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[gnulib.git] / m4 / frexpl.m4

diff --git a/m4/frexpl.m4 b/m4/frexpl.m4
index 8832181..dad5dd7 100644 (file)
--- a/m4/frexpl.m4
+++ b/m4/frexpl.m4
@@ -1,4 +1,4 @@
-# frexpl.m4 serial 3
+# frexpl.m4 serial 5
 dnl Copyright (C) 2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -80,6 +80,8 @@ AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
     esac
   else
     gl_func_frexpl_no_libm=no
+    dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+    REPLACE_FREXPL=1
   fi
   if test $gl_func_frexpl_no_libm = yes; then
     AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
@@ -93,8 +95,8 @@ AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
   fi
 ])
 
-dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1) and
-dnl also on infinite numbers (this fails e.g. on IRIX 6.5).
+dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1 and
+dnl on BeOS) and also on infinite numbers (this fails e.g. on IRIX 6.5).
 AC_DEFUN([gl_FUNC_FREXPL_WORKS],
 [
   AC_REQUIRE([AC_PROG_CC])
@@ -108,16 +110,30 @@ int main()
 {
   volatile long double x;
   /* Test on finite numbers.  */
+  x = 16.0L;
   {
     int exp = -9999;
-    x = 16.0L;
     frexpl (x, &exp);
     if (exp != 5)
       return 1;
   }
+  /* Test on large finite numbers.  This fails on BeOS at i = 16322, while
+     LDBL_MAX_EXP = 16384.
+     In the loop end test, we test x against Infinity, rather than comparing
+     i with LDBL_MAX_EXP, because BeOS <float.h> has a wrong LDBL_MAX_EXP.  */
+  {
+    int i;
+    for (i = 1, x = 1.0L; x != x + x; i++, x *= 2.0L)
+      {
+        int exp = -9999;
+        frexpl (x, &exp);
+        if (exp != i)
+          return 1;
+      }
+  }
   /* Test on infinite numbers.  */
+  x = 1.0L / 0.0L;
   {
-    x = 1.0L / 0.0L;
     int exp;
     long double y = frexpl (x, &exp);
     if (y != x)
@@ -126,8 +142,8 @@ int main()
   return 0;
 }], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
       [case "$host_os" in
-         aix* | irix*) gl_cv_func_frexpl_works="guessing no";;
-         *)            gl_cv_func_frexpl_works="guessing yes";;
+         aix* | beos* | irix*) gl_cv_func_frexpl_works="guessing no";;
+         *)                    gl_cv_func_frexpl_works="guessing yes";;
        esac
       ])
     ])