Implement Homebrew toolchain provider for core build

Author: jld01

build/org.eclipse.cdt.build.gcc.core/META-INF/MANIFEST.MF

@@ -7,7 +7,7 @@ Bundle-Activator: org.eclipse.cdt.build.gcc.core.internal.Activator
 Bundle-Vendor: %providerName
 Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.33.0,4)",
  org.eclipse.core.resources;bundle-version="[3.22.200,4)",
- org.eclipse.cdt.core;bundle-version="[9.1.0,10)",
+ org.eclipse.cdt.core;bundle-version="[9.2.0,10)",
  com.google.gson;bundle-version="[2.13.1,3)"
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Bundle-ActivationPolicy: lazy

build/org.eclipse.cdt.build.gcc.core/plugin.xml

@@ -7,6 +7,10 @@
             class="org.eclipse.cdt.build.gcc.core.internal.GCCPathToolChainProvider"
             id="org.eclipse.cdt.build.gcc.core.gccPathProvider">
       </provider>
+      <provider
+            class="org.eclipse.cdt.build.gcc.core.internal.HomebrewToolChainProvider"
+            id="org.eclipse.cdt.build.gcc.core.homebrewProvider">
+      </provider>
       <provider
             class="org.eclipse.cdt.build.gcc.core.internal.Msys2ToolChainProvider"
             id="org.eclipse.cdt.build.gcc.core.msys2Provider">

build/org.eclipse.cdt.build.gcc.core/src/org/eclipse/cdt/build/gcc/core/internal/HomebrewToolChainProvider.java

@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2016, 2025 QNX Software Systems and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ * Contributors:
+ *     QNX Software Systems - MinGW implementation
+ *     John Dallaway - Initial Homebrew implementation (#1175)
+ *******************************************************************************/
+package org.eclipse.cdt.build.gcc.core.internal;
+
+import java.io.File;
+import java.nio.file.Path;
+import java.util.regex.Pattern;
+
+import org.eclipse.cdt.build.gcc.core.ClangToolChain;
+import org.eclipse.cdt.build.gcc.core.GCCToolChain;
+import org.eclipse.cdt.core.build.IToolChain;
+import org.eclipse.cdt.core.build.IToolChainManager;
+import org.eclipse.cdt.core.build.IToolChainProvider;
+import org.eclipse.cdt.core.envvar.EnvironmentVariable;
+import org.eclipse.cdt.core.envvar.IEnvironmentVariable;
+import org.eclipse.cdt.internal.core.Homebrew;
+import org.eclipse.core.runtime.Platform;
+
+public class HomebrewToolChainProvider implements IToolChainProvider {
+
+	private static final String ID = "org.eclipse.cdt.build.gcc.core.homebrewProvider"; //$NON-NLS-1$
+	private static final Pattern CLANG_PATTERN = Pattern.compile("clang-\\d+"); //$NON-NLS-1$
+	private static final Pattern GCC_PATTERN = Pattern.compile("gcc-\\d+"); //$NON-NLS-1$
+	private static final String ENV_PATH = "PATH"; //$NON-NLS-1$
+	private static final String HOMEBREW_PACKAGE = "homebrew"; //$NON-NLS-1$
+
+	@Override
+	public String getId() {
+		return ID;
+	}
+
+	@Override
+	public void init(IToolChainManager manager) {
+		final String homebrewHome = Homebrew.getHomebrewHome();
+		if (null != homebrewHome) {
+			Path homebrewPath = new File(homebrewHome).toPath();
+			Path homebrewBinPath = homebrewPath.resolve("bin"); //$NON-NLS-1$
+			Path homebrewLlvmBinPath = homebrewPath.resolve("opt/llvm/bin"); //$NON-NLS-1$
+			for (File clangFile : getFiles(homebrewLlvmBinPath, CLANG_PATTERN)) {
+				IEnvironmentVariable[] vars = createEnvironmentVariables(homebrewLlvmBinPath);
+				IToolChain toolChain = new ClangToolChain(this, clangFile.toPath(), Platform.getOSArch(), vars);
+				toolChain.setProperty(IToolChain.ATTR_PACKAGE, HOMEBREW_PACKAGE);
+				manager.addToolChain(toolChain);
+			}
+			for (File gccFile : getFiles(homebrewBinPath, GCC_PATTERN)) {
+				IEnvironmentVariable[] vars = createEnvironmentVariables(homebrewBinPath);
+				IToolChain toolChain = new GCCToolChain(this, gccFile.toPath(), Platform.getOSArch(), vars);
+				toolChain.setProperty(IToolChain.ATTR_PACKAGE, HOMEBREW_PACKAGE);
+				manager.addToolChain(toolChain);
+			}
+		}
+	}
+
+	private File[] getFiles(Path path, Pattern filePattern) {
+		File dir = path.toFile();
+		if (dir.isDirectory()) {
+			return dir.listFiles(file -> file.isFile() && filePattern.matcher(file.getName()).matches());
+		}
+		return new File[0];
+	}
+
+	private IEnvironmentVariable[] createEnvironmentVariables(Path path) {
+		EnvironmentVariable pathVariable = new EnvironmentVariable(ENV_PATH, path.toString(),
+				IEnvironmentVariable.ENVVAR_PREPEND, File.pathSeparator);
+		return new IEnvironmentVariable[] { pathVariable };
+	}
+
+}