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Add USE_CLANG_LLD and use_clang_lld.

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* 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
This commit is contained in:
Chih-Hung Hsieh
2018-04-03 11:33:34 -07:00
parent 18f568f651
commit 02b4da53a7
20 changed files with 178 additions and 4 deletions
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10
cc/config/x86_linux_host.go
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@@ -241,10 +241,20 @@ func (t *toolchainLinuxX86) ClangLdflags() string {
return "${config.LinuxClangLdflags} ${config.LinuxX86ClangLdflags}"
}
func (t *toolchainLinuxX86) ClangLldflags() string {
// TODO: define and use Linux*ClangLldflags
return "${config.LinuxClangLdflags} ${config.LinuxX86ClangLdflags}"
}
func (t *toolchainLinuxX8664) ClangLdflags() string {
return "${config.LinuxClangLdflags} ${config.LinuxX8664ClangLdflags}"
}
func (t *toolchainLinuxX8664) ClangLldflags() string {
// TODO: define and use Linux*ClangLldflags
return "${config.LinuxClangLdflags} ${config.LinuxX8664ClangLdflags}"
}
func (t *toolchainLinuxX86) YasmFlags() string {
return "${config.LinuxX86YasmFlags}"
}