Add -linker:<string> to replace -lld and -radlink

src/build_settings.cpp

@@ -344,6 +344,22 @@ struct BuildCacheData {
 	bool copy_already_done;
 };
 
+
+enum LinkerChoice : i32 {
+	Linker_Invalid = -1,
+	Linker_Default = 0,
+	Linker_lld,
+	Linker_radlink,
+
+	Linker_COUNT,
+};
+
+String linker_choices[Linker_COUNT] = {
+	str_lit("default"),
+	str_lit("lld"),
+	str_lit("radlink"),
+};
+
 // This stores the information for the specify architecture of this build
 struct BuildContext {
 	// Constants
@@ -419,13 +435,13 @@ struct BuildContext {
 	bool   no_rpath;
 	bool   no_entry_point;
 	bool   no_thread_local;
-	bool   use_lld;
-	bool   use_radlink;
 	bool   cross_compiling;
 	bool   different_os;
 	bool   keep_object_files;
 	bool   disallow_do;
 
+	LinkerChoice linker_choice;
+
 	StringSet custom_attributes;
 
 	bool   strict_style;
@@ -1872,7 +1888,7 @@ gb_internal bool init_build_paths(String init_filename) {
 				return false;
 			}
 
-			if (!build_context.use_lld && !build_context.use_radlink && find_result.vs_exe_path.len == 0) {
+			if (build_context.linker_choice != Linker_Default && find_result.vs_exe_path.len == 0) {
 				gb_printf_err("link.exe not found.\n");
 				return false;
 			}

src/linker.cpp

@@ -167,10 +167,10 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 
 		if (is_windows) {
 			String section_name = str_lit("msvc-link");
-			if (build_context.use_lld) {
+			switch (build_context.linker_choice) {
-				section_name = str_lit("lld-link");
+			case Linker_Default:  break;
-			} else if (build_context.use_radlink) {
+			case Linker_lld:      section_name = str_lit("lld-link"); break;
-				section_name = str_lit("rad-link");
+			case Linker_radlink:  section_name = str_lit("rad-link"); break;
 			}
 			timings_start_section(timings, section_name);
 
@@ -306,7 +306,8 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 			String windows_sdk_bin_path = path_to_string(heap_allocator(), build_context.build_paths[BuildPath_Win_SDK_Bin_Path]);
 			defer (gb_free(heap_allocator(), windows_sdk_bin_path.text));
 
-			if (build_context.use_lld) { // lld
+			switch (build_context.linker_choice) {
+			case Linker_lld:
 				result = system_exec_command_line_app("msvc-lld-link",
 					"\"%.*s\\bin\\lld-link\" %s -OUT:\"%.*s\" %s "
 					"/nologo /incremental:no /opt:ref /subsystem:%.*s "
@@ -325,7 +326,8 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 				if (result) {
 					return result;
 				}
-			} else if (build_context.use_radlink)  {
+				break;
+			case Linker_radlink:
 				result = system_exec_command_line_app("msvc-rad-link",
 					"\"%.*s\\bin\\radlink\" %s -OUT:\"%.*s\" %s "
 					"/nologo /incremental:no /opt:ref /subsystem:%.*s "
@@ -344,7 +346,8 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 				if (result) {
 					return result;
 				}
-			} else { // msvc
+				break;
+			default: { // msvc
 				String res_path = quote_path(heap_allocator(), build_context.build_paths[BuildPath_RES]);
 				String rc_path  = quote_path(heap_allocator(), build_context.build_paths[BuildPath_RC]);
 				defer (gb_free(heap_allocator(), res_path.text));
@@ -405,6 +408,8 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 				if (result) {
 					return result;
 				}
+				break;
+			}
 			}
 		} else {
 			timings_start_section(timings, str_lit("ld-link"));
@@ -700,7 +705,7 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 			link_command_line = gb_string_append_fmt(link_command_line, " %.*s ", LIT(build_context.extra_linker_flags));
 			link_command_line = gb_string_append_fmt(link_command_line, " %s ", link_settings);
 
-			if (build_context.use_lld) {
+			if (build_context.linker_choice == Linker_lld) {
 				link_command_line = gb_string_append_fmt(link_command_line, " -fuse-ld=lld");
 				result = system_exec_command_line_app("lld-link", link_command_line);
 			} else {

src/main.cpp

@@ -329,6 +329,7 @@ enum BuildFlagKind {
 	BuildFlag_NoEntryPoint,
 	BuildFlag_UseLLD,
 	BuildFlag_UseRADLink,
+	BuildFlag_Linker,
 	BuildFlag_UseSeparateModules,
 	BuildFlag_NoThreadedChecker,
 	BuildFlag_ShowDebugMessages,
@@ -541,6 +542,7 @@ gb_internal bool parse_build_flags(Array<String> args) {
 	add_flag(&build_flags, BuildFlag_NoEntryPoint,            str_lit("no-entry-point"),            BuildFlagParam_None,    Command__does_check &~ Command_test);
 	add_flag(&build_flags, BuildFlag_UseLLD,                  str_lit("lld"),                       BuildFlagParam_None,    Command__does_build);
 	add_flag(&build_flags, BuildFlag_UseRADLink,              str_lit("radlink"),                   BuildFlagParam_None,    Command__does_build);
+	add_flag(&build_flags, BuildFlag_Linker,                  str_lit("Linker"),                    BuildFlagParam_String,  Command__does_build);
 	add_flag(&build_flags, BuildFlag_UseSeparateModules,      str_lit("use-separate-modules"),      BuildFlagParam_None,    Command__does_build);
 	add_flag(&build_flags, BuildFlag_NoThreadedChecker,       str_lit("no-threaded-checker"),       BuildFlagParam_None,    Command__does_check);
 	add_flag(&build_flags, BuildFlag_ShowDebugMessages,       str_lit("show-debug-messages"),       BuildFlagParam_None,    Command_all);
@@ -1203,19 +1205,38 @@ gb_internal bool parse_build_flags(Array<String> args) {
 							build_context.no_thread_local = true;
 							break;
 						case BuildFlag_UseLLD:
-							if (build_context.use_radlink) {
+							gb_printf_err("Warning: Use of -lld has been deprecated in favour of -linker:lld\n");
-								gb_printf_err("-lld cannot be used along side -radlink\n");
+							build_context.linker_choice = Linker_lld;
-								bad_flags = true;
-							}
-							build_context.use_lld = true;
 							break;
 						case BuildFlag_UseRADLink:
-							if (build_context.use_lld) {
+							gb_printf_err("Warning: Use of -lld has been deprecated in favour of -linker:radlink\n");
-								gb_printf_err("-radlink cannot be used along side -lld\n");
+							build_context.linker_choice = Linker_radlink;
-								bad_flags = true;
-							}
-							build_context.use_radlink = true;
 							break;
+						case BuildFlag_Linker:
+							{
+								GB_ASSERT(value.kind == ExactValue_String);
+								LinkerChoice linker_choice = Linker_Invalid;
+
+								for (i32 i = 0; i < Linker_COUNT; i++) {
+									if (linker_choices[i] == value.value_string) {
+										linker_choice = cast(LinkerChoice)i;
+										break;
+									}
+								}
+
+								if (linker_choice == Linker_Invalid) {
+									gb_printf_err("Invalid option for -linker:<string>. Expected one of the following\n");
+									for (i32 i = 0; i < Linker_COUNT; i++) {
+										gb_printf_err("\t%.*s\n", LIT(linker_choices[i]));
+									}
+									bad_flags = true;
+								} else {
+									build_context.linker_choice = linker_choice;
+								}
+							}
+							break;
+
+
 						case BuildFlag_UseSeparateModules:
 							build_context.use_separate_modules = true;
 							break;
@@ -2400,6 +2421,14 @@ gb_internal void print_show_help(String const arg0, String const &command) {
 	}
 
 	if (run_or_build) {
+		print_usage_line(1, "-linker:<string>");
+		print_usage_line(2, "Specify the linker to use.");
+		print_usage_line(2, "Choices:");
+		for (i32 i = 0; i < Linker_COUNT; i++) {
+			print_usage_line(3, "%.*s", LIT(linker_choices[i]));
+		}
+		print_usage_line(0, "");
+
 		print_usage_line(1, "-lld");
 		print_usage_line(2, "Uses the LLD linker rather than the default.");
 		print_usage_line(0, "");