diff --git a/source/dub/compilers/gdc.d b/source/dub/compilers/gdc.d
index db392e7..71625f8 100644
--- a/source/dub/compilers/gdc.d
+++ b/source/dub/compilers/gdc.d
@@ -52,14 +52,41 @@
 
 	BuildPlatform determinePlatform(ref BuildSettings settings, string compiler_binary, string arch_override)
 	{
-		// TODO: determine platform by invoking the compiler instead
-		BuildPlatform build_platform;
-		build_platform.platform = .determinePlatform();
-		build_platform.architecture = .determineArchitecture();
-		build_platform.compiler = this.name;
+		import std.process;
+		import std.string;
+
+		auto fil = generatePlatformProbeFile();
+
+		string[] arch_flags;
+
+		switch (arch_override) {
+			default: throw new Exception("Unsupported architecture: "~arch_override);
+			case "": break;
+			case "x86": arch_flags = ["-m32"]; break;
+			case "x86_64": arch_flags = ["-m64"]; break;
+		}
+		settings.addDFlags(arch_flags);
+
+		auto compiler_result = execute(compiler_binary ~ arch_flags ~ ["-o", (getTempDir()~"dub_platform_probe").toNativeString(), fil.toNativeString()]);
+		enforce(compiler_result.status == 0, format("Failed to invoke the compiler %s to determine the build platform: %s",
+			compiler_binary, compiler_result.output));
+		auto result = execute([(getTempDir()~"dub_platform_probe").toNativeString()]);
+		enforce(result.status == 0, format("Failed to invoke the build platform probe: %s",
+			result.output));
+
+		auto build_platform = readPlatformProbe(result.output);
 		build_platform.compilerBinary = compiler_binary;
 
-		enforce(arch_override.length == 0, "Architecture override not implemented for GDC.");
+		if (build_platform.compiler != this.name) {
+			logWarn(`The determined compiler type "%s" doesn't match the expected type "%s". This will probably result in build errors.`,
+				build_platform.compiler, this.name);
+		}
+
+		if (arch_override.length && !build_platform.architecture.canFind(arch_override)) {
+			logWarn(`Failed to apply the selected architecture %s. Got %s.`,
+				arch_override, build_platform.architecture);
+		}
+
 		return build_platform;
 	}