Default to "smart" linker behaviour; Add -min-link-libs to use minimize link libs if wanted

src/build_settings.cpp

@@ -412,7 +412,9 @@ struct BuildContext {
 
 	bool   dynamic_map_calls;
 
-	bool obfuscate_source_code_locations;
+	bool   obfuscate_source_code_locations;
+
+	bool   min_link_libs;
 
 	RelocMode reloc_mode;
 	bool   disable_red_zone;

src/linker.cpp

@@ -139,9 +139,9 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 			}
 
 
-			StringSet libs = {};
+			StringSet min_libs_set = {};
-			string_set_init(&libs, 64);
+			string_set_init(&min_libs_set, 64);
-			defer (string_set_destroy(&libs));
+			defer (string_set_destroy(&min_libs_set));
 
 			StringSet asm_files = {};
 			string_set_init(&asm_files, 64);
@@ -149,6 +149,11 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 
 			for (Entity *e : gen->foreign_libraries) {
 				GB_ASSERT(e->kind == Entity_LibraryName);
+				// NOTE(bill): Add these before the linking values
+				String extra_linker_flags = string_trim_whitespace(e->LibraryName.extra_linker_flags);
+				if (extra_linker_flags.len != 0) {
+					lib_str = gb_string_append_fmt(lib_str, " %.*s", LIT(extra_linker_flags));
+				}
 				for_array(i, e->LibraryName.paths) {
 					String lib = string_trim_whitespace(e->LibraryName.paths[i]);
 					// IMPORTANT NOTE(bill): calling `string_to_lower` here is not an issue because
@@ -162,12 +167,11 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 						if (!string_set_update(&asm_files, lib)) {
 							String asm_file = asm_files.entries[i].value;
 							String obj_file = concatenate_strings(permanent_allocator(), asm_file, str_lit(".obj"));
-							String obj_format;
+							String obj_format = str_lit("win64");
-#if defined(GB_ARCH_64_BIT)
+						#if defined(GB_ARCH_32_BIT)
-							obj_format = str_lit("win64");
-#elif defined(GB_ARCH_32_BIT)
 							obj_format = str_lit("win32");
-#endif // GB_ARCH_*_BIT
+						#endif
+
 							result = system_exec_command_line_app("nasm",
 								"\"%.*s\\bin\\nasm\\windows\\nasm.exe\" \"%.*s\" "
 								"-f \"%.*s\" "
@@ -185,21 +189,13 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 							}
 							array_add(&gen->output_object_paths, obj_file);
 						}
-					} else {
+					} else if (!string_set_update(&min_libs_set, lib) ||
-						if (!string_set_update(&libs, lib)) {
+					           !build_context.min_link_libs) {
-							lib_str = gb_string_append_fmt(lib_str, " \"%.*s\"", LIT(lib));
+						lib_str = gb_string_append_fmt(lib_str, " \"%.*s\"", LIT(lib));
-						}
 					}
 				}
 			}
 
-			for (Entity *e : gen->foreign_libraries) {
-				GB_ASSERT(e->kind == Entity_LibraryName);
-				if (e->LibraryName.extra_linker_flags.len != 0) {
-					lib_str = gb_string_append_fmt(lib_str, " %.*s", LIT(e->LibraryName.extra_linker_flags));
-				}
-			}
-
 			if (build_context.build_mode == BuildMode_DynamicLibrary) {
 				link_settings = gb_string_append_fmt(link_settings, " /DLL");
 			} else {
@@ -318,12 +314,17 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 			string_set_init(&asm_files, 64);
 			defer (string_set_destroy(&asm_files));
 			
-			StringSet libs = {};
+			StringSet min_libs_set = {};
-			string_set_init(&libs, 64);
+			string_set_init(&min_libs_set, 64);
-			defer (string_set_destroy(&libs));
+			defer (string_set_destroy(&min_libs_set));
 			
 			for (Entity *e : gen->foreign_libraries) {
 				GB_ASSERT(e->kind == Entity_LibraryName);
+				// NOTE(bill): Add these before the linking values
+				String extra_linker_flags = string_trim_whitespace(e->LibraryName.extra_linker_flags);
+				if (extra_linker_flags.len != 0) {
+					lib_str = gb_string_append_fmt(lib_str, " %.*s", LIT(extra_linker_flags));
+				}
 				for (String lib : e->LibraryName.paths) {
 					lib = string_trim_whitespace(lib);
 					if (lib.len == 0) {
@@ -336,19 +337,19 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 						String asm_file = lib;
 						String obj_file = concatenate_strings(permanent_allocator(), asm_file, str_lit(".o"));
 						String obj_format;
-#if defined(GB_ARCH_64_BIT)
+					#if defined(GB_ARCH_64_BIT)
 						if (is_osx) {
 							obj_format = str_lit("macho64");
 						} else {
 							obj_format = str_lit("elf64");
 						}
-#elif defined(GB_ARCH_32_BIT)
+					#elif defined(GB_ARCH_32_BIT)
 						if (is_osx) {
 							obj_format = str_lit("macho32");
 						} else {
 							obj_format = str_lit("elf32");
 						}
-#endif // GB_ARCH_*_BIT
+					#endif // GB_ARCH_*_BIT
 
 						if (is_osx) {
 							// `as` comes with MacOS.
@@ -383,7 +384,7 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 						}
 						array_add(&gen->output_object_paths, obj_file);
 					} else {
-						if (string_set_update(&libs, lib)) {
+						if (string_set_update(&min_libs_set, lib) && build_context.min_link_libs) {
 							continue;
 						}
 
@@ -433,13 +434,6 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 				}
 			}
 
-			for (Entity *e : gen->foreign_libraries) {
-				GB_ASSERT(e->kind == Entity_LibraryName);
-				if (e->LibraryName.extra_linker_flags.len != 0) {
-					lib_str = gb_string_append_fmt(lib_str, " %.*s", LIT(e->LibraryName.extra_linker_flags));
-				}
-			}
-
 			gbString object_files = gb_string_make(heap_allocator(), "");
 			defer (gb_string_free(object_files));
 			for (String object_path : gen->output_object_paths) {

src/main.cpp

@@ -296,6 +296,8 @@ enum BuildFlagKind {
 	BuildFlag_ErrorPosStyle,
 	BuildFlag_MaxErrorCount,
 
+	BuildFlag_MinLinkLibs,
+
 	// internal use only
 	BuildFlag_InternalIgnoreLazy,
 	BuildFlag_InternalIgnoreLLVMBuild,
@@ -485,6 +487,8 @@ gb_internal bool parse_build_flags(Array<String> args) {
 	add_flag(&build_flags, BuildFlag_ErrorPosStyle,           str_lit("error-pos-style"),           BuildFlagParam_String,  Command_all);
 	add_flag(&build_flags, BuildFlag_MaxErrorCount,           str_lit("max-error-count"),           BuildFlagParam_Integer, Command_all);
 
+	add_flag(&build_flags, BuildFlag_MinLinkLibs,             str_lit("min-link-libs"),             BuildFlagParam_None,    Command__does_build);
+
 	add_flag(&build_flags, BuildFlag_InternalIgnoreLazy,      str_lit("internal-ignore-lazy"),      BuildFlagParam_None,    Command_all);
 	add_flag(&build_flags, BuildFlag_InternalIgnoreLLVMBuild, str_lit("internal-ignore-llvm-build"),BuildFlagParam_None,    Command_all);
 
@@ -1215,6 +1219,10 @@ gb_internal bool parse_build_flags(Array<String> args) {
 							break;
 						}
 
+						case BuildFlag_MinLinkLibs:
+							build_context.min_link_libs = true;
+							break;
+
 						case BuildFlag_InternalIgnoreLazy:
 							build_context.ignore_lazy = true;
 							break;
@@ -2008,6 +2016,11 @@ gb_internal void print_show_help(String const arg0, String const &command) {
 		print_usage_line(2, "If not set, the default max error count is %d.", DEFAULT_MAX_ERROR_COLLECTOR_COUNT);
 		print_usage_line(0, "");
 
+		print_usage_line(1, "-min-link-libs");
+		print_usage_line(2, "If set, the number of linked libraries will be minimized to prevent duplications.");
+		print_usage_line(2, "This is useful for so called \"dumb\" linkers compared to \"smart\" linkers.");
+		print_usage_line(0, "");
+
 		print_usage_line(1, "-foreign-error-procedures");
 		print_usage_line(2, "States that the error procedures used in the runtime are defined in a separate translation unit.");
 		print_usage_line(0, "");