Boost + Qt installation problem (cannot find -lboost_system)
Ok currently having a problem using boost with Qt.
Boost was built as complete, so contains all the files needed to work (.a,dll.a,dll)
As you can see it contains lots of liboost system libraries. All with the correct build version (built using QT creators mingw version - 491_32.
Inside my .pro file i've included the locations of the boost folder along with the library location.
QT += core QT -= gui widget TARGET = Testing_Exif CONFIG += console CONFIG -= app_bundle INCLUDEPATH += C:\releases\lib\boost\Qt\boost_1_58_0 LIBS += -LC:\releases\lib\boost\Qt\boost_1_58_0\stage\lib\ \ -lboost_system -lboost_thread TEMPLATE = app SOURCES += main.cpp \ EXIF.cpp HEADERS += EXIF.h
Compiler Output listed below:
C:/Qt/Qt5.4.1/Tools/mingw491_32/bin/../lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lboost_system collect2.exe: error: ld returned 1 exit status Makefile.Debug:80: recipe for target 'debug\Testing_Exif.exe' failed mingw32-make: *** [debug\Testing_Exif.exe] Error 1
As you can imagine not really sure where to go from here, as have to use boost no matter what.
For a test example I have created a single very basic file that just contains:
QCoreApplication a(argc, argv); const boost::filesystem::path inputFileName = "C:\\Users\\Nick.CSM3D\\Documents\\Qt\\Testing_Exif\\ROOS_JUDY_RT.jpeg"; return a.exec();
Anyone has a clue why I am not able to add -lboost_system (whether that be using its direct name, well one of them, or the name listed to the left). If anyone has an idea where I am going wrong that would be great.
If anyone has an idea where I should go from here that would be great
The problem is that
LIBS += -lboost_systemtries to link a library named
In your case you have the platform naming
mgw49that differs from what the linker expect.
You can either:
- rebuild boost without platform information (IIRC there's a flag to do this but I don't remember exactly the name)
- add the platform information to the
LIBS += =lboost_system-mgw49-mt-1_58
UPDATE: The flag to control the library naming should be
--layout. To remove compilers, tools in the library name you should use
Ah thanks for the help mcosta that was it, didn't realise that i still had to use "-lboost" instead of "-libboost". Is there any reason why they aren't the same as the filename itself ?
Also cheers for layout stuff should make my life easier for later.
library naming is something OS related (for instance the filename for a dynamic library called
fooon Windows with Visual Studio will be
foo.dll, on Linux
libfoo.so, on OS X
For this reason when you pass the library name to the linker you have to omit the prefix (ususally lib) and the extension.
NOTE in case of MinGW you'll have the naming conventions used in Linux/Unix (