From 70cc6595b54a72b9b852c325ffa8d2b0952e9da5 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sat, 3 Nov 2007 16:35:53 +0100
Subject: [PATCH] New module 'frexp-nolibm'.

---
 ChangeLog            |  5 +++++
 m4/frexp.m4          | 33 ++++++++++++++++++++++++++++++++-
 modules/frexp-nolibm | 26 ++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 modules/frexp-nolibm

diff --git a/ChangeLog b/ChangeLog
index 6c965e410..c83dca1ec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2007-11-03  Bruno Haible  <bruno@clisp.org>
 
+	* modules/frexp-nolibm: New file.
+	* m4/frexp.m4 (gl_FUNC_FREXP_NO_LIBM): New macro.
+
+2007-11-03  Bruno Haible  <bruno@clisp.org>
+
 	* lib/vasnprintf.c (VASNPRINTF): Don't assume that snprintf's return
 	value is C99 compliant.
 	Needed for OSF/1 5.1.
diff --git a/m4/frexp.m4 b/m4/frexp.m4
index 8e9332235..524f6d5ca 100644
--- a/m4/frexp.m4
+++ b/m4/frexp.m4
@@ -1,4 +1,4 @@
-# frexp.m4 serial 3
+# frexp.m4 serial 4
 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,
@@ -56,6 +56,37 @@ AC_DEFUN([gl_FUNC_FREXP],
   AC_SUBST([FREXP_LIBM])
 ])
 
+AC_DEFUN([gl_FUNC_FREXP_NO_LIBM],
+[
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_CACHE_CHECK([whether frexp() can be used without linking with libm],
+    [gl_cv_func_frexp_no_libm],
+    [
+      AC_TRY_LINK([#include <math.h>
+                   double x;],
+                  [int e; return frexp (x, &e) > 0;],
+        [gl_cv_func_frexp_no_libm=yes],
+        [gl_cv_func_frexp_no_libm=no])
+    ])
+  if test $gl_cv_func_frexp_no_libm = yes; then
+    gl_FUNC_FREXP_WORKS
+    case "$gl_cv_func_frexp_works" in
+      *yes) gl_func_frexp_no_libm=yes ;;
+      *)    gl_func_frexp_no_libm=no; REPLACE_FREXP=1 ;;
+    esac
+  else
+    gl_func_frexp_no_libm=no
+    dnl Set REPLACE_FREXP here because the system may have frexp in libm.
+    REPLACE_FREXP=1
+  fi
+  if test $gl_func_frexp_no_libm = yes; then
+    AC_DEFINE([HAVE_FREXP_IN_LIBC], 1,
+      [Define if the frexp() function is available in libc.])
+  else
+    AC_LIBOBJ([frexp])
+  fi
+])
+
 dnl Test whether frexp() works also on denormalized numbers (this fails e.g. on
 dnl NetBSD 3.0) and on infinite numbers (this fails e.g. on IRIX 6.5).
 AC_DEFUN([gl_FUNC_FREXP_WORKS],
diff --git a/modules/frexp-nolibm b/modules/frexp-nolibm
new file mode 100644
index 000000000..8026d76b7
--- /dev/null
+++ b/modules/frexp-nolibm
@@ -0,0 +1,26 @@
+Description:
+frexp() function: split a double into its constituents, without requiring libm.
+
+Files:
+lib/frexp.c
+m4/frexp.m4
+
+Depends-on:
+math
+isnan-nolibm
+
+configure.ac:
+gl_FUNC_FREXP_NO_LIBM
+gl_MATH_MODULE_INDICATOR([frexp])
+
+Makefile.am:
+
+Include:
+<math.h>
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible, Paolo Bonzini
+
-- 
2.11.0