cppSettings.gradle

// This regex matches either a Windows or Unix style file separator, then the lib part of the library,
// then the name of the library itself, and finally the .so extension at the end. The name of the library
// is in the libName capture group, which is extracted and used for the linker flags
def libPattern = /.*((\\/|\\).*)+lib(?<libName>.+).so$/
def niLibraryArgs = []
def niLibraryPath = file('ni-libraries').path

// The NI Library tree includes all non-wpi libraries, which is everything that doesn't have libwpi in the name
def niLibraryTree = fileTree(niLibraryPath)
niLibraryTree.include '*.so'
niLibraryTree.exclude '*wpi*.so'

// This adds all linker flags to the list of ni library linker flags
niLibraryTree.each { lib ->
    def nameMatcher = (lib.path =~ libPattern)
    if (nameMatcher[0].size() > 1) {
        def name = nameMatcher.group('libName')
        niLibraryArgs << '-l' + name
    }
}

def ntDependency =
    project.dependencies.create("edu.wpi.first.wpilib.networktables.cpp:NetworkTables:3.0.0-SNAPSHOT:arm@zip")
def config = project.configurations.detachedConfiguration(ntDependency)
config.setTransitive(false)
def netTables = config.files[0].canonicalFile

def netTablesUnzipLocation = "$buildDir/networktables"

// Create a task that will unzip the networktables files into a temporary build directory
task unzipNetworkTables(type: Copy) {
    description = 'Unzips the networktables maven dependency so that the include files and libraries can be used'
    group = 'WPILib'
    from zipTree(netTables)
    into netTablesUnzipLocation
}

task clean(type: Delete) {
    description = "Deletes the build directory"
    group = "Build"
    delete buildDir
}

subprojects {
    plugins.withType(CppPlugin).whenPluginAdded {
        // This defines a project property that projects depending on network tables can use to setup that dependency.
        ext.defineNetworkTablesProperties = {
            ext.netTables = netTablesUnzipLocation
            ext.netTablesInclude = "$netTablesUnzipLocation/include"
            ext.netLibLocation = "$netTablesUnzipLocation/Linux/arm"
            ext.netSharedLib = "$netLibLocation/libntcore.so"
            ext.netStaticLib = "$netLibLocation/libntcore.a"

            task addNetworkTablesLibraryLinks() {
                description = 'Adds the linker flags for the networktables libraries retreived from maven'
                group = 'WPILib'
                dependsOn project(':').unzipNetworkTables
                doLast {
                    binaries.all {
                        tasks.withType(CppCompile) {
                            // desktop version doesn't use all the NI libraries
                            // so only do this for arm libraries
                            String architecture = targetPlatform.architecture
                            if (architecture.contains('arm')){
                                linker.args netStaticLib
                            }
                        }
                    }
                }
            }
        }

        model {
            buildTypes {
                debug
            }
            // Adds a custom toolchain for our compiler prefix and options
            toolChains {
                gcc(Gcc) {
                    target('arm') {
                        // We use a custom-built cross compiler with the prefix arm-frc-linux-gnueabi-<util name>
                        // If this ever changes, the prefix will need to be changed here
                        def compilerPrefix = 'arm-frc-linux-gnueabi-'
                        cppCompiler.executable = compilerPrefix + cppCompiler.executable
                        linker.executable = compilerPrefix + linker.executable
                        assembler.executable = compilerPrefix + assembler.executable
                        // Gradle auto-adds the -m32 argument to the linker and compiler. Our compiler only supports
                        // arm, and doesn't understand this flag, so it is removed from both
                        cppCompiler.withArguments { args ->
                            args << '-std=c++1y' << '-Wformat=2' << '-Wall' << '-Wextra' << '-Werror' << '-pedantic'
                            args << '-Wno-psabi' << '-Wno-unused-parameter' << '-fPIC' << '-O0' << '-g3' << '-rdynamic'
                            //TODO: When the compiler allows us to actually call deprecated functions from within
                            // deprecated function, remove this line (this will cause calling deprecated functions
                            // to be treated as a warning rather than an error).
                            args << '-Wno-error=deprecated-declarations'
                            args.remove('-m32')
                        }
                        linker.withArguments { args ->
                            args << '-rdynamic'
                            args.remove('-m32')
                        }
                        staticLibArchiver.executable = compilerPrefix + staticLibArchiver.executable
                    }
                }
                // Workaround for OS X. Macs for some reason want to use Xcode's gcc
                // (which just wraps Clang), so we have to explicitly make it so
                // that trying to compile with Clang will call gcc instead
                macGcc(Clang) {
                    target('arm') {
                        // We use a custom-built cross compiler with the prefix arm-frc-linux-gnueabi-<util name>
                        // If this ever changes, the prefix will need to be changed here
                        def compilerPrefix = 'arm-frc-linux-gnueabi-'
                        cppCompiler.executable = compilerPrefix + 'g++'
                        linker.executable = compilerPrefix + 'g++'
                        assembler.executable = compilerPrefix + 'gcc'
                        // Gradle auto-adds the -m32 argument to the linker and compiler. Our compiler only supports
                        // arm, and doesn't understand this flag, so it is removed from both
                        cppCompiler.withArguments { args ->
                            args << '-std=c++1y' << '-Wformat=2' << '-Wall' << '-Wextra' << '-Werror' << '-pedantic'
                            args << '-Wno-psabi' << '-Wno-unused-parameter' << '-fPIC' << '-O0' << '-g3' << '-rdynamic'
                            //TODO: When the compiler allows us to actually call deprecated functions from within
                            // deprecated function, remove this line (this will cause calling deprecated functions
                            // to be treated as a warning rather than an error).
                            args << '-Wno-error=deprecated-declarations'
                            args.remove('-m32')
                        }
                        linker.withArguments { args ->
                            args << '-rdynamic'
                            args.remove('-m32')
                        }
                        staticLibArchiver.executable = compilerPrefix + 'ar'
                    }
                }
            }

            // The only platform is arm linux
            platforms {
                arm {
                    architecture 'arm'
                    operatingSystem 'linux'
                }
            }
        }

        // This task adds the appropriate linker flags for the NI libraries
        task addNiLibraryLinks() {
            description = 'Adds the linker flags for the NI libraries in the ni-library folders'
            group = 'WPILib'
            doLast {
                binaries.all {
                    tasks.withType(CppCompile) {
                        // desktop version doesn't use all the NI libraries
                        // so only do this for arm libraries
                        String architecture = targetPlatform.architecture
                        if (architecture.contains('arm')){
                            linker.args << '-L' + niLibraryPath
                            linker.args.addAll(niLibraryArgs)
                        }
                    }
                }
                model {
                    repositories {
                        libs(PrebuiltLibraries) { libs ->
                            // Loops through all .so files (except files matching *libwpi*.so) in ../ni-libraries
                            // and includes them for linking
                            niLibraryTree.each { niLib ->
                                libs.create(niLib) {
                                    binaries.withType(SharedLibraryBinary) {
                                        sharedLibraryFile = file(niLib.path)
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}