fpieee: More comments.

* m4/fpieee.m4 (gl_FP_IEEE): Add more comments.

diff --git a/ChangeLog b/ChangeLog
index be65d2c..9a5bc3f 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-02-26  Bruno Haible  <bruno@clisp.org>
+
+       fpieee: More comments.
+       * m4/fpieee.m4 (gl_FP_IEEE): Add more comments.
+
 2012-02-25  Bruno Haible  <bruno@clisp.org>
 
        Tests for module 'log10l'.

diff --git a/m4/fpieee.m4 b/m4/fpieee.m4
index 93b8d90..82fd778 100644 (file)
--- a/m4/fpieee.m4
+++ b/m4/fpieee.m4
@@ -1,4 +1,4 @@
-# fpieee.m4 serial 1
+# fpieee.m4 serial 2
 dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -36,9 +36,11 @@ AC_DEFUN([gl_FP_IEEE],
       # <http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V51B_HTML/MAN/MAN3/0600____.HTM>
       if test -n "$GCC"; then
         # GCC has the option -mieee.
+        # For full IEEE compliance (rarely needed), use option -mieee-with-inexact.
         CPPFLAGS="$CPPFLAGS -mieee"
       else
-        # Compaq (ex-DEC) C has the option -ieee.
+        # Compaq (ex-DEC) C has the option -ieee, equivalent to -ieee_with_no_inexact.
+        # For full IEEE compliance (rarely needed), use option -ieee_with_inexact.
         CPPFLAGS="$CPPFLAGS -ieee"
       fi
       ;;