'\"
'\" Generated from file 'critcl_introduction\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) Jean-Claude Wippler
'\" Copyright (c) Steve Landers
'\" Copyright (c) 2011-2015 Andreas Kupries
'\"
.TH "critcl_introduction" 3tcl 3\&.1\&.17 doc "C Runtime In Tcl (CriTcl)"
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.BS
.SH NAME
critcl_introduction \- Introduction To CriTcl
.SH DESCRIPTION
.PP
Welcome to the \fIC Runtime In Tcl\fR, \fICriTcl\fR 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\&.
.PP
CriTcl started life as an experiment by Jean-Claude Wippler and was a
self-contained Tcl package to build C code into a Tcl/Tk extension on
the fly\&. It was somewhat inspired by Brian Ingerson's \fIInline\fR
for \fIPerl\fR, but is considerably more lightweight\&.
.PP
It is for the last 5% to 10% when pure Tcl, which does go a long way,
is not sufficient anymore\&. I\&.e\&. for
.IP [1]
when the last bits of performance are needed,
.IP [2]
access to 3rd party libraries,
.IP [3]
hiding critical pieces of your library or application, and
.IP [4]
simply needing features provided only by C\&.
.PP
.PP
The following sections first reference a few related documents
which may or may not be of interest to you, depending on if you are
just a plain user of the system, trying to get and build/install it,
or are going deep into the internals for either edification or
modification\&.
.PP
This is followed by an introduction to the modes of operation
supported by the system, and its general architecture as seen by a
user\&.
.SH "RELATED DOCUMENTS"
.IP [1]
\fICritcl - License\fR\&.
.IP [2]
\fIUsing Critcl\fR
.IP [3]
\fICritcl - How To Get The Sources\fR\&.
.IP [4]
\fICritcl - The Installer's Guide\fR\&.
.IP [5]
\fICritcl - Application Package Reference\fR
.IP [6]
\fICritcl - Package Reference\fR
.IP [7]
\fICritcl - The Developer's Guide\fR\&.
.PP
.SH "MODES OF OPERATION/USE"
CriTcl can be used in three different modes of operation, called
.IP [1]
\fICompile & Run\fR, and
.IP [2]
\fIGenerate Package\fR
.IP [3]
\fIGenerate TEA Package\fR
.PP
Of these three \fICompile & Run\fR came first and is the default
when using the package directly\&. In that case the package collects the
C fragments, builds them as needed, and caches the results for quick
reuse when the same code is used in the future again\&.
.PP
The second mode, \fIGenerate Package\fR, was introduced to enable
the creation of (prebuilt) deliverable packages which do not depend on
the existence of a build system, i\&.e\&. C compiler, on the target
machine\&.
This was originally done through the experimental \fBCritbind\fR tool,
and is now handled by the \fICriTcl Application\fR, also named
\fBcritcl\fR\&.
.PP
Newly introduced with Critcl version 3 is
\fIGenerate TEA Package\fR\&. This mode constructs a directory
hierarchy from the package which can later be built like a regular TEA
package, i\&.e\&. using
.CS


	\&.\&.\&./configure --prefix \&.\&.\&.
	make all isntall

.CE
.SH "SYSTEM ARCHITECTURE"
The system consists of two main layers, as seen in the figure below,
plus a support layer containing general packages the system uses during
operation\&.
.PP
.PS
.nf
+----------------+
|Applications    |
| critcl         |
| critcl::app    |
+----------------+

+----------------+
|Core Packages   |
| critcl         |
| critcl::util   |
+----------------+

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

.fi
.PE
.PP
.IP [1]
At the top we have an application built on top of the core packages,
providing command line access to the second and third usage modes,
i\&.e\&. \fIGenerate Package\fR and \fIGenerate TEA Package\fR\&.
.RS
.TP
\fBcritcl\fR
.TP
\fBcritcl::app\fR
.RE
.IP [2]
Below that is the core package providing the essential functionality
of the system, plus various utility packages which make common tasks
more convenient\&.
.RS
.TP
\fBcritcl\fR
.TP
\fBcritcl::util\fR
.RE
.IP [3]
Lastly a layer of supporting packages, mostly external to critcl\&.
.RS
.TP
\fBmd5\fR
For this pure-Tcl package to be fast users should get one of several
possible accelerator packages:
.RS
.IP [1]
\fBtcllibc\fR
.IP [2]
\fBTrf\fR
.IP [3]
\fBmd5c\fR
.RE
.TP
\fBcmdline\fR
.TP
\fBplatform\fR
.TP
\fBstubs::container\fR
.TP
\fBstubs::reader\fR
.TP
\fBstubs::writer\fR
.TP
\fBstubs::gen\fR
.TP
\fBstubs::gen::init\fR
.TP
\fBstubs::gen::header\fR
.TP
\fBstubs::gen::decl\fR
.TP
\fBstubs::gen::macro\fR
.TP
\fBstubs::gen::slot\fR
.TP
\fBstubs::gen::lib\fR
.RE
.PP
.SH EXAMPLES
.PP
The sources of Critcl, should you have gotten them, contain
several larger examples show-casing various aspects of the
system\&. These demonstration packages can all be found in the
sub-directory "\fIexamples/\fR" of the sources\&.
.PP
Lots of smaller examples can be found in the document
\fIUsing CriTcl\fR, an introduction to Critcl by way of a of
examples\&. These focus more on specific critcl commands than the
overall picture shown by the large examples mentioned in the previous
paragraph\&.
.PP
The latest changes are found at the top\&.
.SH "CHANGES FOR VERSION 3\&.1\&.17"
.IP [1]
Extension: Allow duplicate arg- and result-type definitions if
they are fully identical\&.
.IP [2]
Bugfix\&. The application mishandled the possibility of
identical-named \fBcritcl::tsource\fRs\&. Possible because
\fBcritcl::tsource\fRs can be in subdirectories, a structure
which is \fInot\fR retained in the assembled package, causing
such files to overwrite each other and at least one lost\&. Fixed
by adding a serial number to the file names in the assembled
package\&.
.IP [3]
Bugfix in the static scanner which made it loose requirement
information\&. Further added code to generally cleanup results at
the end (removal of duplicates, mainly)\&.
.IP [4]
Bugfix: Fixed issue #76\&.
Support installation directories which are not in the \fBauto_path\fR\&.
Without the patch the installed \fBcritcl\fR will not find its
own packages and fail\&. Thank you to
\fISimon Bachmann\fR [https://github\&.com/lupylucke] for the
report and patch, and then his patience with me to getting to
actually apply it\&.
.IP [5]
Bugfix: Fixed issue #75\&.
Extended \fBcritcl::include\fR to now take multiple paths\&.
.IP [6]
Added new compatibility package \fBlmap84\fR\&.
.IP [7]
Fixed typos in various documentation files\&.
.IP [8]
Fixed bug introduced by commit 86f415dd30 (3\&.1\&.16 release)\&. The
separation of \fBcritcl::ccode\fR into user and work layers
means that location retrieval has to go one more level up to
find the user location\&.
.IP [9]
New supporting package \fBcritcl::cutil\fR\&. Provides common
C level facilities useful to packages (assertions, tracing,
memory allocation shorthands)\&.
.IP [10]
Modified package \fBcritcl\fR to make use of the new
tracing facilities to provide tracing of arguments and results
for \fBcritcl::ccommand\fR and \fBcritcl::cproc\fR invokations\&.
.IP [11]
Modified packages \fBcritcl\fR and \fBcritcl::class\fR
to provide better function names for (class) method tracing\&.
Bumped package \fBcritcl::class\fR to version 1\&.0\&.7\&.
.IP [12]
Extended the support package \fBcritcl::literals\fR with
limited configurability\&. It is now able to generate code for
C-level access to the pool without Tcl types (Mode \fBc\fR)\&.
The previously existing functionality is accesssible under mode
\fBtcl\fR, which also is the default\&. Both modes can be used
together\&.
.IP [13]
Extended the support package \fBcritcl::emap\fR with
limited configurability\&. It is now able to generate code for
C-level access to the mapping without Tcl types
(Mode \fBc\fR)\&. The previously existing functionality is
accessible under mode \fBtcl\fR, which also is the
default\&. Both modes can be used together\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.16"
.IP [1]
New feature\&. Extended \fBcritcl::cproc\fR's argument handling
to allow arbitrary mixing of required and optional arguments\&.
.IP [2]
New feature\&.
\fIPotential Incompatibility\fR\&.
.sp
Extended \fBcritcl::cproc\fR's argument handling to treat an
argument \fBargs\fR as variadic if it is the last argument of
the procedure\&.
.IP [3]
New feature\&. Added two introspection commands,
\fBcritcl::has-argtype\fR and \fBcritcl::has-resulttype\fR\&.
These enable a user to test if a specific (named) type
conversion is implemented or not\&.
.IP [4]
Added new result type \fBTcl_Obj*0\fR, with alias
\fBobject0\fR\&. The difference to \fBTcl_Obj*\fR is in
the reference counting\&.
.IP [5]
Extended the command \fBcritcl::argtypesupport\fR with new
optional argument through which to explicitly specify the
identifier for guarding against multiple definitions\&.
.IP [6]
Bugfix: Fixed problem with the implementation of issue #54 (See
3\&.1\&.14)\&. Always create the secondary log file\&. Otherwise
end-of-log handling may break, unconditionally assuming its
existence\&.
.IP [7]
Bugfix: Fixed problem with the internal change to the hook
\fBHandleDeclAfterBuild\fR\&. Corrected the forgotten
\fBcritcl::cconst\fR\&.
.IP [8]
Debugging aid: Added comment holding the name of the result
type when emitting result conversions\&.
.IP [9]
Bugfix: Fixed issue #60\&. Unbundled the package directories
containing multiple packages\&. All directories under "\fIlib/\fR"
now contain exactly one package\&.
.IP [10]
Bugfix: Fixed issue #62, a few \fBdict exists\fR commands
operating on a fixed string instead of a variable\&.
.IP [11]
Bugfix: Fixed issue #56\&. Release builders are reminded to run
the tests\&.
.IP [12]
Bugfix: Fixed issue #55\&. For FreeBSD critcl's platform package
now identifies the Kernel ABI version\&. Initialization of the
cache directory now also uses \fBplatform::identify\fR for the
default path, instead of \fBplatform::generic\fR\&.
.IP [13]
Bugfix: Fixed issue #58\&. Simplified the setup and use of
md5\&. Critcl now makes use of its own package for md5, using
itself to built it\&. There is no chicken/egg problem with this
as the \fB-pkg\fR mode used for this does not use md5\&. That
is limited to mode \fIcompile & run\fR\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.15"
.IP [1]
Fixed version number bogosity with \fB3\&.1\&.14\fR\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.14"
.IP [1]
Fixed issue #36\&. Added message to target \fBall\fR of the
Makefile generated for TEA mode\&. Additionally tweaked other
parts of the output to be less noisy\&.
.IP [2]
Accepted request implied in issue #54\&. Unconditionally save
the compiler/linker build log into key \fBlog\fR of the
dictionary returned by \fBcresults\fR, and save a copy of only
the execution output in the new key \fBexl\fR ("execution
log")\&.
.IP [3]
Fixed issue #53\&. Clarified the documentation of commands
\fBcritcl::load\fR and \fBcritcl::failed\fR with regard
to their results and the throwing of errors (does not happen)\&.
.IP [4]
Fixed issue #48\&. Modified mode "compile & run" to allow new
declarations in a file, after it was build, instead of
erroring out\&. The new decls are build when needed\&. Mode
"precompile" is unchanged and will continue to trap the
situation\&.
.IP [5]
Fixed issue #52\&. Updated the local Tcl/Tk headers to
8\&.4\&.20, 8\&.5\&.13, and 8\&.6\&.4\&.
.IP [6]
Fixed issue #45\&. New feature command \fBcritcl::cconst\fR\&.
.IP [7]
\fBcritcl::util\fR: New command \fBlocate\fR to find a
file across a set of paths, and report an error when not
found\&. This is for use in autoconf-like header-searches and
similar configuration tests\&.
.IP [8]
Modified 'AbortWhenCalledAfterBuild' to dump the entire stack
(info frame!)\&. This should make it easier to determine the
location of the troubling declaration\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.13"
.IP [1]
Merged PR #43\&. Fixed bug loading adjunct Tcl sources\&.
.IP [2]
Fixes in documentation and generated code of package
"critcl::enum"\&. Bumped to version 1\&.0\&.1\&.
.IP [3]
Fixes in documentation of package "critcl::bitmap"\&.
.IP [4]
New package "critcl::emap"\&. In essence a variant or cross of
"critcl::bitmap" with behaviour like "critcl::enum"\&.
.IP [5]
Merged PR #49\&. Fixed documentation typo\&.
.IP [6]
Merged PR #46\&. Fixed documentation typo\&.
.IP [7]
Merged PR #47\&. Fixes to test results to match the accumulated
code changes\&. Also made portable across Tcl versions (varying
error syntax)\&.
.IP [8]
New predefined argument- and result-type "wideint" mapping to
Tcl_WideInt\&.
.IP [9]
New predefined argument-type "bytes" mapping to tuple of
byte-array data and length\&. Note: The existing "bytearray"
type (and its aliases) was left untouched, to keep backward
compatibility\&.
.IP [10]
Modified the internal interface between the Tcl shim and C
function underneath "critcl::cproc" with respect to the
handling of optional arguments\&.
An optional argument "X" now induces the use of two C
arguments, "X" and "has_X"\&.  The new argument "has_X" is of
boolean (int) type\&. It is set to true when X is set, and set
to false when X has the default value\&. C code which cares
about knowing if the argument is default or not is now able to
check that quickly, without having to code the default value
inside\&.
NOTE: This change is visible in the output of the advanced
commands "argcnames", "argcsignature", "argvardecls",
and "argconversion"\&.
.IP [11]
Fixed issue #50 and documented the availability of variable
"interp" (type Tcl_Interp*) within "critcl::cinit" C code
fragments\&.
Note that while the old, undocumented name of the variable,
"ip", is still usable, it is deprecated\&. It will be fully
removed in two releases, i\&.e\&. for release 3\&.1\&.15\&.
The variable name was changed to be consistent with other code
environments\&.
.IP [12]
Fixed issue #51\&. Disabled the generation of #line directives
for "critcl::config lines 0" coming from template files, or
code generated with them before the final value of this
setting was known\&.
.IP [13]
Fixed issue with handling of namespaced package names in
"critcl::iassoc"\&. Equivalent to a bug in "critcl::class" fixed
for critcl 3\&.1\&.1, critcl::class 1\&.0\&.1\&.
Note: "literals", "enum", "emap", and "bitmap" do not require
a fix as they are all built on top of "iassoc"\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.12"
.IP [1]
Fixed issue 42\&. Clear ::errorInfo immediately after startup to
prevent leakage of irrelevant (caught) errors into our script
and confusing the usage code\&.
.IP [2]
Fixed issue 40\&. Keep the order of libraries, and allow
duplicates\&. Both are things which are occasionally required for
proper linking\&.
.IP [3]
Extended the utility package \fBcritcl::literals\fR to
declare a cproc result-type for a pool\&.
.sp
Further fixed the generated header to handle multiple inclusion\&.
.sp
Bumped version to 1\&.1\&.
.IP [4]
Fixed issue with utility package \fBcritcl::bitmap\fR\&.
.sp
Fixed the generated header to handle multiple inclusion\&.
.sp
Bumped version to 1\&.0\&.1\&.
.IP [5]
Created new utility package \fBcritcl::enum\fR for the
quick and easy setup and use of mappings between C values
and Tcl strings\&.
Built on top of \fBcritcl::literals\fR\&.
.IP [6]
Added examples demonstrating the use of the utility packages
\fBcritcl::literals\fR,
\fBcritcl::bitmap\fR, and
\fBcritcl::enum\fR
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.11"
.IP [1]
Fixed issue #37, via pull request #38, with thanks to
Jos DeCoster\&. Information was stored into the v::delproc
and v::clientdata arrays using a different key than when
retrieving the same information, thus failing the latter\&.
.IP [2]
New convenience command \fBcritcl::include\fR for easy
inclusion of headers and other C files\&.
.IP [3]
New command \fBcritcl::make\fR to generate a local header of
other C files for use by other parts of a package through
inclusion\&.
.IP [4]
New utility package \fBcritcl::literals\fR for quick and
easy setup of and access to pools of fixed Tcl_Obj* strings\&.
Built on top of \fBcritcl::iassoc\fR\&.
.IP [5]
New utility package \fBcritcl::bitmap\fR for quick and easy
setup and use of mappings between C bitsets and Tcl lists whose
string elements represent that set\&.
Built on top of \fBcritcl::iassoc\fR\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.10"
.IP [1]
Fixed code version numbering forgotten with 3\&.1\&.9\&.
.IP [2]
Fixed issue #35\&. In package mode (-pkg) the object cache
directory is unique to the process, thus we do not need
content-hashing to generate unique file names\&. A simple
counter is sufficient and much faster\&.
.sp
Note that mode "compile & run" is not as blessed and still
uses content-hasing with md5 to ensure unique file names
in its per-user object cache\&.
.IP [3]
Fixed issue where the \fBccommand\fR forgot to use its body as
input for the UUID generation\&. Thus ignoring changes to it in
mode compile & run, and not rebuilding a library for changed
sources\&. Bug and fix reported by Peter Spjuth\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.9"
.IP [1]
Fixed issue #27\&. Added missing platform definitions for
various alternate linux and OS X targets\&.
.IP [2]
Fixed issue #28\&. Added missing -mXX flags for linking at the
linux-{32,64}-* targets\&.
.IP [3]
Fixed issue #29\&. Replaced the use of raw "cheaders"
information in the processing of "cdefines" with the proper
include directives derived from it\&.
.IP [4]
Fixed the issue behind rejected pull request #30 by Andrew
Shadura\&. Dynamically extract the stubs variable declarations
from the Tcl header files and generate matching variable
definitions for use in the package code\&. The generated code
will now be always consistent with the headers, even when
critcl's own copy of them is replaced by system headers\&.
.IP [5]
Fixed issue #31\&. Accepted patch by Andrew Shadura, with
changes (comments), for easier integration of critcl with
OS package systems, replacing critcl's copies of Tcl headers
with their own\&.
.IP [6]
Fixed issue #32\&. Merged pull request by Andrew Shadura\&.
Various typos in documentation and comments\&.
.IP [7]
Fixed issue #34\&. Handle files starting with a dot better\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.8"
.IP [1]
Fixed issue with package indices generated for Tcl 8\&.4\&.
Join the list of commands with semi-colon, not newline\&.
.IP [2]
Fixed issue #26 which brought up use-cases I had forgotten to
consider while fixing bug #21 (see critcl 3\&.1\&.6)\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.7"
.IP [1]
Fixed issue #24\&. Extract and unconditionally display compiler
warnings found in the build log\&. Prevents users from missing
warnings which, while not causing the build to fail, may
still indicate problems\&.
.IP [2]
New feature\&. Output hook\&. All non-messaging user output is now
routed through the command \fBcritcl::print\fR, and users are
allowed to override it when using the critcl application-as-package\&.
.IP [3]
New feature, by Ashok P\&. Nadkarni\&. Platform configurations can
inherit values from configurations defined before them\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.6"
.IP [1]
Fixed issue #21\&. While the multi-definition of the stub-table
pointer variables was ok with for all the C linkers seen so far
C++ linkers did not like this at all\&. Reworked the code to
ensure that this set of variables is generated only once, in
the wrapper around all the pieces to assemble\&.
.IP [2]
Fixed issue #22, the handling of the command identifier
arguments of \fBcritcl::ccommand\fR, \fBcritcl::cproc\fR, and
\fBcritcl::cdata\fR\&. We now properly allow any Tcl identifier
and generate proper internal C identifiers from them\&.
.sp
As part of this the signature of command \fBcritcl::name2c\fR
changed\&. The command now delivers a list of four values instead
of three\&. The new value was added at the end\&.
.sp
Further adapted the implementation of package
\fBcritcl::class\fR, a user of \fBcritcl::name2c\fR\&.
This package is now at version 1\&.0\&.6 and requires critcl 3\&.1\&.6
.sp
Lastly fixed the mis-handling of option \fB-cname\fR in
\fBcritcl::ccommand\fR, and \fBcritcl::cproc\fR\&.
.IP [3]
Fixed issue #23\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.5"
.IP [1]
Fixed issue #19\&. Made the regular expression extracting the
MSVC version number more general to make it work on german
language systems\&. This may have to be revisited in the future,
for other Windows locales\&.
.IP [2]
Fixed issue #20\&. Made option -tea work on windows, at least in
a unix emulation environment like msys/mingw\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.4"
.IP [1]
Bugfix in package \fBcritcl::class\fR\&. Generate a dummy
field in the class structure if the class has no class
variables\&. Without this change the structure would be empty,
and a number of compilers are not able to handle such a type\&.
.IP [2]
Fixed a typo which broke the win64 configuration\&.
.IP [3]
Fixed issue #16, a typo in the documentation of command
\fBcritcl::class\fR\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.3"
.IP [1]
Enhancement\&. In detail:
.IP [2]
Added new argument type "pstring", for "Pascal String", a
counted string, i\&.e\&. a combination of string pointer and string
length\&.
.IP [3]
Added new methods \fBcritcl::argtypesupport\fR and
\fB::critcl::argsupport\fR to define and use additional
supporting code for an argument type, here used by "pstring"
above to define the necessary structure\&.
.IP [4]
Semi-bugfixes in the packages \fBcritcl::class\fR and
\fBcritcl::iassoc\fR\&. Pragmas for the AS meta data scanner
to ensure that the template files are made part of the package\&.
Versions bumped to 1\&.0\&.4 and 1\&.0\&.1 respectively\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.2"
.IP [1]
Enhancement\&. In detail:
.IP [2]
Extended \fBcritcl::cproc\fR to be able to handle optional
arguments, in a limited way\&. This is automatically available to
\fBcritcl::class\fR cproc-based methods as well\&.
.IP [3]
Bugfix in \fBlassign\fR emulation for Tcl 8\&.4\&.  Properly set
unused variables to the empty string\&.  Bumped version of
emulation package \fBlassign84\fR to 1\&.0\&.1\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1\&.1"
.IP [1]
Bugfixes all around\&. In detail:
.IP [2]
Fixed the generation of wrong#args errors for
\fBcritcl::cproc\fR and derived code (\fBcritcl::class\fR
cproc-based methods)\&. Use NULL if there are no arguments, and
take the offset into account\&.
.IP [3]
Fixed the handling of package names by
\fBcritcl::class\fR\&. Forgot that they may contain namespace
separators\&. Bumped to version 1\&.0\&.1\&.
.IP [4]
Extended a \fBcritcl::class\fR generated error message in
instance creation for clarity\&. Bumped to version 1\&.0\&.2\&.
.PP
.SH "CHANGES FOR VERSION 3\&.1"
.IP [1]
Added a new higher-level package \fBcritcl::iassoc\fR\&.
.sp
This package simplifies the creation of code associating data
with an interpreter via Tcl's \fBTcl_(Get|Set)AssocData()\fR APIs\&. The
user can concentrate on his data while all the necessary boilerplate
C code to support this is generated by the package\&.
.sp
This package uses several of the new features which were added
to the core \fBcritcl\fR package, see below\&.
.IP [2]
Added the higher-level package \fBcritcl::class\fR\&.
.sp
This package simplifies the creation of C level objects with
class and instance commands\&. The user can write a class definition
with class- and instance-variables and -methods similar to a TclOO
class, with all the necessary boilerplate C code to support this
generated by the package\&.
.sp
This package uses several of the new features which were added
to the core \fBcritcl\fR package, see below\&.
.IP [3]
Extended the API for handling TEApot metadata\&. Added the
command \fBcritcl::meta?\fR to query the stored information\&. Main use
currently envisioned is retrieval of the current package's name by
utility commands, for use in constructed names\&. This particular
information is always available due to the static scan of the package
file on execution of the first critcl command\&.
.sp
The new packages \fBcritcl::iassoc\fR and
\fBcritcl::class\fR (see above) are users of this command\&.
.IP [4]
Extended the API with a command, \fBcritcl::name2c\fR, exposing
the process of converting a Tcl name into base name, namespace, and C
namespace\&. This enables higher-level code generators to generate the same
type of C identifiers as \fBcritcl\fR itself\&.
.sp
The new package \fBcritcl::class\fR (see above) is a user
of this command\&.
.IP [5]
Extended the API with a command, \fBcritcl::source\fR,
executing critcl commands found in a separate file in the context of
the current file\&. This enables easier management of larger bodies of
code as it allows the user to split such up into easier to digest
smaller chunks without causing the generation of multiple packages\&.
.IP [6]
Related to the previous item, extended the API with commands to
divert collection of generated C code into memory\&. This makes it
easier to use the commands for embedded C code in higher-level code
generators\&.
.sp
See the section \fBAdvanced: Diversions\fR for details of
the provided commands\&.
.sp
The new package \fBcritcl::class\fR (see above) is a user
of these facilities\&.
.IP [7]
Extended the API with commands helping developers with the
generation of proper C \fI#line\fR directives\&. This allows
higher-level code generators to generate and insert their own
directives, ensuring that compile errors in their code are properly
attributed\&.
.sp
See the section \fBAdvanced: Location management\fR for
details of the provided commands\&.
.sp
The new packages \fBcritcl::iassoc\fR and
\fBcritcl::class\fR (see above) are users of these facilities\&.
.IP [8]
Extended the API with commands giving users the ability to
define custom argument and result types for \fB::critcl::cproc\fR\&.
.sp
See the section \fBAdvanced: Extending cproc\fR for
details of the provided commands\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.7"
.IP [1]
Fixed the code generated by \fBcritcl::c++command\fR\&.
The emitted code handed a non-static string table to
\fBTcl_GetIndexFromObj\fR, in violation of the contract, which
requires the table to have a fixed address\&. This was a memory
smash waiting to happen\&. Thanks to Brian Griffin for alrerting
us to the general problem\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.6"
.IP [1]
Fixed github issue 10\&. The critcl application now delivers a
proper exit code (1) on build failure, instead of always
indicating success (status 0)\&.
.IP [2]
Fixed github issue 13\&. Handling of bufferoverflowU\&.lib for
release builds was inconsistent with handling for debug
builds\&. It is now identically handled (conditional) by
both cases\&.
.IP [3]
Documentation cleanup, mainly in the installation guide, and
the README\&.md shown by github
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.5"
.IP [1]
Fixed bug in the new code for #line pragmas triggered when
specifying C code without leading whitespace\&.
.IP [2]
Extended the documentation to have manpages for the license,
source retrieval, installer, and developer's guides\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.4"
.IP [1]
Fixed generation of the package's initname when the incoming
code is read from stdin and has no proper path\&.
.IP [2]
Fixed github issue 11\&. Now using /LIBPATH instead of -L
on Windows (libinclude configuration setting)\&.
.IP [3]
Extended critcl to handle -l:path format of -l options\&.
GNU ld 2\&.22+ handles this by searching for the path as
is\&. Good when specifying static libraries, as plain -l looks
for shared libraries in preference over static\&. critcl handles
it now, as older GNU ld's do not understand it, nor the
various vendor-specific linkers\&.
.IP [4]
Fixed github issue #12\&. Critcl now determines the version of
MSVC in use and uses it to switch between various link debug
options\&. Simplified the handling of bufferoverflowU\&.lib also,
making use of the same mechanism and collapsing the two
configurations sections we had back into one\&.
.IP [5]
Reworked the insertion of #line pragmas into the generated C
code to avoid limitations on the line number argument imposed
by various compilers, and be more accurate\&.
.IP [6]
Modified argument processing\&. Option -libdir now also
implies -L for its argument\&.
.IP [7]
Extended handling of option -show (\fBcritcl::showconfig\fR)
to list the path of the configuration file the data is coming
from\&. Good for debugging configuration processing\&.
.IP [8]
Extended the build script with targets to regenerate the
embedded documentation, and diagrams, and to generate a
release\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.3"
.IP [1]
Fixed github issues 5 and 8, for the example build\&.tcl
scripts\&. Working around a missing variable ::errorInfo\&. It should
always be present, however there seem to be revisions of Tcl around
which violate this assumption\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.2"
.IP [1]
Fixed issue in compile-and-run mode where commands put into the
auto_index are not found by Tcl's [unknown] command\&.
.IP [2]
Fixed an array key mismatch breaking usage of client data and
delete function for procedure\&. Reported by Jos DeCoster, with patch\&.
.IP [3]
Implemented a command line option \fB-L\fR, an equivalent of
option \fB-I\fR, just for library search paths\&.
.IP [4]
Fixed github issues 5 and 8\&. Working around a missing variable
::errorInfo\&. It should always be present, however there seem to be
revisions of Tcl around which violate this assumption\&.
.PP
.SH "CHANGES FOR VERSION 3\&.0\&.1"
.IP [1]
Bugfixes all around\&. In detail:
.IP [2]
Fixed recording of Tcl version requirements\&. Keep package name
and version together, unbreaking generated meta data and generated
package load command\&.
.IP [3]
Fixed the build scripts: When installing, or wrapping for TEA,
generate any missing directories
.IP [4]
Modified the build scripts to properly exit the application
when the window of their GUI is closed through the (X) button\&.
.IP [5]
Removed an 8\&.5-ism (open wb) which had slipped into the main
build script\&.
.IP [6]
Modified the example build scripts to separate the output for
the different examples (and packages) by adding empty lines\&.
.IP [7]
stack::c example bugfix: Include API declarations for use in
the companion files\&.
.IP [8]
Extended the documentation: Noted the need for a working
installation of a C compiler\&.
.IP [9]
Extended the Windows target definitions and code to handle the
manifest files used by modern MS development environments\&. Note that
this code handles both possibilities, environment using manifests, and
(old(er)) environments without\&.
.IP [10]
Extended the Windows 64bit target definitions and code to
auto-detect the need for the helper library "bufferoverflowU\&.lib" and
reconfigure the compile and link commands appropriately\&. We assume
that the library must be linked when present\&. This should be no harm
if the library is present, yet not needed\&. Just superfluous\&. We search
for the library in the paths specified by the environment variable
LIB\&.
.PP
.SH "CHANGES FOR VERSION 3"
.IP [1]
The command \fBcritcl::platform\fR was deprecated in version
2\&.1, superceded by \fBcritcl::targetplatform\fR, yet kept for
compatibility\&. Now it has been removed\&.
.IP [2]
The command \fBcritcl::compiled\fR was kept with in version 2\&.1
with semantics in contradiction to its, for compatibility\&. This
contradiction has been removed, changing the visible semantics of the
command to be in line with its name\&.
.IP [3]
The change to version 3 became necessary because of the two
incompatible visible changes above\&.
.IP [4]
Extended the application package with code handling a new
option \fB-tea\fR\&. Specifying this option invokes a special mode
where critcl generates a TEA package, i\&.e\&. wraps the input into a
directory hierarchy and support files which provide it TEA-lookalike
buildsystem\&.
.sp
This new option, and \fB-pkg\fR, exclude each other\&. If
both are specified the last used option takes precedence\&.
.sp
The generated package directory hierarchy is mostly
self-contained, but not fully\&. It requires not only a working
installation of Tcl, but also working installations of the packages
\fBmd5\fR and \fBcmdline\fR\&. Both of these are provided by the
\fBTcllib\fR bundle\&. Not required, but recommended to have
installed are any of the packages which can accelerate md5's
operation, i\&.e\&. \fBcryptkit\fR, \fBtcllibc\fR, or
\fBTrf\fR\&.
.IP [5]
Extended the critcl package with a new command
\fBcritcl::scan\fR taking the path to a "\fI\&.critcl\fR" file,
statically scanning it, and returning license, version, a list of its
companion files, list of imported APIs, and list of
developer-specified custom configuration options\&. This data is the
foundation for the TEA wrapping described above\&.
.sp
Note that this is a \fIstatic\fR scan\&. While the other build
modes can (must) execute the "\fI\&.critcl\fR" file and make
platform-specific decisions regarding the assembled C code, companion
files, etc\&. the TEA wrap mode is not in a position to make
platform-specific decisions\&. It has to wrap everything which might
conceivably be needed when actually building\&. Hence the static scan\&.
This has however its own set of problems, namely the inability to
figure out any dynamic construction of companion file paths, at least
on its own\&. Thus:
.IP [6]
Extended the API used by critcl-based packages with the command
\fBcritcl::owns\fR\&. While this command is ignored by the regular build
modes the static scanner described above takes its arguments as the
names of companion files which have to be wrapped into the TEA package
and could not be figured by the scanner otherwise, like because of
dynamic paths to \fBcritcl::tsources\fR, \fBcritcl::csources\fR,
getting sourced directly, or simply being adjunct datafiles\&.
.IP [7]
Extended the API used by critcl-based packages with the command
\fBcritcl::api\fR for the management of stubs tables, be it their use,
and/or declaration and export\&.
.sp
Please see section \fIStubs Table Management\fR of the
\fBcritcl\fR package documentation for details\&.
.IP [8]
Extended the API used by critcl-based packages with the command
\fBcritcl::userconfig\fR for the management of developer-specified
custom configuration options, be it their use and/or declaration\&.
.sp
Please see section \fICustom Build Configuration\fR of the
\fBcritcl\fR package documentation for details\&.
.IP [9]
Extended the API used by critcl-based packages with the
commands \fBcritcl::description\fR, \fBcritcl::summary\fR,
\fBcritcl::subject\fR, \fBcritcl::meta\fR, and
\fBcritcl::buildrequirement\fR for the declaration of TEApot meta data
for/about the package\&.
.sp
Please see section \fIPackage Meta Data\fR of the
\fBcritcl\fR package documentation for details\&.
.PP
.SH "CHANGES FOR VERSION 2\&.1"
.IP [1]
Fixed bug where \fBcritcl::tsources\fR interpreted relative
paths as relative to the current working directory instead of
relative to the "\fI\&.critcl\fR" file using the command, as all other
commands of this type do\&.
.IP [2]
Fixed internals, preventing information collected for multiple
"\fI\&.critcl\fR" files to leak between them\&. Notably, \fBcritcl::tk\fR
is not a global configuration option anymore\&.
.IP [3]
Fixed the command \fBcritcl::license\fR to be a null-operation
in mode "compile & run", instead of throwing an error\&.
.IP [4]
Fixed the critcl application's interference with the "compile &
run" result cache in \fB-pkg\fR mode by having it use a wholly
separate (and by default transient) directory for that mode\&.
.IP [5]
Fixed bug where changes to a "\fI\&.critcl\fR" file did not result
in a rebuild for mode "compile & run"\&. All relevant API commands now
ensure UUID changes\&.
.IP [6]
Fixed bug in the backend handling of \fBcritcl::debug\fR where
the companion c-sources of a "\fI\&.critcl\fR" file were not compiled
with debug options, although the "\fI\&.critcl\fR" file was\&.
.IP [7]
Fixed bug in \fBcritcl::debug\fR which prevented recognition of
mode "all" when it was not the first argument to the command\&.
.IP [8]
Fixed bug in "\fIpreload\&.c\fR" preventing its compilation on
non-windows platforms\&.
.IP [9]
Fixed long-standing bug in the handling of namespace qualifiers
in the command name argument of \fBcritcl::cproc\fR and
\fBcritcl::ccommand\fR\&. It is now possible to specify a fully
qualified command name without issues\&.
.IP [10]
Extended/reworked \fBcritcl::tsources\fR to be the canonical
way of declaring "\fI\&.tcl\fR" companion files even for mode "compile &
run"\&.
.IP [11]
Extended/reworked \fBcritcl::tsources\fR to allow the use of a
"\fI\&.critcl\fR" file as its own Tcl companion file\&.
.IP [12]
Extended \fBcritcl::framework\fR to internally check for OS X
build target, and to ignore the declaration if its not\&.
.IP [13]
Extended \fBcritcl::failed\fR to be callable more than once in
a "\fI\&.critcl\fR" file\&. The first call forces the build, if it was not
done already, to get the result\&. Further calls return the cached
result of the first call\&.
.IP [14]
Extended the handling of environment variable CC in the code
determining the compiler to use to deal with (i\&.e\&. remove) paths to
the compiler, compiler file extensions, and compiler options specified
after the compiler itself, leaving only the bare name of the compiler\&.
.IP [15]
Extended the code handling the search for preloaded libraries
to print the paths it searched, making debugging of a search failure
easier\&.
.IP [16]
A new command \fBcritcl::tcl\fR can be used to declare the
version of Tcl minimally needed to build and run the "\fI\&.critcl\fR"
file and package\&. Defaults to 8\&.4 if not declared\&. Extended critcl to
have the stubs and headers for all of Tcl 8\&.4, 8\&.5, and 8\&.6\&.
.IP [17]
A new command \fBcritcl::load\fR forces the build and load of a
"\fI\&.critcl\fR" file\&. This is the official way for overriding critcl's
default lazy-build-&-load-on-demand scheme for mode "compile & run"\&.
.sp
\fINote\fR that after using \fBcritcl::load\fR /
\fBcritcl::failed\fR in a "\fI\&.critcl\fR" file it is not possible to
use critcl commands in that file anymore\&. Doing so will throw an
error\&.
.IP [18]
Extended the generation of '#line' pragmas to use
\fBinfo frame\fR (if available) to provide the C compiler with exact
line numbers into the "\fI\&.critcl\fR" file for the reporting of
warnings and errors\&.
.IP [19]
Extended \fBcritcl::check\fR with logging to help with
debugging build-time checks of the environment, plus an additional
optional argument to provide labeling\&.
.IP [20]
Added a new command \fBcritcl::checklink\fR which not only
tries to check the environment via compiling the code, but also
its linkability\&.
.IP [21]
Added a new command \fBcritcl::msg\fR for messaging, like
command \fBcritcl::error\fR is for error reporting\&. Likewise this is a
hook a user of the package is allowed to override\&. The default
implementation, used by mode \fIcompile & run\fR does nothing\&. The
implementation for mode \fIgenerate package\fR prints the message
to stdout\&.
.sp
Envisioned use is for the reporting of results determined by
\fBcritcl::check\fR and \fBcritcl::checklink\fR during building, to
help with debugging when something goes wrong with a check\&.
.IP [22]
Exposed the argument processing internals of \fBcritcl::proc\fR
for use by advanced users\&. The new commands are
.RS
.IP [1]
\fBcritcl::argnames\fR
.IP [2]
\fBcritcl::argcnames\fR
.IP [3]
\fBcritcl::argcsignature\fR
.IP [4]
\fBcritcl::argvardecls\fR
.IP [5]
\fBcritcl::argconversion\fR
.RE
.IP
Please see section \fIAdvanced Embedded C Code\fR of the
\fBcritcl\fR package documentation for details\&.
.IP [23]
Extended the critcl package to intercept \fBpackage
provide\fR and record the file -> package name mapping\&. Plus other
internal changes now allow the use of namespaced package names while
still using proper path names and init function\&.
.IP [24]
Dropped the unused commands \fBcritcl::optimize\fR and
\fBcritcl::include\fR\&.
.IP [25]
Dropped \fB-lib\fR mode from the critcl application\&.
.IP [26]
Dropped remnants of support for Tcl 8\&.3 and before\&.
.PP
.SH AUTHORS
Jean Claude Wippler, Steve Landers, Andreas Kupries
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report them at \fIhttps://github\&.com/andreas-kupries/critcl/issues\fR\&.
Ideas for enhancements you may have for either package, application,
and/or the documentation are also very welcome and should be reported
at \fIhttps://github\&.com/andreas-kupries/critcl/issues\fR as well\&.
.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) Jean-Claude Wippler
Copyright (c) Steve Landers
Copyright (c) 2011-2015 Andreas Kupries

.fi