diff options
Diffstat (limited to 'unix/configure.in')
| -rw-r--r-- | unix/configure.in | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/unix/configure.in b/unix/configure.in index 82e68da..320930a 100644 --- a/unix/configure.in +++ b/unix/configure.in @@ -3,7 +3,7 @@ dnl This file is an input file used by the GNU "autoconf" program to dnl generate the file "configure", which is run during Tcl installation dnl to configure the system for the local environment. # -# RCS: @(#) $Id: configure.in,v 1.180 2008/03/28 17:31:47 dgp Exp $ +# RCS: @(#) $Id: configure.in,v 1.181 2008/03/30 04:26:20 kennykb Exp $ AC_INIT([tcl],[8.5]) AC_PREREQ(2.59) @@ -492,6 +492,18 @@ SC_ENABLE_LANGINFO AC_CHECK_FUNCS(chflags) #-------------------------------------------------------------------- +# Check for support of isnan() function or macro +#-------------------------------------------------------------------- + +AC_CACHE_CHECK([isnan], tcl_cv_isnan, [ + AC_TRY_LINK([#include <math.h>], [ +isnan(0.0); /* Generates an error if isnan is missing */ +], tcl_cv_isnan=yes, tcl_cv_isnan=no)]) +if test $tcl_cv_isnan = no; then + AC_DEFINE(NO_ISNAN, 1, [Do we have a usable 'isnan'?]) +fi + +#-------------------------------------------------------------------- # Darwin specific API checks and defines #-------------------------------------------------------------------- |