'Additional include paths and linker options Gradle for C++

I was trying to use Gradle to compile a C++ project, but I can't find the way of declaring what additional include paths I want at compile time, and what additional libraries at link time. I've seen solutions involving model { } inside project (I don't remember exactly). (But didn't work, Gradle complains all the time about non existing function.)

Also does not seem to be a clear or simple way to add Conan dependencies to a Gradle project yet. That leaves me compiling libraries on my own and then adding to the build system, but again, I can't find the way.

I've been looking in the docs for the answer, but all I find is about adding maven dependencies (But GLFW, GLEW and DearIMGUI aren't on Maven I guess...).

Any quirk? How Can I possibly just register additional includes/link files?

My build.gradle.kts:

plugins {
    id("cpp-application")
}

tasks.register("runDebug") {
    doLast {
        exec {
            executable = "./build/exe/main/debug/my-app.exe"
        }
    }
}
c++gradlebuild-systemconan


Solution 1:[1]

After 5 hours of searching, I finally found a solution to build QT application with Gradle. Thanks to @s-kadakov.

plugins {
    id 'cpp-application'
    id 'cpp-unit-test'
}

application {
    targetMachines.add(machines.linux.x86_64)
}

tasks.withType(CppCompile).configureEach {
    compilerArgs.add '-fPIC'
    includes {
        '/usr/include/qt'
    }

    compilerArgs.addAll toolChain.map { toolChain ->
        if (toolChain in [ Gcc, Clang ]) {
            return ['-O2', '-fno-access-control']
        } else if (toolChain in VisualCpp) {
            return ['/Zi']
        }
        return []
    }
}

tasks.withType(LinkExecutable).configureEach {
    linkerArgs.add '-v'

    linkerArgs.add '-lQt5Core'
    linkerArgs.add '-lQt5Widgets'
    linkerArgs.add '-lQt5Gui'

}

I hope this helps for you.

Solution 2:[2]

Using Gradle 6.7 you may do something like that:

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This generated file contains a sample C++ project to get you started.
 * For more details take a look at the Building C++ applications and libraries chapter in the Gradle
 * User Manual available at https://docs.gradle.org/6.7/userguide/building_cpp_projects.html
 */

plugins {
    // Apply the cpp-application plugin to add support for building C++ executables
    id 'cpp-application'
}

// Set the target operating system and architecture for this application
application {
    targetMachines.add(machines.linux.x86_64)
    
    // You may add extra private headrs 
    //privateHeaders {
    //  from('src/headers')
    //}    
}

// Some compiler configuration
tasks.withType(CppCompile).configureEach {
    // Define a preprocessor macro for every binary
    macros.put("NDEBUG", null)

    // Define a compiler options
    compilerArgs.add '-W3'

    // You may add extra include path 
    // as of -I<path> option 
    //compilerArgs.add '-I/usr/local/include/foo'
    
    // ... or even as list of extra paths
    includes {
        '/usr/local/include/foo'
    }

    // Define toolchain-specific compiler options
    compilerArgs.addAll toolChain.map { toolChain ->
        if (toolChain in [ Gcc, Clang ]) {
            return ['-O2', '-fno-access-control']
        } else if (toolChain in VisualCpp) {
            return ['/Zi']
        }
        return []
    }
}

// Linker configuration
tasks.withType(LinkExecutable).configureEach {
    // Add verbose output to linker
    // usefull while errors
    linkerArgs.add '-v' 
  
    // Add additional libraries as simple as
    linkerArgs.add '-lm' 
    linkerArgs.add '-lfoo' 

}

Solution 3:[3]

To add header directories or add compiler options; after the plugins section add an application section like this:

application {
  privateHeaders {
   from('src/headers')
   from('/usr/include/qt5')
   }
   // To add compiler args do the following below
   binaries.configureEach {
      compileTask.get().compilerArgs.add('-O2')
   }
}

I am still trying to figure how to add the libraries or linker args :(

Solution 4:[4]

Using Gradle 7.4.1, this worked for my cpp-library:

apply plugin: 'cpp-library'

...

library {

    ...

    binaries.configureEach {
        ...
        linkTask.get().linkerArgs.add("<argument here>")
        ...
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Rejedai
Solution 2 S. Kadakov
Solution 3 Don Wagner
Solution 4 el_chupacabra

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