gradle-master/subprojects/platform-native/src/main/java/org/gradle/nativeplatform/toolchain/internal/gcc/GccCompilerArgsTransformer.java
/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.nativeplatform.toolchain.internal.gcc;

import com.google.common.collect.Lists;
import org.gradle.nativeplatform.platform.NativePlatform;
import org.gradle.nativeplatform.toolchain.internal.ArgsTransformer;
import org.gradle.nativeplatform.toolchain.internal.MacroArgsConverter;
import org.gradle.nativeplatform.toolchain.internal.NativeCompileSpec;

import java.io.File;
import java.util.Collections;
import java.util.List;

/**
 * Maps common options for C/C++ compiling with GCC
 */
abstract class GccCompilerArgsTransformer<T extends NativeCompileSpec> implements ArgsTransformer<T> {
    @Override
    public List<String> transform(T spec) {
        List<String> args = Lists.newArrayList();
        addToolSpecificArgs(spec, args);
        addMacroArgs(spec, args);
        addUserArgs(spec, args);
        addIncludeArgs(spec, args);
        return args;
    }

    protected void addToolSpecificArgs(T spec, List<String> args) {
        Collections.addAll(args, "-x", getLanguage());
        args.add("-c");
        if (spec.isPositionIndependentCode()) {
            if (!spec.getTargetPlatform().getOperatingSystem().isWindows()) {
                args.add("-fPIC");
            }
        }
        if (spec.isDebuggable()) {
            args.add("-g");
        }
        if (spec.isOptimized()) {
            args.add("-O3");
        }
    }

    protected void addIncludeArgs(T spec, List<String> args) {
        if (!needsStandardIncludes(spec.getTargetPlatform())) {
            args.add("-nostdinc");
        }

        for (File file : spec.getIncludeRoots()) {
            args.add("-I");
            args.add(file.getAbsolutePath());
        }

        for (File file : spec.getSystemIncludeRoots()) {
            args.add("-isystem");
            args.add(file.getAbsolutePath());
        }
    }

    protected void addMacroArgs(T spec, List<String> args) {
        for (String macroArg : new MacroArgsConverter().transform(spec.getMacros())) {
            args.add("-D" + macroArg);
        }
    }

    protected void addUserArgs(T spec, List<String> args) {
        args.addAll(spec.getAllArgs());
    }

    protected boolean needsStandardIncludes(NativePlatform targetPlatform) {
        return targetPlatform.getOperatingSystem().isMacOsX();
    }

    protected abstract String getLanguage();

}
