OSX clang link error

RodrigoCanellas

Hi!

I have a very simple project, just to test lists network interfaces, which .pro file is:

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

SOURCES += \
        main.cpp

The main.cpp file is:

#include <CoreFoundation/CFString.h>
#include <SystemConfiguration/SCNetworkConfiguration.h>
#include <iostream>

int main() {
    int				count = 0;
    CFArrayRef			list;

    list = SCNetworkInterfaceCopyAll();
    if (list != NULL) {
        count = CFArrayGetCount(list);
    }
    if (count == 0) {
        return 1;
    }
    for (int i = 0; i < count; i++) {
        SCNetworkInterfaceRef	this_if;
        CFStringRef		this_if_name;

        this_if = (SCNetworkInterfaceRef)CFArrayGetValueAtIndex(list, i);
        this_if_name = SCNetworkInterfaceGetBSDName(this_if);
        if (this_if_name == NULL) {
            continue;
        }
        {
            const CFIndex kCStringSize = 512;
            char str[kCStringSize];
            bzero(str,kCStringSize);
            CFStringGetCString(this_if_name, str, kCStringSize, kCFStringEncodingUTF8);
            std::cout << str << std::endl;
        }
    }
    return 0;
}

The compiler output:


12:08:47: Running steps for project list_network_interfaces...
12:08:47: Starting: "/usr/bin/make" clean -j4
/Users/rodrigo.canellas/Documents/Qt/5.15.1/clang_64/bin/qmake -o Makefile ../list_network_interfaces/list_network_interfaces.pro -spec macx-clang CONFIG+=debug CONFIG+=x86_64 CONFIG+=qml_debug
rm -f main.o
rm -f *~ core *.core
12:08:48: The process "/usr/bin/make" exited normally.
12:08:48: Starting: "/Users/rodrigo.canellas/Documents/Qt/5.15.1/clang_64/bin/qmake" /Users/rodrigo.canellas/studies/list_network_interfaces/list_network_interfaces.pro -spec macx-clang CONFIG+=debug CONFIG+=x86_64 CONFIG+=qml_debug
12:08:48: The process "/Users/rodrigo.canellas/Documents/Qt/5.15.1/clang_64/bin/qmake" exited normally.
12:08:48: Starting: "/usr/bin/make" -f /Users/rodrigo.canellas/studies/build-list_network_interfaces-Desktop_Qt_5_15_1_clang_64bit-Debug/Makefile qmake_all
make: Nothing to be done for `qmake_all'.
12:08:48: The process "/usr/bin/make" exited normally.
12:08:48: Starting: "/usr/bin/make" -j4
/Library/Developer/CommandLineTools/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++1z  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=10.13 -Wall -Wextra -fPIC -DQT_QML_DEBUG -I../list_network_interfaces -I. -I../../Documents/Qt/5.15.1/clang_64/mkspecs/macx-clang -o main.o ../list_network_interfaces/main.cpp
/Library/Developer/CommandLineTools/usr/bin/clang++ -stdlib=libc++ -headerpad_max_install_names  -arch x86_64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -mmacosx-version-min=10.13 -Wl,-rpath,@executable_path/../Frameworks -o list_network_interfaces main.o      
Undefined symbols for architecture x86_64:
  "_CFArrayGetCount", referenced from:
      _main in main.o
  "_CFArrayGetValueAtIndex", referenced from:
      _main in main.o
  "_CFStringGetCString", referenced from:
      _main in main.o
  "_SCNetworkInterfaceCopyAll", referenced from:
      _main in main.o
  "_SCNetworkInterfaceGetBSDName", referenced from:
      _main 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: *** [list_network_interfaces] Error 1
12:08:50: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project list_network_interfaces (kit: Desktop Qt 5.15.1 clang 64bit)
When executing step "Make"
12:08:50: Elapsed time: 00:03.

I tried to include QMAKE_CXXFLAGS += -framework Foundation and LIBS += -lc++ in the .pro file, as I read in another forum, but with no results.

Does anyone know which libraries should I link?

Thanks!

RodrigoCanellas

The solution I found was to add LIBS += -framework Foundation -framework SystemConfiguration to the .pro

SGaist

Hi and welcome to devnet,

Usually the include path of macOS headers is a good tip to what framework the header belongs to.