Compile generate 0 byte files on OS X

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.

Amott

@kenchan

Thanks for your response ! I have tried again but I still have the same error. Which version of OSX, ODA and XCode are you using ?