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Add ThinLTO support via -lto:thin and -lto:thin-files flags

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- Add -lto:thin and -lto:thin-files CLI flags with validation
- Emit LLVM bitcode (.bc) instead of object files when LTO is enabled
- Pass -flto=thin and -flto-jobs to clang/lld linkers
- Guard linkage corrections to skip declarations without definitions
  (required for LTO where declarations appear across modules)
- Allow module-per-file with LTO even at higher optimization levels

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Jesse Meyer
2026-02-01 09:04:53 -05:00
parent f7901cffc9
commit 43ad4a1d9f
5 changed files with 78 additions and 7 deletions
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16
src/linker.cpp
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@@ -328,6 +328,12 @@ try_cross_linking:;
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));
gbString lld_lto_flags = gb_string_make(heap_allocator(), "");
defer (gb_string_free(lld_lto_flags));
if (build_context.lto_kind != LTO_None) {
lld_lto_flags = gb_string_append_fmt(lld_lto_flags, "/lldltojobs:%d ", build_context.thread_count);
}
switch (build_context.linker_choice) {
case Linker_lld:
result = system_exec_command_line_app("msvc-lld-link",
@@ -336,13 +342,15 @@ try_cross_linking:;
"%.*s "
"%.*s "
"%s "
"%s "
"",
LIT(build_context.ODIN_ROOT), object_files, LIT(output_filename),
link_settings,
LIT(windows_subsystem_names[build_context.ODIN_WINDOWS_SUBSYSTEM]),
LIT(build_context.link_flags),
LIT(build_context.extra_linker_flags),
lib_str
lib_str,
lld_lto_flags
);
if (result) {
@@ -966,6 +974,12 @@ try_cross_linking:;
link_command_line = gb_string_appendc(link_command_line, clang_path);
}
link_command_line = gb_string_appendc(link_command_line, " -Wno-unused-command-line-argument ");
if (build_context.lto_kind != LTO_None) {
link_command_line = gb_string_appendc(link_command_line, " -flto=thin");
link_command_line = gb_string_append_fmt(link_command_line, " -flto-jobs=%d ", build_context.thread_count);
}
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);