Auto-generated XML interfaces and dependencies

[Thomas McGuire]

Hello,

recently I changed the XML D-Bus interface from being hand-written to being 
auto-generated by calling qt4_generate_dbus_interface on the kmkernel.h 
header file.
Other applications in KDEPIM also use this XML interface, for example 
KOrganizer does with 
>qt4_add_dbus_interfaces(korganizer_eventviewer_LIB_SRCS 
${CMAKE_BINARY_DIR}/kmail/org.kde.kmail.kmail.xml)

This means KOrganizer needs the XML file from KMail's build directory. It 
seems that this creates problems with parallel builds, where things like
> No rule to make target `kmail/org.kde.kmail.kmail.xml', needed by 
`kontact/plugins/kmail/kmailinterface.cpp
happen.

One workaround is to manually add dependencies to KMail, for example with 
>add_dependencies(korganizer_eventviewer kmail)
This is not very elegant, and it reduces the parallelism.

Has anybody got a better solution for this problem? David Faure suggested to 
move the call of qt4_generate_dbus_interface to the toplevel CMake file of 
KDEPIM instead of KMail's. Is this a sound solution?

Regards,
Thomas