qmake pre-build step before ANY compilation

by

Another option would be to start with the project file snippet in your original question, and also ensure that qmake is aware that versioning.h is a dependency for the other build targets in your project file —

  • Add the full path to versioning.h to your HEADERS variable.
  • Add the folder in which versioning.h resides to your DEPENDPATH variable.

(Caveat: if you run qmake when versioning.h doesn’t exist, it will emit “WARNING: Failure to find: versioning.h” — the only workaround for that warning is to use the system() command, as I described in my other answer.)

Example

Create test.pro containing the following:

versionTarget.target = ../versioning.h
versionTarget.depends = FORCE
versionTarget.commands = sleep 5s ; touch ../versioning.h
PRE_TARGETDEPS += ../versioning.h
QMAKE_EXTRA_TARGETS += versionTarget

SOURCES = test.c
HEADERS = ../versioning.h
DEPENDPATH = ..

Create test.c containing the following:

#include "../versioning.h"

Run qmake. It will output WARNING: Failure to find: ../versioning.h.

Run make -j9. It will run versionTarget.commands (which sleeps for 5 seconds to exaggerate any multiprocessing problems), and, after that is done, run the command to compile test.c.

(And if you examine the generated Makefile, you’ll see that test.o depends on both test.c and ../versioning.h, so Make should correctly figure out that it can’t run the command to compile test.c before the command to create/update ../versioning.h.)

More Related Contents:

  1. How to specify different Debug/Release output directories in QMake .pro file
  2. QMake – how to copy a file to the output
  3. How to use QMake’s subdirs template?
  4. QMake – How to add and use a variable into the .pro file
  5. Add a define to qmake WITH a value?
  6. C++ Qt – How to add “-std=c++11” to the makefile which is generated by qmake?
  7. How to convert qmake to cmake?
  8. Running a program/script from QMake
  9. How to execute shell command after compile finished from .pro in QT?
  10. Which yocto is best for me
  11. Qt Stylesheet for custom widget
  12. Draw Rectangular overlay on QWidget at click
  13. How delete and deleteLater works with regards to signals and slots in Qt?
  14. Undefined reference to vtable. Trying to compile a Qt project
  15. How to set application’s taskbar icon in Windows 7
  16. How to Include OpenSSL in a Qt project
  17. How to build Qt 4.8/5.2 statically under VS2012, using the static MSVC runtime, with Windows XP support?
  18. Access sqlite from a remote server
  19. Understanding form layout mechanisms in Qt
  20. How to make a column in QTableWidget read only?
  21. Why does calling quit() before exec() not quit the application?
  22. Where does Qt Creator save its settings?
  23. How do i resize the contents of a QScrollArea as more widgets are placed inside
  24. How to get STDOUT from a QProcess?
  25. Why should nesting of QEventLoops be avoided?
  26. Qmake: how to remove compiler flag for a certain project, without changing qmake.conf?
  27. Deploy Qt5 QML application
  28. How can I detect a hang in QEventLoop?
  29. Dynamic instantiation of QML objects?
  30. Different delegates for QML ListView

Leave a Comment