How do a specify a library file dependency for qmake in Qt?

Question

Have a SomeLib.pro file that contains:

CONFIG  += debug
TEMPLATE = lib
TARGET = SomeLib
..

Then in a dependent SomeApp.pro:

..
debug:LIBS += -lSomeLib_debug
..

How can I force SomeApp to build if I touched SomeLib in qmake?

I'm making use of qtcreator. Thus I was hoping for a solution in a .pro file. — Derick Schoonbee, Apr 23 '09 at 13:17

score 16 · Accepted Answer · answered Apr 23 '09 at 22:07

16

It's ugly because you need to give the exact library file name, but this should work:

TARGETDEPS += libfoo.a

answered Apr 23 '09 at 22:07

Ariya Hidayat

12,523
3
46
39

1

Use PRE_TARGETDEPS instead. – Sergey Skoblikov Feb 13 '13 at 16:34
3

That's not ugly - implicitly prepending `lib` to everything is ugly - libzlib anyone? – Timmmm Jul 15 '15 at 17:49

pi3 · Answer 2 · 2013-05-20T08:38:05.717

3

QT Creator will do the work if you click "Add library..." in the context menu of the project that should include the library.

These variables are configured automatically for you:

LIBS
INCLUDEPATH
DEPENDPATH
PRE_TARGETDEPS

See also http://doc.qt.digia.com/qtcreator-2.1/creator-project-qmake-libraries.html

edited May 20 '13 at 08:38

answered May 20 '13 at 08:19

pi3

1,235
13
15

score 2 · Answer 3 · answered May 10 '09 at 13:53

2

In reply to Zahir's comment, it's perhaps worth pointing out that stating this dependency in qmake files is unnecessary if using DLLs, but is essential if your exe depends on a static library.

answered May 10 '09 at 13:53

Clare Macrae

3,670
2
31
45

score 1 · Answer 4 · edited Sep 15 '09 at 23:13

1

I used:

POST_TARGETDEPS += c:/open-en/lib/win32mingw/libosal_based.a

It works, but is clumsy since it is necessary specify full path to library, which is different for every operating system/compiler.

edited Sep 15 '09 at 23:13

sth

222,467
53
283
367

answered Sep 15 '09 at 15:31

score 1 · Answer 5 · answered Apr 23 '09 at 12:58

1

qmake does not provide this ability.

Instead, put your app and lib in subdirectories, then create a Makefile in their parent directory that looks something like this:

all: FRC
    cd Somelib && qmake && $(MAKE) 
    cd SomeApp && qmake && $(MAKE)

FRC:

Then always run make from this directory.

answered Apr 23 '09 at 12:58

Mark Beckwith

1,942
1
18
22

1

I'm making use of qtcreator. Thus I was hoping for a solution in a .pro file. – Derick Schoonbee Apr 23 '09 at 13:32

score 0 · Answer 6 · answered Apr 23 '09 at 12:47

surely that can't be possible, you are talking about using qmake to do a reverse dependency lookup? so what u want is for it to build app B (and any other app dependent on library A) after you've made a change to library A?

that's a bit like saying recompile all visual basic apps if vbrun300.dll is updated?

How do a specify a library file dependency for qmake in Qt?

6 Answers6

Linked