Well, I have the strangest of solutions that isn’t clean, pretty, or even
explainable (by me).
Consider these extra rules (linux only) so the complete .pro file looks like
this:
TEMPLATE = app
SOURCES += main.cpp
OBJ_SOURCE = dummy_input_file.txt
OBJ_GENERATOR.CONFIG += no_link target_predeps
OBJ_GENERATOR.output = ${QMAKE_FILE_BASE}_QObject.h
OBJ_GENERATOR.commands = ./generate_a_file.py ${QMAKE_FILE_OUT}
OBJ_GENERATOR.input = OBJ_SOURCE
OBJ_GENERATOR.variable_out = HEADERS
QMAKE_EXTRA_COMPILERS += OBJ_GENERATOR
PRO_FILE_TOUCHER.CONFIG += no_link target_predeps
PRO_FILE_TOUCHER.output = .lmp_${QMAKE_FILE_BASE}_generated
PRO_FILE_TOUCHER.commands = touch $$_PRO_FILE_ ${QMAKE_FILE_OUT} && $(MAKE) &&
exit 1
PRO_FILE_TOUCHER.input = OBJ_SOURCE
QMAKE_EXTRA_COMPILERS += PRO_FILE_TOUCHER
OBJECTS_DIR=.o
MOC_DIR=.moc
That is, the first time that make runs, it touches the .pro file as well as
.lmp_dummy_input_file_generated, then re-runs make.
Here’s what I don’t understand: when those commands are followed by “exit 1”
then for some reason the “new” version of the Makefile gets used in the rest of
the build commands, whereas if “exit 0” is used, then in the Makefile, OBJECTS
does not contain .o/moc_dummy_input_file_QObject.o and linking fails …
So, this all seems extremely hackish, and make still returns with a non-zero
value (like it does when linking fails) but now in this case it actually has
succeeded … blech.
Glen
> On Feb 13, 2017, at 12:04 PM, Glen Mabey <[email protected]> wrote:
>
> Hello,
>
> I think I’ve got the exact problem described here back in 2012:
> https://forum.qt.io/topic/21964/qmake-custom-compilers-how-to-process-generated-header-files-with-moc
>
> That is, my generated header file includes a class that inherits from QObject
> and needs to be moc'ed.
>
> However, these lines are not sufficient to make that happen the first time
> the project is built:
>
> OBJ_SOURCE = dummy_input_file.txt
>
> OBJ_GENERATOR.CONFIG += no_link target_predeps
> OBJ_GENERATOR.output = ${QMAKE_FILE_BASE}_QObject.h
> OBJ_GENERATOR.commands = ./generate_a_file.py ${QMAKE_FILE_OUT}
> OBJ_GENERATOR.input = OBJ_SOURCE
> OBJ_GENERATOR.variable_out = HEADERS
> QMAKE_EXTRA_COMPILERS += OBJ_GENERATOR
>
>
> That is, the project fails to link due to undefined references.
>
> If I rerun qmake and build again, though, everything works out fine.
>
> Any suggestions?
> Glen
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