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5274aa53b3eefc661e48fb66befd3e75f7bc4177
Odin/src/linker.cpp
Dave Voutila 5274aa53b3 Fix linker invocation on OpenBSD. 
Firstly, we need to explicitly request pthreads and also need to
mind the fact ports (like SDL2) install in /usr/local/lib.

Secondly, since OpenBSD 7.4 the system enforces indirect branch
targets on hardware platforms that support it. Until the LLVM
integration in Odin can be changed to emit proper branch targets
(e.g. endbr64 on amd64), we need to request the linker make the
resulting program opt-out of enforcement.
2025-03-27 10:37:36 -04:00

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28 KiB
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struct LinkerData {
BlockingMutex foreign_mutex;
PtrSet<Entity *> foreign_libraries_set;
Array<Entity *> foreign_libraries;
Array<String> output_object_paths;
Array<String> output_temp_paths;
String output_base;
String output_name;
#if defined(GB_SYSTEM_OSX)
b8 needs_system_library_linked;
#endif
};
gb_internal i32 system_exec_command_line_app(char const *name, char const *fmt, ...);
gb_internal bool system_exec_command_line_app_output(char const *command, gbString *output);
#if defined(GB_SYSTEM_OSX)
gb_internal void linker_enable_system_library_linking(LinkerData *ld) {
ld->needs_system_library_linked = 1;
}
#endif
gb_internal void linker_data_init(LinkerData *ld, CheckerInfo *info, String const &init_fullpath) {
gbAllocator ha = heap_allocator();
array_init(&ld->output_object_paths, ha);
array_init(&ld->output_temp_paths, ha);
array_init(&ld->foreign_libraries, ha, 0, 1024);
ptr_set_init(&ld->foreign_libraries_set, 1024);
#if defined(GB_SYSTEM_OSX)
ld->needs_system_library_linked = 0;
#endif
if (build_context.out_filepath.len == 0) {
ld->output_name = remove_directory_from_path(init_fullpath);
ld->output_name = remove_extension_from_path(ld->output_name);
ld->output_name = string_trim_whitespace(ld->output_name);
if (ld->output_name.len == 0) {
ld->output_name = info->init_scope->pkg->name;
}
ld->output_base = ld->output_name;
} else {
ld->output_name = build_context.out_filepath;
ld->output_name = string_trim_whitespace(ld->output_name);
if (ld->output_name.len == 0) {
ld->output_name = info->init_scope->pkg->name;
}
isize pos = string_extension_position(ld->output_name);
if (pos < 0) {
ld->output_base = ld->output_name;
} else {
ld->output_base = substring(ld->output_name, 0, pos);
}
}
ld->output_base = path_to_full_path(ha, ld->output_base);
}
gb_internal i32 linker_stage(LinkerData *gen) {
i32 result = 0;
Timings *timings = &global_timings;
String output_filename = path_to_string(heap_allocator(), build_context.build_paths[BuildPath_Output]);
debugf("Linking %.*s\n", LIT(output_filename));
// TOOD(Jeroen): Make a `build_paths[BuildPath_Object] to avoid `%.*s.o`.
if (is_arch_wasm()) {
timings_start_section(timings, str_lit("wasm-ld"));
gbString lib_str = gb_string_make(heap_allocator(), "");
gbString extra_orca_flags = gb_string_make(temporary_allocator(), "");
gbString inputs = gb_string_make(temporary_allocator(), "");
inputs = gb_string_append_fmt(inputs, "\"%.*s.o\"", LIT(output_filename));
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 = e->LibraryName.paths[i];
if (lib.len == 0) {
continue;
}
if (!string_ends_with(lib, str_lit(".o"))) {
continue;
}
inputs = gb_string_append_fmt(inputs, " \"%.*s\"", LIT(lib));
}
}
if (build_context.metrics.os == TargetOs_orca) {
gbString orca_sdk_path = gb_string_make(temporary_allocator(), "");
if (!system_exec_command_line_app_output("orca sdk-path", &orca_sdk_path)) {
gb_printf_err("executing `orca sdk-path` failed, make sure Orca is installed and added to your path\n");
return 1;
}
if (gb_string_length(orca_sdk_path) == 0) {
gb_printf_err("executing `orca sdk-path` did not produce output\n");
return 1;
}
inputs = gb_string_append_fmt(inputs, " \"%s/orca-libc/lib/crt1.o\" \"%s/orca-libc/lib/libc.o\"", orca_sdk_path, orca_sdk_path);
extra_orca_flags = gb_string_append_fmt(extra_orca_flags, " -L \"%s/bin\" -lorca_wasm --export-dynamic", orca_sdk_path);
}
#if defined(GB_SYSTEM_WINDOWS)
result = system_exec_command_line_app("wasm-ld",
"\"%.*s\\bin\\wasm-ld\" %s -o \"%.*s\" %.*s %.*s %s %s",
LIT(build_context.ODIN_ROOT),
inputs, LIT(output_filename), LIT(build_context.link_flags), LIT(build_context.extra_linker_flags),
lib_str,
extra_orca_flags);
#else
result = system_exec_command_line_app("wasm-ld",
"wasm-ld %s -o \"%.*s\" %.*s %.*s %s %s",
inputs, LIT(output_filename),
LIT(build_context.link_flags),
LIT(build_context.extra_linker_flags),
lib_str,
extra_orca_flags);
#endif
return result;
}
if (build_context.cross_compiling && selected_target_metrics->metrics == &target_essence_amd64) {
#if defined(GB_SYSTEM_UNIX)
result = system_exec_command_line_app("linker", "x86_64-essence-gcc \"%.*s.o\" -o \"%.*s\" %.*s %.*s",
LIT(output_filename), LIT(output_filename), LIT(build_context.link_flags), LIT(build_context.extra_linker_flags));
#else
gb_printf_err("Linking for cross compilation for this platform is not yet supported (%.*s %.*s)\n",
LIT(target_os_names[build_context.metrics.os]),
LIT(target_arch_names[build_context.metrics.arch])
);
#endif
} else if (build_context.cross_compiling && build_context.different_os) {
gb_printf_err("Linking for cross compilation for this platform is not yet supported (%.*s %.*s)\n",
LIT(target_os_names[build_context.metrics.os]),
LIT(target_arch_names[build_context.metrics.arch])
);
build_context.keep_object_files = true;
} else {
#if defined(GB_SYSTEM_WINDOWS)
bool is_windows = true;
#else
bool is_windows = false;
#endif
#if defined(GB_SYSTEM_OSX)
bool is_osx = true;
#else
bool is_osx = false;
#endif
if (is_windows) {
String section_name = str_lit("msvc-link");
switch (build_context.linker_choice) {
case Linker_Default: break;
case Linker_lld: section_name = str_lit("lld-link"); break;
case Linker_radlink: section_name = str_lit("rad-link"); break;
}
timings_start_section(timings, section_name);
gbString lib_str = gb_string_make(heap_allocator(), "");
defer (gb_string_free(lib_str));
gbString link_settings = gb_string_make_reserve(heap_allocator(), 256);
defer (gb_string_free(link_settings));
// Add library search paths.
if (build_context.build_paths[BuildPath_VS_LIB].basename.len > 0) {
String path = {};
auto add_path = [&](String path) {
if (path[path.len-1] == '\\') {
path.len -= 1;
}
link_settings = gb_string_append_fmt(link_settings, " /LIBPATH:\"%.*s\"", LIT(path));
};
add_path(build_context.build_paths[BuildPath_Win_SDK_UM_Lib].basename);
add_path(build_context.build_paths[BuildPath_Win_SDK_UCRT_Lib].basename);
add_path(build_context.build_paths[BuildPath_VS_LIB].basename);
}
StringSet min_libs_set = {};
string_set_init(&min_libs_set, 64);
defer (string_set_destroy(&min_libs_set));
String prev_lib = {};
StringSet asm_files = {};
string_set_init(&asm_files, 64);
defer (string_set_destroy(&asm_files));
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
// we will never uses these strings afterwards
string_to_lower(&lib);
if (lib.len == 0) {
continue;
}
if (has_asm_extension(lib)) {
if (!string_set_update(&asm_files, lib)) {
String asm_file = lib;
String obj_file = {};
String temp_dir = temporary_directory(temporary_allocator());
if (temp_dir.len != 0) {
String filename = filename_without_directory(asm_file);
gbString str = gb_string_make(heap_allocator(), "");
str = gb_string_append_length(str, temp_dir.text, temp_dir.len);
str = gb_string_appendc(str, "/");
str = gb_string_append_length(str, filename.text, filename.len);
str = gb_string_append_fmt(str, "-%p.obj", asm_file.text);
obj_file = make_string_c(str);
} else {
obj_file = concatenate_strings(permanent_allocator(), asm_file, str_lit(".obj"));
}
String obj_format = str_lit("win64");
#if defined(GB_ARCH_32_BIT)
obj_format = str_lit("win32");
#endif
result = system_exec_command_line_app("nasm",
"\"%.*s\\bin\\nasm\\windows\\nasm.exe\" \"%.*s\" "
"-f \"%.*s\" "
"-o \"%.*s\" "
"%.*s "
"",
LIT(build_context.ODIN_ROOT), LIT(asm_file),
LIT(obj_format),
LIT(obj_file),
LIT(build_context.extra_assembler_flags)
);
if (result) {
return result;
}
array_add(&gen->output_object_paths, obj_file);
}
} else if (!string_set_update(&min_libs_set, lib) ||
!build_context.min_link_libs) {
if (prev_lib != lib) {
lib_str = gb_string_append_fmt(lib_str, " \"%.*s\"", LIT(lib));
}
prev_lib = lib;
}
}
}
if (build_context.build_mode == BuildMode_DynamicLibrary) {
link_settings = gb_string_append_fmt(link_settings, " /DLL");
} else {
link_settings = gb_string_append_fmt(link_settings, " /ENTRY:mainCRTStartup");
}
if (build_context.pdb_filepath != "") {
String pdb_path = path_to_string(heap_allocator(), build_context.build_paths[BuildPath_PDB]);
link_settings = gb_string_append_fmt(link_settings, " /PDB:\"%.*s\"", LIT(pdb_path));
}
if (build_context.build_mode != BuildMode_StaticLibrary) {
if (build_context.no_crt) {
link_settings = gb_string_append_fmt(link_settings, " /nodefaultlib");
} else {
link_settings = gb_string_append_fmt(link_settings, " /defaultlib:libcmt");
}
}
if (build_context.ODIN_DEBUG) {
link_settings = gb_string_append_fmt(link_settings, " /DEBUG");
}
gbString object_files = gb_string_make(heap_allocator(), "");
defer (gb_string_free(object_files));
for (String const &object_path : gen->output_object_paths) {
object_files = gb_string_append_fmt(object_files, "\"%.*s\" ", LIT(object_path));
}
String vs_exe_path = path_to_string(heap_allocator(), build_context.build_paths[BuildPath_VS_EXE]);
defer (gb_free(heap_allocator(), vs_exe_path.text));
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));
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 "
"%.*s "
"%.*s "
"%s "
"",
LIT(build_context.ODIN_ROOT), object_files, LIT(output_filename),
link_settings,
LIT(build_context.ODIN_WINDOWS_SUBSYSTEM),
LIT(build_context.link_flags),
LIT(build_context.extra_linker_flags),
lib_str
);
if (result) {
return result;
}
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 "
"%.*s "
"%.*s "
"%s "
"",
LIT(build_context.ODIN_ROOT), object_files, LIT(output_filename),
link_settings,
LIT(build_context.ODIN_WINDOWS_SUBSYSTEM),
LIT(build_context.link_flags),
LIT(build_context.extra_linker_flags),
lib_str
);
if (result) {
return result;
}
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));
defer (gb_free(heap_allocator(), rc_path.text));
if (build_context.has_resource) {
if (build_context.build_paths[BuildPath_RC].basename == "") {
debugf("Using precompiled resource %.*s\n", LIT(res_path));
} else {
debugf("Compiling resource %.*s\n", LIT(res_path));
result = system_exec_command_line_app("msvc-link",
"\"%.*src.exe\" /nologo /fo %.*s %.*s",
LIT(windows_sdk_bin_path),
LIT(res_path),
LIT(rc_path)
);
if (result) {
return result;
}
}
} else {
res_path = {};
}
String linker_name = str_lit("link.exe");
switch (build_context.build_mode) {
case BuildMode_Executable:
link_settings = gb_string_append_fmt(link_settings, " /NOIMPLIB /NOEXP");
break;
}
switch (build_context.build_mode) {
case BuildMode_StaticLibrary:
linker_name = str_lit("lib.exe");
break;
default:
link_settings = gb_string_append_fmt(link_settings, " /incremental:no /opt:ref");
break;
}
result = system_exec_command_line_app("msvc-link",
"\"%.*s%.*s\" %s %.*s -OUT:\"%.*s\" %s "
"/nologo /subsystem:%.*s "
"%.*s "
"%.*s "
"%s "
"",
LIT(vs_exe_path), LIT(linker_name), object_files, LIT(res_path), LIT(output_filename),
link_settings,
LIT(build_context.ODIN_WINDOWS_SUBSYSTEM),
LIT(build_context.link_flags),
LIT(build_context.extra_linker_flags),
lib_str
);
if (result) {
return result;
}
break;
}
}
} else {
timings_start_section(timings, str_lit("ld-link"));
// Link using `clang`, unless overridden by `ODIN_CLANG_PATH` environment variable.
const char* clang_path = gb_get_env("ODIN_CLANG_PATH", permanent_allocator());
if (clang_path == NULL) {
clang_path = "clang";
}
// NOTE(vassvik): get cwd, for used for local shared libs linking, since those have to be relative to the exe
char cwd[256];
#if !defined(GB_SYSTEM_WINDOWS)
getcwd(&cwd[0], 256);
#endif
//printf("%s\n", cwd);
// NOTE(vassvik): needs to add the root to the library search paths, so that the full filenames of the library
// files can be passed with -l:
gbString lib_str = gb_string_make(heap_allocator(), "-L/");
defer (gb_string_free(lib_str));
StringSet asm_files = {};
string_set_init(&asm_files, 64);
defer (string_set_destroy(&asm_files));
StringSet min_libs_set = {};
string_set_init(&min_libs_set, 64);
defer (string_set_destroy(&min_libs_set));
String prev_lib = {};
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));
}
if (build_context.metrics.os == TargetOs_darwin) {
// Print frameworks first
for (String lib : e->LibraryName.paths) {
lib = string_trim_whitespace(lib);
if (lib.len == 0) {
continue;
}
if (string_ends_with(lib, str_lit(".framework"))) {
if (string_set_update(&min_libs_set, lib)) {
continue;
}
String lib_name = lib;
lib_name = remove_extension_from_path(lib_name);
lib_str = gb_string_append_fmt(lib_str, " -framework %.*s ", LIT(lib_name));
}
}
}
for (String lib : e->LibraryName.paths) {
lib = string_trim_whitespace(lib);
if (lib.len == 0) {
continue;
}
if (has_asm_extension(lib)) {
if (string_set_update(&asm_files, lib)) {
continue; // already handled
}
String asm_file = lib;
String obj_file = {};
String temp_dir = temporary_directory(temporary_allocator());
if (temp_dir.len != 0) {
String filename = filename_without_directory(asm_file);
gbString str = gb_string_make(heap_allocator(), "");
str = gb_string_append_length(str, temp_dir.text, temp_dir.len);
str = gb_string_appendc(str, "/");
str = gb_string_append_length(str, filename.text, filename.len);
str = gb_string_append_fmt(str, "-%p.o", asm_file.text);
obj_file = make_string_c(str);
} else {
obj_file = concatenate_strings(permanent_allocator(), asm_file, str_lit(".o"));
}
String obj_format;
#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)
if (is_osx) {
obj_format = str_lit("macho32");
} else {
obj_format = str_lit("elf32");
}
#endif // GB_ARCH_*_BIT
if (build_context.metrics.arch == TargetArch_riscv64) {
result = system_exec_command_line_app("clang",
"%s \"%.*s\" "
"-c -o \"%.*s\" "
"-target %.*s -march=rv64gc "
"%.*s "
"",
clang_path,
LIT(asm_file),
LIT(obj_file),
LIT(build_context.metrics.target_triplet),
LIT(build_context.extra_assembler_flags)
);
} else if (is_osx) {
// `as` comes with MacOS.
result = system_exec_command_line_app("as",
"as \"%.*s\" "
"-o \"%.*s\" "
"%.*s "
"",
LIT(asm_file),
LIT(obj_file),
LIT(build_context.extra_assembler_flags)
);
} else {
// Note(bumbread): I'm assuming nasm is installed on the host machine.
// Shipping binaries on unix-likes gets into the weird territorry of
// "which version of glibc" is it linked with.
result = system_exec_command_line_app("nasm",
"nasm \"%.*s\" "
"-f \"%.*s\" "
"-o \"%.*s\" "
"%.*s "
"",
LIT(asm_file),
LIT(obj_format),
LIT(obj_file),
LIT(build_context.extra_assembler_flags)
);
if (result) {
gb_printf_err("executing `nasm` to assemble foreing import of %.*s failed.\n\tSuggestion: `nasm` does not ship with the compiler and should be installed with your system's package manager.\n", LIT(asm_file));
return result;
}
}
array_add(&gen->output_object_paths, obj_file);
} else {
bool short_circuit = false;
if (string_ends_with(lib, str_lit(".framework"))) {
short_circuit = true;
} else if (string_ends_with(lib, str_lit(".dylib"))) {
short_circuit = true;
} else if (string_ends_with(lib, str_lit(".so"))) {
short_circuit = true;
} else if (e->LibraryName.ignore_duplicates) {
short_circuit = true;
}
if (string_set_update(&min_libs_set, lib) && (build_context.min_link_libs || short_circuit)) {
continue;
}
if (prev_lib == lib) {
continue;
}
prev_lib = lib;
// Do not add libc again, this is added later already, and omitted with
// the `-no-crt` flag, not skipping here would cause duplicate library
// warnings when linking on darwin and might link libc silently even with `-no-crt`.
if (lib == str_lit("System.framework") || lib == str_lit("c")) {
continue;
}
if (build_context.metrics.os == TargetOs_darwin) {
if (string_ends_with(lib, str_lit(".framework"))) {
// framework thingie
String lib_name = lib;
lib_name = remove_extension_from_path(lib_name);
lib_str = gb_string_append_fmt(lib_str, " -framework %.*s ", LIT(lib_name));
} else if (string_ends_with(lib, str_lit(".a")) || string_ends_with(lib, str_lit(".o")) || string_ends_with(lib, str_lit(".dylib"))) {
// For:
// object
// dynamic lib
// static libs, absolute full path relative to the file in which the lib was imported from
lib_str = gb_string_append_fmt(lib_str, " %.*s ", LIT(lib));
} else {
// dynamic or static system lib, just link regularly searching system library paths
lib_str = gb_string_append_fmt(lib_str, " -l%.*s ", LIT(lib));
}
} else {
// NOTE(vassvik): static libraries (.a files) in linux can be linked to directly using the full path,
// since those are statically linked to at link time. shared libraries (.so) has to be
// available at runtime wherever the executable is run, so we make require those to be
// local to the executable (unless the system collection is used, in which case we search
// the system library paths for the library file).
if (string_ends_with(lib, str_lit(".a")) || string_ends_with(lib, str_lit(".o")) || string_ends_with(lib, str_lit(".so")) || string_contains_string(lib, str_lit(".so."))) {
lib_str = gb_string_append_fmt(lib_str, " -l:\"%.*s\" ", LIT(lib));
} else {
// dynamic or static system lib, just link regularly searching system library paths
lib_str = gb_string_append_fmt(lib_str, " -l%.*s ", LIT(lib));
}
}
}
}
}
gbString object_files = gb_string_make(heap_allocator(), "");
defer (gb_string_free(object_files));
for (String object_path : gen->output_object_paths) {
object_files = gb_string_append_fmt(object_files, "\"%.*s\" ", LIT(object_path));
}
gbString link_settings = gb_string_make_reserve(heap_allocator(), 32);
if (build_context.no_crt) {
link_settings = gb_string_append_fmt(link_settings, "-nostdlib ");
}
if (build_context.build_mode == BuildMode_StaticLibrary) {
compiler_error("TODO(bill): -build-mode:static on non-windows targets");
}
// NOTE(dweiler): We use clang as a frontend for the linker as there are
// other runtime and compiler support libraries that need to be linked in
// very specific orders such as libgcc_s, ld-linux-so, unwind, etc.
// These are not always typically inside /lib, /lib64, or /usr versions
// of that, e.g libgcc.a is in /usr/lib/gcc/{version}, and can vary on
// the distribution of Linux even. The gcc or clang specs is the only
// reliable way to query this information to call ld directly.
if (build_context.build_mode == BuildMode_DynamicLibrary) {
// NOTE(dweiler): Let the frontend know we're building a shared library
// so it doesn't generate symbols which cannot be relocated.
link_settings = gb_string_appendc(link_settings, "-shared ");
// NOTE(dweiler): _odin_entry_point must be called at initialization
// time of the shared object, similarly, _odin_exit_point must be called
// at deinitialization. We can pass both -init and -fini to the linker by
// using a comma separated list of arguments to -Wl.
//
// This previously used ld but ld cannot actually build a shared library
// correctly this way since all the other dependencies provided implicitly
// by the compiler frontend are still needed and most of the command
// line arguments prepared previously are incompatible with ld.
if (build_context.metrics.os == TargetOs_darwin) {
link_settings = gb_string_appendc(link_settings, "-Wl,-init,'__odin_entry_point' ");
// NOTE(weshardee): __odin_exit_point should also be added, but -fini
// does not exist on MacOS
} else {
link_settings = gb_string_appendc(link_settings, "-Wl,-init,'_odin_entry_point' ");
link_settings = gb_string_appendc(link_settings, "-Wl,-fini,'_odin_exit_point' ");
}
}
if (build_context.build_mode == BuildMode_Executable && build_context.reloc_mode == RelocMode_PIC) {
// Do not disable PIE, let the linker choose. (most likely you want it enabled)
} else if (build_context.build_mode != BuildMode_DynamicLibrary) {
if (build_context.metrics.os != TargetOs_openbsd
&& build_context.metrics.os != TargetOs_haiku
&& build_context.metrics.arch != TargetArch_riscv64
) {
// OpenBSD and Haiku default to PIE executable. do not pass -no-pie for it.
link_settings = gb_string_appendc(link_settings, "-no-pie ");
}
}
gbString platform_lib_str = gb_string_make(heap_allocator(), "");
defer (gb_string_free(platform_lib_str));
if (build_context.metrics.os == TargetOs_darwin) {
platform_lib_str = gb_string_appendc(platform_lib_str, "-Wl,-syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -L/usr/local/lib ");
// Homebrew's default library path, checking if it exists to avoid linking warnings.
if (gb_file_exists("/opt/homebrew/lib")) {
platform_lib_str = gb_string_appendc(platform_lib_str, "-L/opt/homebrew/lib ");
}
// MacPort's default library path, checking if it exists to avoid linking warnings.
if (gb_file_exists("/opt/local/lib")) {
platform_lib_str = gb_string_appendc(platform_lib_str, "-L/opt/local/lib ");
}
// Only specify this flag if the user has given a minimum version to target.
// This will cause warnings to show up for mismatched libraries.
if (build_context.minimum_os_version_string_given) {
link_settings = gb_string_append_fmt(link_settings, "-mmacosx-version-min=%.*s ", LIT(build_context.minimum_os_version_string));
}
if (build_context.build_mode != BuildMode_DynamicLibrary) {
// This points the linker to where the entry point is
link_settings = gb_string_appendc(link_settings, "-e _main ");
}
} else if (build_context.metrics.os == TargetOs_openbsd) {
// OpenBSD ports install shared libraries in /usr/local/lib. Also, we must explicitly link libpthread.
platform_lib_str = gb_string_appendc(platform_lib_str, "-lpthread -Wl,-L/usr/local/lib ");
// Until the LLVM back-end can be adapted to emit endbr64 instructions on amd64, we
// need to pass -z nobtcfi in order to allow the resulting program to run under
// OpenBSD 7.4 and newer. Once support is added at compile time, this can be dropped.
platform_lib_str = gb_string_appendc(platform_lib_str, "-Wl,-z,nobtcfi ");
}
if (!build_context.no_rpath) {
// Set the rpath to the $ORIGIN/@loader_path (the path of the executable),
// so that dynamic libraries are looked for at that path.
if (build_context.metrics.os == TargetOs_darwin) {
link_settings = gb_string_appendc(link_settings, "-Wl,-rpath,@loader_path ");
} else {
link_settings = gb_string_appendc(link_settings, "-Wl,-rpath,\\$ORIGIN ");
}
}
if (!build_context.no_crt) {
platform_lib_str = gb_string_appendc(platform_lib_str, "-lm ");
if (build_context.metrics.os == TargetOs_darwin) {
// NOTE: adding this causes a warning about duplicate libraries, I think it is
// automatically assumed/added by clang when you don't do `-nostdlib`.
// platform_lib_str = gb_string_appendc(platform_lib_str, "-lSystem ");
} else {
platform_lib_str = gb_string_appendc(platform_lib_str, "-lc ");
}
}
gbString link_command_line = gb_string_make(heap_allocator(), clang_path);
defer (gb_string_free(link_command_line));
link_command_line = gb_string_appendc(link_command_line, " -Wno-unused-command-line-argument ");
link_command_line = gb_string_appendc(link_command_line, object_files);
link_command_line = gb_string_append_fmt(link_command_line, " -o \"%.*s\" ", LIT(output_filename));
link_command_line = gb_string_append_fmt(link_command_line, " %s ", platform_lib_str);
link_command_line = gb_string_append_fmt(link_command_line, " %s ", lib_str);
link_command_line = gb_string_append_fmt(link_command_line, " %.*s ", LIT(build_context.link_flags));
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.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 {
result = system_exec_command_line_app("ld-link", link_command_line);
}
if (result) {
return result;
}
if (is_osx && build_context.ODIN_DEBUG) {
// NOTE: macOS links DWARF symbols dynamically. Dsymutil will map the stubs in the exe
// to the symbols in the object file
result = system_exec_command_line_app("dsymutil", "dsymutil \"%.*s\"", LIT(output_filename));
if (result) {
return result;
}
}
}
}
return result;
}
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