This function calculates the topological order of variables.
We will use it to determine which and in what order to link
module libraries.
The function is not tied to libraries/modules only, but requires
the variables to be ordered to have their dependencies in the
[prefix]<var>.depends subvariable.
Due to the recursive nature of the algorithm it was just much easier
to implement it directly in C++ rather than in a qmake-language
function.
The module specific pris define the modules
name
version
dependencies
include paths
lib paths
additional CONFIGs and DEFINES
They are located in the modules source directory, with fwd
includes created in QtBase/mkspecs/modules build directory.
The pris use
QT_MODULE_INCLUDE_BASE
QT_MODULE_LIB_BASE
to specify the locations for includes and libs. These paths
are normally based on
QT_INSTALL_HEADERS
QT_INSTALL_LIBS
for installed modules, but overridden to the module's build
directory by syncqt for the fwd included pris.
The path of the pris must be specified in the sync.profile
for syncqt to create the fwding pris in QtBase.
This will normally only happen for top-level pro files,
and syncqt is smart enough to not touch already existing
files. And in edition, syncqt uses the original file's
timestamp on the fwding files.
This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:
http://qt.gitorious.org/qt/pages/GitIntroductionWithQt
If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.
Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
