ADDED   .github/workflows/CXXTest.mm
Index: .github/workflows/CXXTest.mm
==================================================================
--- /dev/null
+++ .github/workflows/CXXTest.mm
@@ -0,0 +1,31 @@
+#import <ObjFW/ObjFW.h>
+
+#include <string>
+
+@interface CXXTest: OFObject <OFApplicationDelegate>
+@end
+
+OF_APPLICATION_DELEGATE(CXXTest)
+
+@implementation CXXTest
+- (void)applicationDidFinishLaunching: (OFNotification *)notification
+{
+	std::string output;
+
+	try {
+		@try {
+			throw @"Hello ";
+		} @catch (OFString *string) {
+			output += string.UTF8String;
+		}
+
+		throw std::string("C++");
+	} catch (std::string &string) {
+		output += "C++";
+	}
+
+	OFLog(@"%s", output.c_str());
+
+	[OFApplication terminate];
+}
+@end

Index: .github/workflows/macos-14.yml
==================================================================
--- .github/workflows/macos-14.yml
+++ .github/workflows/macos-14.yml
@@ -27,5 +27,9 @@
       run: make -j$(sysctl -n hw.logicalcpu)
     - name: make check
       run: make check
     - name: make install
       run: sudo make install
+    - name: C++ test
+      run: |
+        objfw-compile -o cxxtest .github/workflows/CXXTest.mm
+        ./cxxtest

Index: .github/workflows/ubuntu-latest.yml
==================================================================
--- .github/workflows/ubuntu-latest.yml
+++ .github/workflows/ubuntu-latest.yml
@@ -37,5 +37,9 @@
       run: make -j$(nproc)
     - name: make check
       run: make check
     - name: make install
       run: sudo make install
+    - name: C++ test
+      run: |
+        objfw-compile -o cxxtest .github/workflows/CXXTest.mm
+        ./cxxtest