X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fexpl.m4;h=af60829fac182ee7f84c6d37aabf1908f937edd1;hb=refs%2Ftags%2Fstable%2F20111211;hp=ba1143ee3cce56cce3345383032bdd117153b07c;hpb=ec062d7a2671739dd977ebde3965fc93f8678a2e;p=gnulib.git

diff --git a/m4/expl.m4 b/m4/expl.m4
index ba1143ee3..af60829fa 100644
--- a/m4/expl.m4
+++ b/m4/expl.m4
@@ -1,5 +1,5 @@
-# expl.m4 serial 2
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# expl.m4 serial 5
+dnl Copyright (C) 2010-2011 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.
@@ -7,6 +7,8 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_EXPL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
   dnl Persuade glibc <math.h> to declare expl().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
@@ -51,13 +53,18 @@ AC_DEFUN([gl_FUNC_EXPL],
      || test $gl_cv_func_expl_in_libm = yes; then
     dnl Also check whether it's declared.
     dnl MacOS X 10.3 has expl() in libc but doesn't declare it in <math.h>.
-    AC_CHECK_DECL([expl], , [HAVE_DECL_EXPL=0], [#include <math.h>])
+    AC_CHECK_DECL([expl], , [HAVE_DECL_EXPL=0], [[#include <math.h>]])
   else
     HAVE_DECL_EXPL=0
     HAVE_EXPL=0
-    AC_LIBOBJ([expl])
-    AC_REQUIRE([gl_FUNC_FLOORL])
-    EXPL_LIBM="$FLOORL_LIBM"
+    dnl Find libraries needed to link lib/expl.c.
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      AC_REQUIRE([gl_FUNC_EXP])
+      EXPL_LIBM="$EXP_LIBM"
+    else
+      AC_REQUIRE([gl_FUNC_FLOORL])
+      EXPL_LIBM="$FLOORL_LIBM"
+    fi
   fi
   AC_SUBST([EXPL_LIBM])
 ])