'\"
'\" Generated from file 'critcl_util\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2011-2018 Andreas Kupries
'\"
.TH "critcl::util" 3tcl 1 doc "C Runtime In Tcl (CriTcl)"
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.SH NAME
critcl::util \- CriTcl Utilities
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBcritcl  ?2\&.1?\fR
.sp
package require \fBcritcl::util  ?1?\fR
.sp
\fB::critcl::util::checkfun\fR \fIname\fR ?\fIlabel\fR?
.sp
\fB::critcl::util::def\fR \fIpath\fR \fIdefine\fR ?\fIvalue\fR?
.sp
\fB::critcl::util::undef\fR \fIpath\fR \fIdefine\fR
.sp
\fB::critcl::util::locate\fR \fIlabel\fR \fIpaths\fR ?\fIcmd\fR?
.sp
.BE
.SH DESCRIPTION
.PP
\fIC Runtime In Tcl\fR, or \fICriTcl\fR , is a system for compiling C code
embedded in Tcl on the fly and either loading the resulting objects into Tcl for
immediate use or packaging them for distribution\&.  Use \fICriTcl\fR to improve
performance by rewriting in C those routines that are performance bottlenecks\&.
.PP
This document is the reference manpage for the \fBcritcl::util\fR
package\&. This package provides convenience commands for advanced
functionality built on top of the core\&.
Its intended audience are mainly developers wishing to write Tcl
packages with embedded C code\&.
.PP
This package resides in the Core Package Layer of CriTcl\&.
.PP
.PS
.nf
+----------------+
|Applications    |
| critcl         |
| critcl::app    |
+----------------+

*================*
|Core Packages   |
| critcl         |
| critcl::util   |
*================*

+----------------+
|Support Packages|
| stubs::*       |
| md5, platform  |
|  \&.\&.\&.           |
+----------------+

.fi
.PE
.PP
.SH API
.TP
\fB::critcl::util::checkfun\fR \fIname\fR ?\fIlabel\fR?
This command checks the build-time environment for the existence of
the C function \fIname\fR\&.
It returns \fBtrue\fR on success, and \fBfalse\fR otherwise\&.
.TP
\fB::critcl::util::def\fR \fIpath\fR \fIdefine\fR ?\fIvalue\fR?
This command extends the specified configuration file \fIpath\fR with a
\fB#define\fR directive for the named \fIdefine\fR\&. If the \fIvalue\fR
is not specified it will default to \fB1\fR\&.
.sp
The result of the command is an empty string\&.
.sp
Note that the configuration file is maintained in the \fBcritcl::cache\fR
directory\&.
.TP
\fB::critcl::util::undef\fR \fIpath\fR \fIdefine\fR
This command extends the specified configuration file \fIpath\fR with an
\fB#undef\fR directive for the named \fIdefine\fR\&.
.sp
The result of the command is an empty string\&.
.sp
Note that the configuration file is maintained in the \fBcritcl::cache\fR
directory\&.
.TP
\fB::critcl::util::locate\fR \fIlabel\fR \fIpaths\fR ?\fIcmd\fR?
This command checks the build-time environment for the existence of a file
in a set of possible \fIpaths\fR\&.
.sp
If the option \fIcmd\fR prefix is specified it will be called with
the full path of a found file as its only argument to perform further checks\&.
A return value of \fBfalse\fR will reject the path and continue the search\&.
.sp
The return value of the command is the found path, as listed in
\fIpaths\fR\&. As a side effect the command will also print the found path,
prefixed with the \fIlabel\fR, using \fBcritcl::msg\fR\&.
.sp
Failure to find the path is reported via \fBcritcl::error\fR, and a
possible empty string as the result, if \fBcritcl::error\fR does not
terminate execution\&.
A relative path is resolved relative to the directory
containing the \fICritcl script\fR\&.
.PP
.SH AUTHORS
Andreas Kupries
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such at \fIhttps://github\&.com/andreas-kupries/critcl\fR\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
C code, Embedded C Code, code generator, compile & run, compiler, dynamic code generation, dynamic compilation, generate package, linker, on demand compilation, on-the-fly compilation
.SH CATEGORY
Glueing/Embedded C code
.SH COPYRIGHT
.nf
Copyright (c) 2011-2018 Andreas Kupries

.fi