Add USE_CLANG_LLD and use_clang_lld.
* USE_CLANG_LLD is unedefined in current builds.
* When USE_CLANG_LLD is defined to 'true' or '1',
use clang's lld instead of ld or ld.gold.
* When lld is enabled:
* ld-only flags are not passed to 'lld'.
* location_packer is disabled.
* Use new lld's --pack-dyn-relocs=android.
* When lld does not work:
* In Android.mk files use LOCAL_USE_CLANG_LLD := false.
* In Android.bp files use use_clang_lld: false.
* Only arm, arm64, x86, and x86_64_devices have LLD flags;
all other hosts and targets do not call lld yet.
Bug: 73768157
Test: make checkbuild and boot
Change-Id: I06b8a1e868a600997a7e70fe05c299d751d23d5f
diff --git a/cc/config/clang.go b/cc/config/clang.go
index 46d6fe2..1323849 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -83,6 +83,15 @@
"--enable-stdcall-fixup",
})
+// Ldflags that should be filtered out when linking with clang lld
+var ClangUnknownLldflags = sorted([]string{
+ "-fuse-ld=gold",
+ "-Wl,--icf=safe",
+ "-Wl,--fix-cortex-a8",
+ "-Wl,--no-fix-cortex-a8",
+ "-Wl,-m,aarch64_elf64_le_vec",
+})
+
var ClangLibToolingUnknownCflags = []string{
"-flto*",
"-fsanitize*",
@@ -182,6 +191,17 @@
return ret
}
+func ClangFilterUnknownLldflags(lldflags []string) []string {
+ ret := make([]string, 0, len(lldflags))
+ for _, f := range lldflags {
+ if !inListSorted(f, ClangUnknownLldflags) {
+ ret = append(ret, f)
+ }
+ }
+
+ return ret
+}
+
func inListSorted(s string, list []string) bool {
for _, l := range list {
if s == l {