Compile generate 0 byte files on OS X

[Amott]

Hello everybody,

I am working on a project that is a little bit hard for me because I don't have an extensive knowledge of Mac OS.

I have a project that works on Windows and I have to compile it on Mac OS, with Qt.

The problem is when I build the project, it generates me only empty files : .dylib .o .cpp and .h

am I missing something like a special command in the .pro file ?

Here is one .pro (others are nearly identical) :

#-------------------------------------------------
#
# Project created by QtCreator 2016-04-18T21:12:51
#
#-------------------------------------------------

QT       += widgets

TARGET = MdDimension
TEMPLATE = lib

DEFINES += MDDIMENSION_LIBRARY \
_TOOLKIT_IN_DLL_ \

INCLUDEPATH += ../MdCore \
        ../MdWidgets \
        ../include \
        ../include/teigha \
        ../include/Extensions/ExServices \
        ./GUI \

release {
DESTDIR = ../release
}

debug {
DESTDIR = ../debug
}

SOURCES += mddimensionmodule.cpp \
    widgets/mddimstylecombo.cpp \
    GUI/mddimstyletoolbar.cpp

HEADERS += mddimensionmodule.h\
    widgets/mddimstylecombo.h \
    GUI/mddimstyletoolbar.h \
    mddimensiondefs.h


win32{
    CONFIG(debug, debug|release) {
        LIBS += -L$$PWD/../build/debug -lMdCore \
                -L$$PWD/../build/debug -lMdWidgets \
                -L$$PWD/../build/debug -lMdModels \

        # Librairies ODA
        LIBS += -L$$PWD/../lib/win32/debug -lTD_Db \
         -L$$PWD/../lib/win32/debug -lTD_Root \
         -L$$PWD/../lib/win32/debug -lTD_Alloc \
         -L$$PWD/../lib/win32/debug -lTD_DbRoot \
        -ladvapi32

        DEPENDPATH += $$PWD/../lib/win32/debug
    }
    CONFIG(release, debug|release) {
        LIBS += -L$$PWD/../build/release -lMdCore \
                -L$$PWD/../build/release -lMdWidgets \
                -L$$PWD/../build/release -lMdModels \

        # Librairies ODA
        LIBS += -L$$PWD/../lib/win32/release -lTD_Db \
         -L$$PWD/../lib/win32/release -lTD_Root \
         -L$$PWD/../lib/win32/release -lTD_Alloc \
         -L$$PWD/../lib/win32/release/ -lTD_DbRoot \
        -ladvapi32

        DEPENDPATH += $$PWD/../lib/win32/release
    }
}


unix{
    CONFIG(debug, debug|release) {
        LIBS += -L$$PWD/../build/debug -lMdCore \
                -L$$PWD/../build/debug -lMdWidgets \
                -L$$PWD/../build/debug -lMdModels \

        # Librairies ODA
        LIBS += -L$$PWD/../lib/unix/debug -lTD_Db \
         -L$$PWD/../lib/unix/debug -lTD_Root \
         -L$$PWD/../lib/unix/debug -lTD_Alloc \
         -L$$PWD/../lib/unix/debug/ -lTD_DbRoot \

        DEPENDPATH += $$PWD/../lib/unix/debug
    }
    CONFIG(release, debug|release) {
        LIBS += -L$$PWD/../build/release -lMdCore \
                -L$$PWD/../build/release -lMdWidgets \
                -L$$PWD/../build/release -lMdModels \

        # Librairies ODA
        LIBS += -L$$PWD/../lib/unix/release -lTD_Db \
         -L$$PWD/../lib/unix/release -lTD_Root \
         -L$$PWD/../lib/unix/release -lTD_Alloc \
         -L$$PWD/../lib/unix/release -lTD_DbRoot \

        DEPENDPATH += $$PWD/../lib/unix/release
    }
}

unix {
    target.path = /usr/lib
    INSTALLS += target
}



TARGET_EXT = _4.02_14.mrx

RESOURCES += \
    mddimension.qrc

I don't have any error or warning when I build a library.

So if anyone have a clue or an explanation to the problem, I will be interested :)

Thank you !

[jsulm]

How do you build on MacOS? Which Qt version did you install and how?
Can you share the compiler/linker output?

[Amott]

hi jisulm, thanks for your response, to build on Mac OS I right click on my library and select "compile" or clean - qmake - compile when I change the .pro. I'm using Qt 5.7 on QtCreator 4.0.2.

Here is the output :

Reading makefiles...
Reading makefile `Makefile'...
Updating makefiles....
 Considering target file `Makefile'.
   Considering target file `../Myproject.pro'.
    Looking for an implicit rule for `../Myproject.pro'.
    Trying pattern rule with stem `Myproject.pro'.
    Trying implicit prerequisite `../Myproject.pro.o'.
    Trying pattern rule with stem `Myproject.pro'.
    Trying implicit prerequisite `../Myproject.pro.c'.
    Trying pattern rule with stem `Myproject.pro'.
    Trying implicit prerequisite `../Mediacad2.pro.cc'.
    Trying pattern rule with stem `Myproject.pro'.
    Trying implicit prerequisite `../Myproject.pro.C'.
    Trying pattern rule with stem `Myproject.pro'.
    Trying implicit prerequisite `../Myproject.pro.cpp'.
    Trying pattern rule with stem `Myproject.pro'.

... 

Looking for a rule with intermediate file `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.r'.
       Avoiding implicit rule recursion.
       Avoiding implicit rule recursion.
       Avoiding implicit rule recursion.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri'.
       Rejecting impossible implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.l'.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri.r'.
       Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.r,v'.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri.r'.
       Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/RCS/qt_lib_qmltest_private.pri.r,v'.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri.r'.
       Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/RCS/qt_lib_qmltest_private.pri.r'.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri.r'.
       Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/s.qt_lib_qmltest_private.pri.r'.
       Trying pattern rule with stem `qt_lib_qmltest_private.pri.r'.
       Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/SCCS/s.qt_lib_qmltest_private.pri.r'.
     Trying pattern rule with stem `qt_lib_qmltest_private.pri'.
     Rejecting impossible implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.F'.
     Trying pattern rule with stem `qt_lib_qmltest_private.pri'.
     Trying implicit prerequisite `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.m'.
     Looking for a rule with intermediate file `../../../../Qt/5.7/clang_64/mkspecs/modules/qt_lib_qmltest_private.pri.m'.
      Avoiding implicit rule recursion.
      Avoiding implicit rule recursion.
Skip doing additional output

And now I have 4 warnings :

/build/Makefile:1959: avertissement : overriding commands for target `install_target'
/build/Makefile:1944: avertissement : ignoring old commands for target build/Makefile:1959: avertissement : overriding commands for target `uninstall_target'
/build/Makefile:1944: avertissement : ignoring old commands for target `uninstall_target'

[SGaist]

Hi,

Unless I misunderstood, your lib project is part of a bigger project ? If so, what is it ?

One a side note, it seems you are having plenty of unneeded \ in your .pro file. You should clean them up

[Amott]

Hi SGaist,

yes, here it what the project looks like :
http://hpics.li/d8bb2ec
The main project uses every libs. And all of them generate empty files

[SGaist]

Can you show the content of medicad2.pro ?

[Amott]

here it is :

TEMPLATE = subdirs

SUBDIRS += \
    MdCore \
    MdWidgets \
    MediaCad \
    MdModels \
    QtOpenGL \
    MdDimension \
    MdProfile \
    MdDrawing2d \
    MdPrint \
    MddwgParameters

 # where to find the sub projects - give the folders
MdCore.subdir = MdCore
MdWidgets.subdir  = MdWidgets
MediaCad.subdir  = MediaCad
MdModels.subdir  = MdModels
MdDimension.subdir  = MdDimension
QtOpenGL.subdir  = QtOpenGL
MdProfile.subdir = MdProfile
MdDrawing2d.subdir = MdDrawing2d
MdPrint.subdir = MdPrint
MddwgParameters.subdir = MddwgParameters

 # what subproject depends on others
MdWidgets.depends = MdCore
MediaCad.depends = MdCore MdWidgets
MdModels.depends = MdCore
MdDimension.depends = MdCore MdWidgets
MdProfile.depends = MdCore MdWidgets MdModels
MdDrawing2d.depends = MdCore
MdPrint.depends = MdCore
MddwgParameters.depends = MdCore MdWidgets

[SGaist]

Can you reproduce that with a minimal project ?

Note there's one thing that I find a bit strange with your current project. For MdDimension, it looks like you are picking pieces from other folders and rebuild them there rather than having the common classes themselves in a library that would link against.

[Amott]

Yes, I have a basic project (just a main.cpp and a mainwindow), using the ODA library and I have the same result. Maybe the error comes from this library ?

[SGaist]

What does that library look like ?

[Amott]

I don't know what you mean by saying that but I hope my answer is what you expect.
ODA is a library to manage .dwg and .dgn files. It is composed with a folder "lib" where are placed a lot of .a, a folder "bin" with some unix executable, a folder "include" with some headers. I copied / pasted them into different folder and linked them to my application.
Here is the what the full library looks like :
http://hpics.li/58b8b54

[Amott]

Here I am again with some news, I have successfully built a basic project that includes ODA library, so I did the same operation with the same include files on the real project but it still generate me empty files.
I have compared both .pro file and I have notice that may be the source of the error :

target.path = /usr/lib
INSTALLS += target

It's the only thing that is different between the project that works and the real project. I have tried to change the target but nothing happens, am I missing something ?

[SGaist]

Try change target for some other name. my_target should do it.

[Amott]

I tried this too but it doesn't change anything. Maybe a last idea, at the very beginning, I had an error :
Undefined symbols for architecture x86_64
The solution I find was to add -stdlib=libstdc++ to qmake. Maybe there was another solution ?

[Amott]

I just realizze that I spoke too fast, my other project was working but it was to generate a .app not a lib...
I retried to create a lib step by step :
-create a lib project -> works
-add include path to ODA library to the project -> works
-use a variable of ODA -> error above
-add libstdc++ to qmake -> generate empty files
So the problem comes from either ODA or libstdc++, I will continue to search the solution

[SGaist]

Is ODA built against the old C++ library ?

[Amott]

I don't know, the package is named "Teigha_macOsX_x64_10.11" and the mac is in 64bit on OS X 10.11. I will ask in the ODA forum to know
Edit : I can generate some files now ! I change qmake argument to CFLAGS="-arch x86_64" but at a certain point it generate me the error above.

[SGaist]

The best would be to ensure what were the parameters used to build that library. It's surprising if they don't use libc++.

[Amott]

I have made a test with the command "file" to know what kind of library is it, here are my results :

a random lib in /usr/lib :

Mach-0 universal binary with 2 architectures
(for architecture x68_64): Mach-0 64-bit dynamically linked shared library x86_64
(for architecture i386): Mach-0 dynamically linked shared library i386

a lib from ODA :

current ar archive random library

I'm not sure of what it means, the library is not compatible with the Mac ?

[kenchan]

@Amott

I use that ODA library on OSX and I link it with the c library like this...

LIBS += -lc++ \
-lTD_Db \
... other ODA libs

and it works fine.