Using Magick++ in Qt Creator

Question

I am creating a Qt widget with a backend representation I wrote separately. The backend uses Magick++, and I can get it to compile from the command line:

g++ -c ../SpriteCreator/WriteGIF.cpp sprite.cpp -I ../SpriteCreator/ Magick++-config --cxxflags --cppflags Magick++-config --ldflags --libs -O2

but when I try to compile the project Qt Creator it tells me

/home/tpope/obeyYourThirst/qtSpriteEditor/backend/sprite.cpp:15: error: Magick++.h: No such file or directory #include < Magick++.h>

I added the path for Magick++.h to the INCLUDEPATH, but now it has an error similar to this:

/home/tpope/obeyYourThirst/qtSpriteEditor/backend/sprite.cpp:66: error: undefined reference to `Magick::InitializeMagick(char const*)'

for every use of a Magick function. It seems to be not including the library. How do I do that in Qt Creator?

You need to put the Magick++-config stuff inside $() like this... $(Magick++-config --cxxflags --cppflags --ldflags --libs) to actually execute them, — Mark Setchell
– Mark Setchell, Commented Nov 11, 2015 at 20:34
They were in backquotes in my makefile, but the markdown apparently removed those. It works in my makefile. How do I get Qt Creator to execute them? — Taylor Pope
– Taylor Pope, Commented Nov 11, 2015 at 21:50
As a temporary fix, run the Magick++-config... -- ... --ldflags --libs command I gave above in your Terminal, and copy and paste the output into your Qt Creator Makefile and see if that fixes it for now. — Mark Setchell
– Mark Setchell, Commented Nov 11, 2015 at 22:14
I just did that, and it worked. Thanks! I still wish I could get Qt Creator to simply run $(Magick++-config --cxxflags --cppflags --ldflags --libs) though. — Taylor Pope
– Taylor Pope, Commented Nov 11, 2015 at 22:37

Sompom · Accepted Answer · 2016-04-07 20:51:22Z

Since the .pro files in Qt Creator is (as far as I can tell) used to generate a Makefile, we can use make's ability to run a program on the shell and save its output.

I have added:

QMAKE_CXXFLAGS += $(shell Magick++-config --cppflags --cxxflags)

and

LIBS += $(shell Magick++-config --ldflags --libs)

to my .pro file, and I was able to add:

#include <Magick++.h>

to my program without a compile error, then compile a simple example (Just put out an animated .gif with a couple of colored pixels)

This obviously makes things like cross-compiling a little tricky (I don't know how to reference foreign libraries), but that's a problem for another time.

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