Add GNU linker library grouping option to MBS

build/org.eclipse.cdt.managedbuilder.gnu.ui/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.cdt.managedbuilder.gnu.ui; singleton:=true
-Bundle-Version: 8.5.300.qualifier
+Bundle-Version: 8.6.0.qualifier
 Bundle-Activator: org.eclipse.cdt.managedbuilder.gnu.ui.GnuUIPlugin
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin

build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.properties

@@ -1,5 +1,5 @@
 ###############################################################################
-# Copyright (c) 2005, 2010 Texas Instruments Inc. and others.
+# Copyright (c) 2005, 2023 Texas Instruments Inc. and others.
 #
 # This program and the accompanying materials
 # are made available under the terms of the Eclipse Public License 2.0
@@ -11,6 +11,7 @@
 # Contributors:
 #     Texas Instruments Inc. - initial API and implementation
 #     IBM Corporation
+#     John Dallaway - add library grouping option (#608)
 ###############################################################################
 
 # plugin names
@@ -208,6 +209,7 @@ Option.Posix.Linker.Strip.debug=Omit debug symbol information (-S)
 Option.Posix.Linker.Static=No shared libraries (-static)
 Option.Posix.Linker.XLinker=Other options (-Xlinker [option])
 Option.Posix.Linker.Flags=Linker flags
+Option.Posix.Linker.GroupLibs=Group libraries (-Wl,--start-group  ...  -Wl,--end-group)
 Option.Posix.Libs=Libraries (-l)
 Option.Posix.Libsearch=Library search path (-L)
 Option.Posix.UserObjs=Other objects

build/org.eclipse.cdt.managedbuilder.gnu.ui/plugin.xml

@@ -83,6 +83,7 @@
                name="%Option.Posix.Libs"
                category="gnu.c.link.category.libs"
                command="-l"
+               commandGenerator="org.eclipse.cdt.managedbuilder.gnu.ui.LibrariesCommandGenerator"
                id="gnu.c.link.option.libs"
                browseType="none"
                valueType="libs">
@@ -95,6 +96,13 @@
                browseType="directory"
                valueType="libPaths">
          </option>
+         <option
+               defaultValue="false"
+               name="%Option.Posix.Linker.GroupLibs"
+               category="gnu.c.link.category.libs"
+               id="gnu.c.link.option.group"
+               valueType="boolean">
+         </option>
          <optionCategory
                owner="cdt.managedbuild.tool.gnu.c.linker"
                name="%OptionCategory.Misc"

build/org.eclipse.cdt.managedbuilder.gnu.ui/src/org/eclipse/cdt/managedbuilder/gnu/ui/LibrariesCommandGenerator.java

@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * Copyright (c) 2023 John Dallaway 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:
+ *    John Dallaway - initial implementation (#608)
+ *******************************************************************************/
+package org.eclipse.cdt.managedbuilder.gnu.ui;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
+import org.eclipse.cdt.core.cdtvariables.CdtVariableException;
+import org.eclipse.cdt.managedbuilder.core.BuildException;
+import org.eclipse.cdt.managedbuilder.core.IOption;
+import org.eclipse.cdt.managedbuilder.core.IOptionCommandGenerator;
+import org.eclipse.cdt.utils.cdtvariables.CdtVariableResolver;
+import org.eclipse.cdt.utils.cdtvariables.IVariableSubstitutor;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.Status;
+
+/**
+ * An option command generator to group libraries on the GNU linker command line
+ * @noextend This class is not intended to be subclassed by clients.
+ * @noinstantiate This class is not intended to be instantiated by clients.
+ * @since 8.6
+ */
+public class LibrariesCommandGenerator implements IOptionCommandGenerator {
+
+	private static final String GROUP_LIBRARIES_COMMAND_FORMAT = "-Wl,--start-group %s -Wl,--end-group"; //$NON-NLS-1$
+	private static final String GROUP_LIBRARIES_OPTION_ID = "gnu.c.link.option.group"; //$NON-NLS-1$
+
+	@Override
+	public String generateCommand(IOption option, IVariableSubstitutor macroSubstitutor) {
+		IOption groupOption = option.getOptionHolder().getOptionBySuperClassId(GROUP_LIBRARIES_OPTION_ID);
+		try {
+			if ((groupOption != null) && groupOption.getBooleanValue()) { // if library grouping enabled
+				String command = option.getCommand();
+				String libraries = Arrays.stream(option.getLibraries()).map(lib -> command + lib)
+						.collect(Collectors.joining(" ")); //$NON-NLS-1$
+				if (!libraries.isEmpty()) {
+					libraries = CdtVariableResolver.resolveToString(libraries, macroSubstitutor);
+					return String.format(GROUP_LIBRARIES_COMMAND_FORMAT, libraries);
+				}
+			}
+		} catch (BuildException | CdtVariableException e) {
+			Platform.getLog(getClass()).log(Status.error("Error generating libraries command", e)); //$NON-NLS-1$
+		}
+		return null; // fallback to default command generator
+	}
+
+}