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# critcl::util(n) 1 doc "C Runtime In Tcl (CriTcl)"

## Name

critcl::util - CriTcl Utilities

## Table Of Contents

## Synopsis

- package require Tcl 8.4
- package require critcl ?2.1?
- package require critcl::util ?1?

- ::critcl::util::checkfun name ?label?
- ::critcl::util::def path define ?value?
- ::critcl::util::locate path define
- ::critcl::util::locate label paths ?cmd?

## Description

Welcome to the C Runtime In Tcl, CriTcl for short, a system to build C extension packages for Tcl on the fly, from C code embedded within Tcl scripts, for all who wish to make their code go faster.

This document is the reference manpage for the critcl::util 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.

This package resides in the Core Package Layer of CriTcl.

## API

::critcl::util::checkfun name ?label?

  This command checks the build-time environment for the existence of the C function name. It returns true on success, and false otherwise.

::critcl::util::def path define ?value?

  This command extends the specified configuration file path with a #define directive for the named define. If the value is not specified it will default to 1.

  The result of the command is an empty string.

  Note that the configuration file is maintained in the critcl::cache directory.

::critcl::util::locate path define

  This command extends the specified configuration file path with an #undef directive for the named define.

  The result of the command is an empty string.

  Note that the configuration file is maintained in the critcl::cache directory.

::critcl::util::locate label paths ?cmd?

  This command checks the build-time environment for the existence of a file in a set of possible paths.

  If the option cmd 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 false will reject the path and continue the search.

  The return value of the command is the found path, as listed in paths. As a side effect the command will also print the found path, prefixed with the label, using critcl::msg.

  Failure to find the path is reported via critcl::error, and a possible empty string as the result, if critcl::error does not terminate execution.

  Relative paths are allowed as elements of paths, and are normalized relative to the directory containing the currently handled critcl file.

## Authors

Andreas Kupries

## Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such at https://github.com/andreas-kupries/critcl. Please also report any ideas for enhancements you may have for either package and/or documentation.

## 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

## Category

Glueing/Embedded C code

## Copyright

Copyright © 2011-2015 Andreas Kupries