# HG changeset patch
# User John W. Eaton <jwe@octave.org>
# Date 1257965210 18000
# Node ID bb70d16cca3b82544503f5b229660a2482e23ed7
# Parent  6fcc4179c1785622f23484440ef1112b8b655b3a
fail at configure time if IEEE floating point format is not detected

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-11  John W. Eaton  <jwe@octave.org>
+
+	* acinclude.m4 (OCTAVE_IEEE754_DATA_FORMAT): Fail if IEEE 754
+	format is not detected.
+
 2009-11-11  Shai Ayal <shaiay@users.sourceforge.net>
 
 	* configure.ac: Remove tests for ftgl.
diff --git a/acinclude.m4 b/acinclude.m4
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -978,6 +978,13 @@
 fi
 if test "$octave_cv_ieee754_data_format" = yes; then
   AC_DEFINE(HAVE_IEEE754_DATA_FORMAT, 1, [Define if your system uses IEEE 754 data format.])
+else
+  ## If the format is unknown, then you will probably not have a
+  ## useful system, so we will abort here.  Anyone wishing to
+  ## experiment with building Octave on a system without IEEE
+  ## floating point should be capable of removing this check and
+  ## the one in the octave_ieee_init function in liboctave/lo-ieee.cc.
+  AC_MSG_ERROR([IEEE 754 data format required for building Octave])
 fi
 ])
 dnl
diff --git a/liboctave/ChangeLog b/liboctave/ChangeLog
--- a/liboctave/ChangeLog
+++ b/liboctave/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-11  John W. Eaton  <jwe@octave.org>
+
+	* lo-ieee.cc (octave_ieee_init): Improve comment about systems
+	without IEEE floating point format.
+
 2009-11-11  Jaroslav Hajek  <highegg@gmail.com>
 
 	* mx-inlines.cc (mx_inline_map): New template loop.
diff --git a/liboctave/lo-ieee.cc b/liboctave/lo-ieee.cc
--- a/liboctave/lo-ieee.cc
+++ b/liboctave/lo-ieee.cc
@@ -160,7 +160,10 @@
     case oct_mach_info::flt_fmt_vax_g:
     default:
       // If the format is unknown, then you will probably not have a
-      // useful system, but we will just issue a warning and go on...
+      // useful system, so we will abort here.  Anyone wishing to
+      // experiment with building Octave on a system without IEEE
+      // floating point should be capable of removing this check and
+      // the configure test.
       (*current_liboctave_error_handler)
 	("lo_ieee_init: floating point format is not IEEE!  Maybe DLAMCH is miscompiled, or you are using some strange system without IEEE floating point math?");
       abort ();