CMake and GTK+ 3

CMakeLists.txt

# Thanks to @danger89 and @Ilothar for updating the gist.
# Set the name and the supported language of the project
project(hello-world C CXX)

# Set the minimum version of cmake required to build this project
cmake_minimum_required(VERSION 3.10)

# Use the package PkgConfig to detect GTK+ headers/library files
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK REQUIRED gtkmm-3.0)


add_executable(hello main.cpp)
target_link_libraries(hello PRIVATE ${GTKMM_LIBRARIES})


# Add other flags to the compiler
target_compile_definitions(hello PRIVATE ${GTKMM_CFLAGS_OTHER})


# Setup CMake to use GTK+, tell the compiler where to look for headers
# and to the linker where to look for libraries
target_include_directories(hello PRIVATE ${GTKMM_INCLUDE_DIRS})
target_link_directories(hello PRIVATE ${GTKMM_LIBRARY_DIRS})

hello.c

#include <gtk/gtk.h>

static void
activate(GtkApplication *app,
    gpointer user_data) {
    GtkWidget *window;

    window = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(window), "Hello GNOME");
    gtk_widget_show_all(window);
}

int
main(int argc, char **argv) {
    GtkApplication *app;
    int status;

    app = gtk_application_new("org.gtk.example",
        G_APPLICATION_FLAGS_NONE);
    g_signal_connect(app, "activate",
        G_CALLBACK(activate), NULL);
    status = g_application_run(G_APPLICATION(app), argc, argv);
    g_object_unref(app);
    return (status);
}

See also:

• For C++: https://github.com/danger89/cpp-gtk-test-app
• For C: https://github.com/danger89/c-gtk-test-app

https://github.com/shlomif/gtk3-cmake-examples/blob/master/CMakeLists.txt

Again, as said earlier in this thread, please use:

target_include_directories(${PROJECT_TARGET} PRIVATE ${GTK_INCLUDE_DIRS})
target_link_directories(${PROJECT_TARGET} PRIVATE ${GTK_LIBRARY_DIRS})
target_compile_options(${PROJECT_TARGET} PRIVATE ${GTK_CFLAGS_OTHER})

instead (so with target_ prefix).

So DO NOT USE the following anymore:

include_directories(${GTK3_INCLUDE_DIRS})
link_directories(${GTK3_LIBRARY_DIRS})
add_definitions(${GTK3_CFLAGS_OTHER})

The code:

target_compile_definitions(hello PRIVATE ${GTKMM_CFLAGS_OTHER})

are breaking my compilation. Because it insert the flag -D-pthread, this generate the error:

error: macro names must be identifiers

Like I said earlier in this thread. Should use target_compile_options(hello PRIVATE ${GTKMM_CFLAGS_OTHER}) instead.

@raulpy271 I said this litterly above your comment https://gist.github.com/fracek/3323924?permalink_comment_id=4023933#gistcomment-4023933

I'm having a problem with these three lines, it says called with incorrect number of arguments:

target_include_directories(${PROJECT_TARGET} PRIVATE ${GTK_INCLUDE_DIRS})
target_link_directories(${PROJECT_TARGET} PRIVATE ${GTK_LIBRARY_DIRS})
target_compile_options(${PROJECT_TARGET}  ${GTK_CFLAGS_OTHER})

Did you set PROJECT_TARGET variable as your target name for your project? I mean this variable should be set by you.

@fracek Please, fix your mistakes.

Can you change: pkg_check_modules(GTK REQUIRED gtkmm-3.0) to: pkg_check_modules(GTKMM REQUIRED gtkmm-3.0) in your snippet. Line 10.

And change target_compile_definitions(hello PRIVATE ${GTKMM_CFLAGS_OTHER}) to target_compile_options(hello PRIVATE ${GTKMM_CFLAGS_OTHER}). On line 18.

@revix-0 I think you should target_compile_options(${PROJECT_TARGET} ${GTK_CFLAGS_OTHER}) change to target_compile_options(${PROJECT_TARGET} PRIVATE ${GTK_CFLAGS_OTHER})