 +58,7 @@ AC_DEFUN([gl_FUNC_EXPM1],
     :
     m4_ifdef([gl_FUNC_EXPM1_IEEE], [
       if test $gl_expm1_required = ieee && test $REPLACE_EXPM1 = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether expm1 works according to ISO C 99 with IEC 60559],
           [gl_cv_func_expm1_ieee],
           [
@@ -83,7 +84,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_expm1_ieee=yes],
               [gl_cv_func_expm1_ieee=no],
-              [gl_cv_func_expm1_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_expm1_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_expm1_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_expm1_ieee" in