How to build wxWidgetsets project using Qt Creator?

[Christian Ehrlicher]

You don't link against the wxwidgets libraries so the linker can't find the symbols.
See LIBS for qmake and target_link_libraries() for cmake.

[Kobid]

I don't need to because I have compiled wxWidgets using --disable-shared, this options come from wx-config --cflags --libs but it should be appended at the end for g++ and I don't know how to do it

[Christian Ehrlicher]

@Kobid said in How to build wxWidgetsets project using Qt Creator?:

I don't need to because I have compiled wxWidgets using --disable-shared

This just means you compiled wxwidgets as static lib. You have to link against them if you want to use symbols from there.

[Kobid]

Yes, all -L comes from wx-config shell, I think I don't need do this by my self, I mean I didn't have to in CodeBlocks, CodeLite and Visual Studio Code. I think problem is with args order. When I change this (this is how Qt Creator pass it to gcc) from:

/bin/g++ -DQT_QML_DEBUG `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags --libs` -g  CMakeFiles/SimpleBackupWX2.dir/SimpleBackupMain.cpp.o CMakeFiles/SimpleBackupWX2.dir/ZipProcess.cpp.o CMakeFiles/SimpleBackupWX2.dir/SimpleBackupApp.cpp.o -o SimpleBackupWX2

to (I change it in console of course):

/bin/g++ -DQT_QML_DEBUG -g  CMakeFiles/SimpleBackupWX2.dir/SimpleBackupMain.cpp.o CMakeFiles/SimpleBackupWX2.dir/ZipProcess.cpp.o CMakeFiles/SimpleBackupWX2.dir/SimpleBackupApp.cpp.o -o SimpleBackupWX2 `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags --libs`

then my project is compiling fine

[Kobid]

For example, in Visual Studio Code this is how I'm preparing tasks.json which is responsible for building my wxWidgetsets project using g++ and it simply works and even debugging works in this IDE, I don't need to link anything, wx-config is the last argument:

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++ kompiluj aktywny plik",
            "command": "/usr/bin/g++",
            "args": [
                "-fdiagnostics-color=always",
                "-g",
                "${fileDirname}/**.cpp",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}",
                "`/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config",
                "--cflags",
                "--libs`"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Zadanie wygenerowane przez debuger."
        }
    ],
    "version": "2.0.0"
}

[JonB]

@Kobid
If you want to figure out why the order of arguments matters, we could understand the command line better if we knew what the

`/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags --libs`

is returning, so we can compare the two actual, full command lines are, and hence how their behaviour differs.

I don't know how, but there is probably a way to get qmake or cmake alter what order arguments are passed. It's a bit tricky as obviously you have a single "token" returning some mixture of arguments.

Btw, do you need the --cflags argument to wx-config when you are producing the arguments for just the linker?

[Kobid]

Ahh, sorry, you are right, this is what it is returning:

-I/home/dibo/programowanie/wxWidgetsInstallGTK/lib/wx/include/gtk3-unicode-static-3.2 -I/home/dibo/programowanie/wxWidgetsInstallGTK/include/wx-3.2 -D_FILE_OFFSET_BITS=64 -D__WXGTK__ -pthread
-L/home/dibo/programowanie/wxWidgetsInstallGTK/lib -pthread   /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_gtk3u_xrc-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_gtk3u_qa-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_baseu_net-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_gtk3u_html-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_gtk3u_core-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_baseu_xml-3.2.a /home/dibo/programowanie/wxWidgetsInstallGTK/lib/libwx_baseu-3.2.a -lgthread-2.0 -pthread -lX11 -lXxf86vm -lSM -lxkbcommon -lgtk-3 -lgdk-3 -lpangocairo-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lXtst -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lharfbuzz -lfontconfig -lfreetype -lwxscintilla-3.2 -lexpat -lpcre2-32 -lpng -ljpeg -ltiff -ljbig -lz -lm

[JonB]

@Kobid
You have

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags --libs`")

Those are intended to be C++ flags (compiler) and would naturally come early on the command line. I think you want the linker library flags to go into qmake's LIBS or target_link_libraries() for cmake, as @Christian-Ehrlicher said earlier. That would be placed at the end of the linker command line. I know nothing about this, but maybe --cflags only should be used to construct CMAKE_CXX_FLAGS while --libs only should be used to construct LIBS/target_link_libraries()?

[Kobid]

I thought so that I'll probably need to add all libs in my .pro / cmakelists manually, there is a lot of them, --libs did all of the work in other IDEs. Well, no time to waste, it will be long evening :D

[Kobid]

But maybe there is some nasty workaround? For example in Visual Studio Code I also did a trick, I could not set this as one argument:

"args": [
                "-fdiagnostics-color=always",
                "-g",
                "${fileDirname}/**.cpp",
                //"${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}",
                "`/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags --libs`",
            ],

That is because if VS detect space in JSON argument, it pass to gcc as quoted argument. That is why I splitted it to:

"`/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config",
               "--cflags",
               "--libs`"

[JonB]

@Kobid said in How to build wxWidgetsets project using Qt Creator?:

I thought so that I'll probably need to add all libs in my .pro / cmakelists manually, there is a lot of them, --libs did all of the work in other IDEs. Well, no time to waste, it will be long evening :D

I don't understand. If you can run a command from cmake/qmake to what goes in CMAKE_CXX_FLAGS why can't you do so for LIBS or target_link_libraries() in the same way? Instead of you saying you have to paste in manually. Oh, you mean just doing that has to be across many makefiles? For all I know there might eb a global way. You could wait to see if someone else replies.

[Kobid]

Woooow!! I always thought that LIBS expect path to existing file etc. I didn't expect that it will accept shell command. I added this:

LIBS += `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --libs`

And everything is working! App is building and running. Amazing, I can use now my favourite IDE. Thank you guys!!
This is my finall .pro file. I must check if I can do same in CMake because I don't know yet which build system I will use:

TEMPLATE = app
CONFIG += c++17
CONFIG -= app_bundle
CONFIG -= qt

QMAKE_CXXFLAGS += `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags`

SOURCES += \
        SimpleBackupApp.cpp \
        SimpleBackupMain.cpp \
        ZipProcess.cpp

DISTFILES += \
    SimpleBackupWx.pro.user

HEADERS += \
    SimpleBackupApp.h \
    SimpleBackupMain.h \
    ZipProcess.h

INCLUDEPATH += /home/dibo/programowanie/wxWidgetsInstallGTK/include/wx-3.2
INCLUDEPATH += /home/dibo/programowanie/wxWidgetsInstallGTK/lib/wx/include/gtk3-unicode-static-3.2

LIBS += `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --libs`

But don't know why editor is still showing errors and don't recognize some wx classes and overloaded constructors. INCLUDEPATH is responsible for code completion or I must set paths to WX stricte in Qt Creator settings?

[JonB]

@Kobid
You can right-click on an orange-underlined function and select something like "Go to definition" or "declaration". See what is there and whether it's the path to the included file you expected.

[Kobid]

Ok. Finally solved everything. Checked compiler output and wx-config shell execution doesn't work in case of QMAKE_CXXFLAGS like it works in LIBS. So I changed this:

QMAKE_CXXFLAGS += `/home/dibo/programowanie/wxWidgetsInstallGTK/bin/wx-config --cflags`

To what this command exactly return:

QMAKE_CXXFLAGS += -I/home/dibo/programowanie/wxWidgetsInstallGTK/lib/wx/include/gtk3-unicode-static-3.2 -I/home/dibo/programowanie/wxWidgetsInstallGTK/include/wx-3.2 -D_FILE_OFFSET_BITS=64 -D__WXGTK__ -pthread

And now everything works perfectly, even code completion. Important -D__WXGTK__ was missed because gcc was called without what wx-config return