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/arm_device.go b/cc/config/arm_device.go
index 66b3b38..02bd9eb 100644
--- a/cc/config/arm_device.go
+++ b/cc/config/arm_device.go
@@ -39,6 +39,8 @@
"-Wl,-m,armelf",
}
+ armLldflags = ClangFilterUnknownLldflags(armLdflags)
+
armArmCflags = []string{
"-fstrict-aliasing",
}
@@ -169,6 +171,7 @@
pctx.StaticVariable("ArmToolchainCflags", strings.Join(armToolchainCflags, " "))
pctx.StaticVariable("ArmCflags", strings.Join(armCflags, " "))
pctx.StaticVariable("ArmLdflags", strings.Join(armLdflags, " "))
+ pctx.StaticVariable("ArmLldflags", strings.Join(armLldflags, " "))
pctx.StaticVariable("ArmCppflags", strings.Join(armCppflags, " "))
pctx.StaticVariable("ArmIncludeFlags", bionicHeaders("arm"))
@@ -196,6 +199,7 @@
pctx.StaticVariable("ArmToolchainClangCflags", strings.Join(ClangFilterUnknownCflags(armToolchainCflags), " "))
pctx.StaticVariable("ArmClangCflags", strings.Join(ClangFilterUnknownCflags(armCflags), " "))
pctx.StaticVariable("ArmClangLdflags", strings.Join(ClangFilterUnknownCflags(armLdflags), " "))
+ pctx.StaticVariable("ArmClangLldflags", strings.Join(ClangFilterUnknownCflags(armLldflags), " "))
pctx.StaticVariable("ArmClangCppflags", strings.Join(ClangFilterUnknownCflags(armCppflags), " "))
// Clang ARM vs. Thumb instruction set cflags
@@ -274,6 +278,7 @@
type toolchainArm struct {
toolchain32Bit
ldflags string
+ lldflags string
toolchainCflags, toolchainClangCflags string
}
@@ -350,6 +355,10 @@
return t.ldflags
}
+func (t *toolchainArm) ClangLldflags() string {
+ return t.lldflags // TODO: handle V8 cases
+}
+
func (t *toolchainArm) ClangInstructionSetFlags(isa string) (string, error) {
switch isa {
case "arm":
@@ -403,6 +412,7 @@
"${config.ArmLdflags}",
fixCortexA8,
}, " "),
+ lldflags: "${config.ArmLldflags}",
toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
}
}