1. Empty() now doesn't free memory - Clear() does

[wxWidgets.git] / docs / gtk / install.txt

* The most simple case
-----------------------

If you compile wxWindows on Unix for the first time and don't like
to read install instructions just do (in the base dir):

./configure --without-threads
make

and drink 10 coffees. Then you may log in as root and type

make install

You can leave out the --without-threads option if you have a NEW
Linux distribution based on glibc (e.g. RedHat 5.1 or Debian 2.0) 
or any other Unix that comes with Posix threads or SGI threads.

Now create your super-application myfoo.app and compile anywhere with

g++ myfoo.cpp `wx-config --libs` `wx-config --cflags` -o myfoo

* General
-----------------------

The Unix variants of wxWindows use GNU configure. If you have problems 
with your make use GNU make instead.

Read my homepage at 

  http://wesley.informatik.uni-freiburg.de/~wxxt
  
for newest information.

* GUI libraries
-----------------------

wxWindows/GTK requires the GTK+ library to be installed on your system.
It has to be a stable version, preferebly version 1.0.6. When using
a version previous to 1.0.6 you'll get crashes here and there. This
is certain to happen with colors in native widgets.

You can get the newest version of the GTK+ from the GTK homepage
at
  http://www.gtk.org
  
We also mirror GTK+ 1.0.6 at our ftp site. You'll find information
about downloading at my homepage.
  
* Additional libraries
-----------------------

wxWindows/Gtk requires a thread library and X libraries
known to work with threads. This is the case on all
commercial Unix-Variants and all Linux-Versions that
are based on glibc 2 except RedHat 5.0 which is broken
in many aspects. As of writing this, these Linux 
distributions have correct glibc 2 support:

 - RedHat 5.1
 - Debian 2.0
 - Stampede
 
The next major version of SuSE will also support glibc 2,
but version 5.X does not. Also Caldera and Slackware
don't yet support glibc 2.

On IRIX you can also use SGI threads if Posix-Threads
are not present. The SGI threads will be detected by
configure automatically.

You can always disable thread support by running 

./configure "--without-threads"
make clean
make
  
NB: I included thread support in wxWindows/Gtk, as this 
problem will disappear in the near future when all major 
Linux Variants have moved to glibc 2. Also, the Linux
Base Standard will include glibc 2.

* Create your configuration
-----------------------------

Usage:
	./configure options

If you want to use system's C and C++ compiler,
set environment variables CC and CCC as

	% setenv CC cc
	% setenv CCC CC
	% ./configure options

Using the SGI native compilers, it is recommended that you
also set CFLAGS and CXXFLAGS before running configure. These 
should be set to :

CFLAGS="-mips3 -n32" 
CXXFLAGS="-mips3 -n32"

This is essential if you want to use the resultant binaries 
on any other machine than the one it was compiled on. If you 
have a 64bit machine (Octane) you should also do this to ensure 
you don't accidently build the libraries as 64bit (which is 
untested).

The SGI native compiler support has only been tested on Irix 6.5.

to see all the options please use:

	./configure --help

The basic philosophy is that if you want to use different
configurations, like a debug and a release version, 
or use the same source tree on different systems,
you have only to change the environment variable OSTYPE.
(Sadly this variable is not set by default on some systems
in some shells - on SGI's for example). So you will have to 
set it there. This variable HAS to be set before starting 
configure, so that it knows which system it tries to 
configure for.

Configure will complain if the system variable OSTYPE has 
not been defined. And Make in some circumstances as well...


* General options
-------------------

Normally, you won't have to choose a toolkit, because when
you download wxGTK, it will default to --with-gtk etc. But
if you use all of our CVS repository you have to choose a 
toolkit. You must do this by running configure with either of:

        --with-gtk               Use the GIMP ToolKit (GTK)
	
	--with-qt                Use Qt from TrollTec
	
	--with-motif             Use either Motif or Lesstif
	                         Configure will look for both. 

The following options handle the kind of library you want to build.

	--without-threads       Compile without thread support.

	--without-shared        Do not create shared libraries.

	--without-optimise	Do not optimise the code.

	--with-profile          Add profiling info to the object 
				files. Currently broken, I think.
				
	--with-mem_tracing      Add built-in memory tracing. 
	                        This doesn't work well with gcc.
				
	--with-dmalloc          Use the dmalloc memory debugger.
	                        Read more at www.letters.com/dmalloc/
				
	--with-debug_info	Add debug info to object files and
	                        executables.

	--with-debug_flag	Define __DEBUG__ and __WXDEBUG__ when
	                        compiling.

* Feature Options
-------------------

As I don't yet care for binary size and target mainly at
producing a shared library, wxWindows's configure system auto-
matically enables all features, as long as they are already
implemented. It is currently NOT possible to disable these
options (in contrast to what configure tells you).

* Compiling
-------------

The following must be done in the base directory (e.g. ~/wxGTK
or ~/wxWin or whatever)

Now the makefiles are created and you can compile everything 
by typing:

	make

make yourself some coffee, as it will try to compile ALL the 
files in this distribution. During compilation, you'll get
a few warning messages.

if you want to be more selective:

	make src	will build only the base libraries
	make samples	will build the samples
	make other	will build everything in other
	make user	will build everything in user

Then you may install the library and it's header files under
/usr/local/include/wx and /usr/local/lib respectively. You
have to log in as root (i.e. run "su" and enter the root
password) and type

        make install	
	
Depending on the configuration of some files, the libraries
and binaries will be placed in different directories.
The "global" binaries and libraries will be placed in:

	bin/$(OSTYPE) and
	lib/$(OSTYPE) respectively

"local" binaries and libraries will be placed in:

	(basedir of that application)/$(OSTYPE).

This is also the place where all the object-files will go.

If you want to conserve disk space by removing unnecessary
object-files:

	 make clean_obj

will do the work for you.

* Creating a new Project
--------------------------

There are two ways to create your own project:

1) The first way uses the installed libraries and header files
automatically using wx-config

g++ myfoo.cpp `wx-config --libs` `wx-config --cflags` -o myfoo

Using this way, a make file for the minimal sample would look
like this

CC = g++

minimal: minimal.o
    $(CC) -o minimal minimal.o `wx-config --libs` 

minimal.o: minimal.cpp mondrian.xpm
    $(CC) `wx-config --cflags` -c minimal.cpp -o minimal.o

clean: 
	rm -f *.o minimal

This is certain to become the standard way unless we decide
to sitch to tmake.

2) The other way creates a project within the source code 
directories of wxWindows: In this case I propose to put 
all contributed programs in the directory "/user", with a 
directory of its own.

This directory then should include the following files:

Makefile        (You can copy this one from any application in samples
                 probably you will not need to edit this one. There is
                 only one case where you might be interested in changing
                 this file, but about that see later.)
Makefile.in	(This is the base application-Makefile template, from
                 which the actual Makefile for each system is created.
                 More about this later)

put ALL your source code along with all the other stuff you need for
your application in this directory (subdirectories are welcome).


** Something about Makefiles
------------------------------

On general principle it should only contain ONE line, which is as follows:

	include ../../setup/general/makeapp

this will include all the necessary definitions for creating the applications

the only case where you might want to add another line is the following:
this version of configure also supports creation of source archives of the
application for easy distribution and updates to newer version of wxWindows.
    For this purpose all files in the application-directory will be put into
a gziped tar-file in the full notation user/<your application>/*
if you want to include some other files that you want "more visible", like
a README.<yourApp> or a shell script for easy 
compilation/installation/distribution, then you have to add a variable

	DISTRIBUTE_ADDITIONAL=<your files>

to the Makefile.
So it would look like this:

	DISTRIBUTE_ADDITIONAL=README.TheApp
	include ../../setup/general/makeapp

As we have already talked about distribution the command to create a 
distribution is:

	make distrib

NOTE: If you are in the base directory of wxWindows it will create 
distribution packages for wxWindows as well as for all packages in the
user directory.
    So if you want to create only packages for the files in user,
then go to the directory other and type:

	make distrib

or if you only want one application to be created then
enter the specific directory and type there:
make distrib

All the distribution files will be put in the directory
distrib at the base of the wxWindows-tree (where also configure
and template.mak can be found).

** Something about Makefile.in
--------------------------------

As you have already seen with Makefile, configure makes a lot of use
if the include statement in make to keep the Makefiles as simple as 
possible.

So basically there are only variables to define and then a include command.
Exception to this rule is if you have special rules for some stuff...
These rules should go AFTER the include statement!!!

so the general header looks like this:

	# wxWindows base directory
	WXBASEDIR=@WXBASEDIR@
	# set the OS type for compilation
	OS=@OS@
	# compile a library only
	RULE=bin

and the general footer will look like this:

	# include the definitions now
	include ../../../template.mak

the key variable is RULE, which defines what make should create
in this directory.

here are some examples:

  RULE	  description              
  ===========================================================================
  bin	  creates a local binary (for a global binary prefix bin with g)
  	  additional variables needed:
  		BIN_TARGET	this gives the name of your application
  		BIN_OBJ		this gives the object files needed to
  				link the application
  	  optional variables are:
  		BIN_SRC		this gives the list of c/c++ files for
  				which dependencies will be checked.
  				(This can be achieved with: make depend)
  		BIN_LINK	this gives commands for additional
  				libraries needed to link the application
  ---------------------------------------------------------------------------
  bin2	  creates two local binaries (for global binaries prefix bin2 with g)
  	  in addition to the variables specified above you MUST also
  	  provide the same variables with BIN2_ instead of BIN_
  ---------------------------------------------------------------------------
  lib	  creates a local library (for a global binary prefix bin with g)
  	  additional variables needed:
  		LIB_TARGET	this gives the name of your library
  		LIB_OBJ		this gives the object files needed for
  				the library to be build.
  	  optional variables are:
  		LIB_SRC		this gives the list of c/c++ files for
  				which dependencies will be checked.
  	  libbin and libgbin are also possible and will need in addition
  	  the variables from bin
  ---------------------------------------------------------------------------
  gslib	  is similar to lib, but it creates a shared library if the system
  	  supports it.
  	  additional variables needed:
  		LIB_MAJOR	major number of the shared library
  		LIB_MINOR	minor number of the shared library
  ---------------------------------------------------------------------------
  other additional variables:

  	  ADD_COMPILE	   define additional includes/defines that
  			   are needed to compile the object files
  			   (if you need to reference some directory
  			   utils - like wxGrid -, then please 
  			   reference them with the variables defined
  			   in template.mak - e.g.: $(SRCDIR),$(UTILS),
  			   $(SAMPLES),$(OTHERS))

  	  NEEDED_DEFINES   lists all the defines that HAVE to be set in
  			   /include/wx/setup.h to compile correctly.

	  SRC_DIR	   lists all directories that are needed to
			   compile. (i.e: lists all the directories,
			   where there are source-files.) But it is 
			   also needed to clean an object and for 
			   machines, for which make does not support 
			   VPATH

currently there are the following compiling rules provided:
object files are created for the following file extensions:
.c .cc .cpp

Please have a closer look at the Makefiles in this distribution.

* Platforms configure is working with
---------------------------------------

Please report build succes on any machine. Especially non-
Linux operating systems (which I don't have).

Original author of the autoconf system for wxxt-1.66 and for this INSTALL
file:

	Martin Sperl	sperl@dsn.ast.univie.ac.at
	
Ported to wxGTK 0.1:

	Wolfram Gloger  wmglo@dent.med.uni-muenchen.de

Thanks alot to both of them.

In the hope that it will be useful,

        Robert Roebling roebling@sun2.ruf.uni-freiburg.de