CODEWITHSUNDEEP
c++macosqt
robert
robert

Reputation: 3726

Mac OSX, Qt Creator and Google Test

I installed Google Test according to this How to properly setup googleTest on OS X aside from XCode. So, lib files ended up in /usr/lib/. But I was unable to compile with command

clang++ -I/usr/include -L/usr/lib t.cpp -lgtest

since I have received

ld: library not found for -lgtest

I have found this post ld library path not working under OS X 10.9, so I copied the libraries to another location: /opt/local/lib. Now I am able to compile my code using

clang++ -I/opt/local/include -L/opt/local/lib/ t.cpp -lgtest

However, I can not remove them from /usr/lib. If I do, I can not run the compiled program:

dyld: Library not loaded: /usr/local/lib/libgtest.0.dylib
Referenced from: /path_to_code/./a.out
Reason: image not found
Trace/BPT trap: 5

Maybe this is only some setting in my OS?

After being able to compile from command line, I tried from Qt Creator. I added to the project file

INCLUDEPATH += /opt/local/include
LIBS += -L/opt/local/lib -L/usr/lib -lgtest

but I have unresolved symbols:

   Undefined symbols for architecture x86_64:
   "testing::internal::EqFailure(char const*, char const*, std::string const&, std::string const&, bool)", referenced from:
   testing::AssertionResult testing::internal::CmpHelperEQ<int, int>(char const*, char const*, int const&, int const&) in main.o
   "std::string::c_str() const", referenced from:
   testing::AssertionResult::message() const in main.o
   "std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::str() const", referenced from:
   std::string testing::PrintToString<int>(int const&) in main.o
   "std::ostream::operator<<(int)", referenced from:
   void testing_internal::DefaultPrintNonContainerTo<int>(int const&, std::ostream*) in main.o
   "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:
   testing::AssertionResult testing::internal::CmpHelperEQ<int, int>(char const*, char const*, int const&, int const&) in main.o
   testing::internal::scoped_ptr<std::string>::reset(std::string*) in main.o
   "std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::_Ios_Openmode)", referenced from:
   std::string testing::PrintToString<int>(int const&) in main.o
   "std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_stringstream()", referenced from:
   std::string testing::PrintToString<int>(int const&) in main.o
   "std::ios_base::Init::Init()", referenced from:
   ___cxx_global_var_init in main.o
   "std::ios_base::Init::~Init()", referenced from:
   ___cxx_global_var_init in main.o
       ld: symbol(s) not found for architecture x86_64
   clang: error: linker command failed with exit code 1 (use -v to see invocation)
       make: *** [ut1] Error 1
       22:52:06: The process "/usr/bin/make" exited with code 2.
   Error while building/deploying project ut1 (kit: Desktop Qt 5.3 clang 64bit)
       When executing step "Make"

Can somebody explain me what is happening there?

Upvotes: 0

Views: 875

Answers (2)

Sez
Sez

Reputation: 1293

To get Qt Creator in Qt 5.x to generate a Makefile that will work with STL you need to add to your pro file:

CONFIG += stl

Also if you are using C++11 features you need

CONFIG += stl c++11

I notice there seems to be some sort of bug in mkspecs/features/c++14.prf as the result of 

CONFIG += stl c++14

...is that the switch

-stdlib=libc++

is missing from the compiler command line during the source file compile step, which means that turning on C++14 support in Qt will defeat the STL switch, and you get link time errors, as far as I can tell. To fix this you can do:

CONFIG += stl c++14
QMAKE_CXXFLAGS += -stdlib=libc++

Which worked for me.

Upvotes: 0

vsoftco
vsoftco

Reputation: 56577

You need to set the environment variable DYLD_LIBRARY_PATH to the location of the library, so type in the terminal

export DYLD_LIBRARY_PATH=/path/to/your/library

(note: this works only for the current session, put it in your .profile if you need to work permanently)

I find this extremely annoying, but that's how OS X deals with shared libraries.

As for you second linking error, probably the same issue, you need to specify the environment variable in the Qt Creator (I don't have it installed, but there should be an option somewhere in the project configuration).

Upvotes: 1

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