Add `-build-mode=obj`

src/build_settings.cpp

@@ -81,6 +81,12 @@ struct QueryDataSetSettings {
 	bool compact;
 };
 
+enum BuildModeKind {
+	BuildMode_Executable,
+	BuildMode_DynamicLibrary,
+	BuildMode_Object,
+};
+
 
 // This stores the information for the specify architecture of this build
 struct BuildContext {
@@ -114,7 +120,7 @@ struct BuildContext {
 	String llc_flags;
 	String target_triplet;
 	String link_flags;
-	bool   is_dll;
+	BuildModeKind build_mode;
 	bool   generate_docs;
 	i32    optimization_level;
 	bool   show_timings;

src/checker.cpp

@@ -4131,7 +4131,7 @@ void check_parsed_files(Checker *c) {
 
 
 	TIME_SECTION("check entry point");
-	if (!build_context.is_dll) {
+	if (build_context.build_mode == BuildMode_Executable) {
 		Scope *s = c->info.init_scope;
 		GB_ASSERT(s != nullptr);
 		GB_ASSERT(s->flags&ScopeFlag_Init);

src/ir.cpp

@@ -12137,7 +12137,7 @@ void ir_gen_tree(irGen *s) {
 
 
 #if defined(GB_SYSTEM_WINDOWS)
-	if (build_context.is_dll && !has_dll_main) {
+	if (build_context.build_mode == BuildMode_DynamicLibrary && !has_dll_main) {
 		// DllMain :: proc(inst: rawptr, reason: u32, reserved: rawptr) -> i32
 		String name = str_lit("DllMain");
 		Type *proc_params = alloc_type_tuple();
@@ -12208,7 +12208,7 @@ void ir_gen_tree(irGen *s) {
 		ir_emit_return(proc, v_one32);
 	}
 #endif
-	if (!(build_context.is_dll && !has_dll_main)) {
+	if (!(build_context.build_mode == BuildMode_DynamicLibrary && !has_dll_main)) {
 		// main :: proc(argc: i32, argv: ^^u8) -> i32
 		String name = str_lit("main");
 
@@ -12287,7 +12287,7 @@ void ir_gen_tree(irGen *s) {
 	}
 
 #if defined(GB_SYSTEM_WINDOWS)
-	// if (!m->build_context->is_dll && !has_win_main) {
+	// if (m->build_context->build_mode != BuildMode_DynamicLibrary && !has_win_main) {
 	// 	// proc WinMain(inst, prev: rawptr, cmd_line: ^byte, cmd_show: i32) -> i32
 	// 	String name = str_lit("WinMain");
 	// 	Type *proc_params = alloc_type_tuple();
@@ -12331,7 +12331,7 @@ void ir_gen_tree(irGen *s) {
 	// 	ir_emit_return(proc, v_one32);
 	// 	ir_end_procedure_body(proc);
 	// }
-	if (!build_context.is_dll && build_context.no_crt) {
+	if (build_context.build_mode != BuildMode_DynamicLibrary && build_context.no_crt) {
 		s->print_chkstk = true;
 
 		{

src/ir_print.cpp

@@ -2382,10 +2382,8 @@ void ir_print_proc(irFileBuffer *f, irModule *m, irProcedure *proc) {
 	} else {
 		ir_write_byte(f, '\n');
 		ir_write_str_lit(f, "define ");
-		if (build_context.is_dll) {
-			if (proc->is_export) {
-				ir_write_str_lit(f, "dllexport ");
-			}
+		if (proc->is_export) {
+			ir_write_str_lit(f, "dllexport ");
 		}
 		// if (!proc->is_export && !proc->is_foreign && !proc->is_entry_point) {
 			// ir_write_string(f, "internal ");
@@ -2735,10 +2733,8 @@ void print_llvm_ir(irGen *ir) {
 		if (g->is_foreign) {
 			ir_write_string(f, str_lit("external "));
 		}
-		if (build_context.is_dll) {
-			if (g->is_export) {
-				ir_write_string(f, str_lit("dllexport "));
-			}
+		if (g->is_export) {
+			ir_write_string(f, str_lit("dllexport "));
 		}
 
 		if (g->is_private) {

src/llvm_backend.cpp

@@ -11594,7 +11594,7 @@ void lb_generate_code(lbGenerator *gen) {
 		}*/
 	}
 
-	if (!(build_context.is_dll && !has_dll_main)) {
+	if (!(build_context.build_mode == BuildMode_DynamicLibrary && !has_dll_main)) {
 		Type *params  = alloc_type_tuple();
 		Type *results = alloc_type_tuple();
 

src/main.cpp

@@ -195,7 +195,7 @@ i32 linker_stage(lbGenerator *gen) {
 
 
 
-		if (build_context.is_dll) {
+		if (build_context.build_mode == BuildMode_DynamicLibrary) {
 			output_ext = "dll";
 			link_settings = gb_string_append_fmt(link_settings, " /DLL");
 		} else {
@@ -346,7 +346,7 @@ i32 linker_stage(lbGenerator *gen) {
 		String output_ext = {};
 		char const *link_settings = "";
 		char const *linker;
-		if (build_context.is_dll) {
+		if (build_context.build_mode == BuildMode_DynamicLibrary) {
 			// Shared libraries are .dylib on MacOS and .so on Linux.
 			#if defined(GB_SYSTEM_OSX)
 				output_ext = STR_LIT(".dylib");
@@ -969,9 +969,11 @@ bool parse_build_flags(Array<String> args) {
 							}
 
 							if (str == "dll" || str == "shared") {
-								build_context.is_dll = true;
+								build_context.build_mode = BuildMode_DynamicLibrary;
+							} else if (str == "obj" || str == "object") {
+								build_context.build_mode = BuildMode_Object;
 							} else if (str == "exe") {
-								build_context.is_dll = false;
+								build_context.build_mode = BuildMode_Executable;
 							} else {
 								gb_printf_err("Unknown build mode '%.*s'\n", LIT(str));
 								bad_flags = true;
@@ -1208,12 +1210,14 @@ void remove_temp_files(String output_base) {
 	} while (0)
 	EXT_REMOVE(".ll");
 	EXT_REMOVE(".bc");
-#if defined(GB_SYSTEM_WINDOWS)
-	EXT_REMOVE(".obj");
-	EXT_REMOVE(".res");
-#else
-	EXT_REMOVE(".o");
-#endif
+	if (build_context.build_mode != BuildMode_Object) {
+	#if defined(GB_SYSTEM_WINDOWS)
+		EXT_REMOVE(".obj");
+		EXT_REMOVE(".res");
+	#else
+		EXT_REMOVE(".o");
+	#endif
+	}
 
 #undef EXT_REMOVE
 }
@@ -1602,9 +1606,11 @@ int main(int arg_count, char const **arg_ptr) {
 		}
 		lb_generate_code(&gen);
 
-		i32 linker_stage_exit_count = linker_stage(&gen);
-		if (linker_stage_exit_count != 0) {
-			return linker_stage_exit_count;
+		if (build_context.build_mode != BuildMode_Object) {
+			i32 linker_stage_exit_count = linker_stage(&gen);
+			if (linker_stage_exit_count != 0) {
+				return linker_stage_exit_count;
+			}
 		}
 
 		if (build_context.show_timings) {
@@ -1697,6 +1703,16 @@ int main(int arg_count, char const **arg_ptr) {
 			return exit_code;
 		}
 
+		if (build_context.build_mode == BuildMode_Object) {
+			// Ignore the linker
+			if (build_context.show_timings) {
+				show_timings(&checker, timings);
+			}
+
+			remove_temp_files(output_base);
+			return exit_code;
+		}
+
 		if (build_context.cross_compiling && selected_target_metrics->metrics == &target_essence_amd64) {
 	#ifdef GB_SYSTEM_UNIX
 			system_exec_command_line_app("linker", "x86_64-essence-gcc \"%.*s.o\" -o \"%.*s\" %.*s",
@@ -1752,7 +1768,7 @@ int main(int arg_count, char const **arg_ptr) {
 
 
 
-			if (build_context.is_dll) {
+			if (build_context.build_mode == BuildMode_DynamicLibrary) {
 				output_ext = "dll";
 				link_settings = gb_string_append_fmt(link_settings, "/DLL");
 			} else {
@@ -1904,7 +1920,7 @@ int main(int arg_count, char const **arg_ptr) {
 			String output_ext = {};
 			char const *link_settings = "";
 			char const *linker;
-			if (build_context.is_dll) {
+			if (build_context.build_mode == BuildMode_DynamicLibrary) {
 				// Shared libraries are .dylib on MacOS and .so on Linux.
 				#if defined(GB_SYSTEM_OSX)
 					output_ext = STR_LIT(".dylib");