88 lines
3.4 KiB
Markdown
88 lines
3.4 KiB
Markdown
How to add a new `wxUSE_XXX` preprocessor constant
|
|
================================================
|
|
|
|
0. Purpose
|
|
----------
|
|
|
|
Detailed description of what needs to be done when you want to add a new
|
|
`wxUSE_XXX` compilation flag. The text below assumes you need new `wxUSE_FOO`.
|
|
|
|
|
|
1. Overview
|
|
-----------
|
|
|
|
wxWidgets uses `wxUSE_XXX` macros for conditionally compiling in (or not)
|
|
optional components. In general, whenever a new non critical (i.e. not
|
|
absolutely required by important parts of the library) class Foo is added it
|
|
should use its own `wxUSE_FOO` compilation flag.
|
|
|
|
`wxUSE_FOO` must be always defined and have value of 0 or 1. Be careful with
|
|
testing for it in wx/foo.h: don't do it at the very beginning of the file
|
|
because then `wxUSE_FOO` would be not defined at all if the user directly
|
|
includes wx/foo.h, include "wx/defs.h" before testing for `wxUSE_FOO`.
|
|
|
|
|
|
2. Files to update
|
|
------------------
|
|
|
|
The following files need to be modified when adding a new `wxUSE_FOO`:
|
|
|
|
a) include/wx/setup_inc.h
|
|
|
|
This file contains all common `wxUSE_XXXs`, and is used to update wxMSW, wxMac
|
|
setup.h and Unix setup.h.in using build/update-setup-h. Please try to add
|
|
the new define in a logical place (i.e. near any related ones) and write a
|
|
detailed comment explaining what does it do and why would you want to turn
|
|
it on/off. Choose the appropriate default value: this should be usually 1
|
|
but can be 0 if there are some problems preventing the use of Foo by default
|
|
(e.g. it requires installation of some non standard 3rd party libraries).
|
|
After changing this file, run the update-setup-h script (this is probably
|
|
better done on a Unix machine although it should work under Cygwin too).
|
|
|
|
a') include/wx/msw/setup_inc.h for MSW-specific options
|
|
|
|
This file contains MSW-specific options, so if the new option is only used
|
|
under MSW, add it here instead of include/wx/setup_inc.h. The rest of the
|
|
instructions is the same as above.
|
|
|
|
b) include/wx/chkconf.h
|
|
|
|
Add the check for `wxUSE_FOO` definedness in the corresponding (base or GUI)
|
|
section. Please keep the alphabetic order.
|
|
|
|
If there are any dependencies, i.e. `wxUSE_FOO` requires `wxUSE_BAR` and
|
|
`wxUSE_BAZ`, check for thme here too.
|
|
|
|
b') include/wx/msw/chkconf.h for MSW-specific options
|
|
|
|
These options won't be defined for the other ports, so shouldn't be added to
|
|
the common include/wx/chkconf.h but to this file instead.
|
|
|
|
c) configure.in
|
|
|
|
Here you need to add `DEFAULT_wxUSE_FOO` define. It should be added in the
|
|
block beginning after WX_ARG_CACHE_INIT line and should default to "no" for
|
|
"if DEBUG_CONFIGURE = 1" branch (this is used for absolutely minimal builds)
|
|
and the same as default value in setup_inc.h in the "else" branch.
|
|
|
|
You also need to add a WX_ARG_ENABLE (or, if new functionality can be
|
|
reasonably described as support for a 3rd party library, WX_ARG_WITH)
|
|
line togetherw with all the existing WX_ARG_ENABLEs.
|
|
|
|
If you have a sample/foo which should be only built when `wxUSE_FOO==1`,
|
|
then only add it to the SAMPLES_SUBDIRS if `wxUSE_FOO=yes` in configure.
|
|
|
|
d) build/cmake/options.cmake
|
|
|
|
To include the option in CMake, add a new line in the appropriate
|
|
section of options.cmake.
|
|
|
|
wx_option(wxUSE_FOO "enable FOO")
|
|
|
|
As an optional third parameter you may specify `OFF` when the option
|
|
should be disabled by default.
|
|
|
|
e) docs/doxygen/mainpages/const_wxusedef.h
|
|
|
|
Add a brief description of the new constant.
|