Enable lld for windows
Bug: http://b/110800681
The following flags that the binutils linkers support are not available
in lld for Windows:
-soname
--no-undefined
-rpath
Windows also uses "import libraries", which are stub libraries used only
for linking. The binutils linkers accepted a DLL and treated them as an
import library. But lld issues the following error:
lld-link: error: ...DLL: bad file type. Did you specify a DLL instead
of an import library?
To resolve this, pass '-out-implib=libFoo.a' to lld when linking
libFoo.dll. Add libFoo.a as an implicit output to the 'ld' build rule.
Rewrite the shared libraries for a library/binary to use the import
library instead of the DLL. As a side-effect, this also (correctly)
uses the AdbWinApi.a that's alongside
development/host/windows/prebuilt/usb/AdbWinApi.dll
Test: Run Windows tests (go/android-llvm-windows-testing) and check
absence of regressions.
Change-Id: I15a178589aa6882caa6e7e38650cc6ef48109764
diff --git a/cc/binary.go b/cc/binary.go
index cae1739..7f7c600 100644
--- a/cc/binary.go
+++ b/cc/binary.go
@@ -384,7 +384,7 @@
TransformObjToDynamicBinary(ctx, objs.objFiles, sharedLibs, deps.StaticLibs,
deps.LateStaticLibs, deps.WholeStaticLibs, linkerDeps, deps.CrtBegin, deps.CrtEnd, true,
- builderFlags, outputFile)
+ builderFlags, outputFile, nil)
objs.coverageFiles = append(objs.coverageFiles, deps.StaticLibObjs.coverageFiles...)
objs.coverageFiles = append(objs.coverageFiles, deps.WholeStaticLibObjs.coverageFiles...)
diff --git a/cc/builder.go b/cc/builder.go
index 97ae806..dab887c 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -26,6 +26,7 @@
"strings"
"github.com/google/blueprint"
+ "github.com/google/blueprint/pathtools"
"android/soong/android"
"android/soong/cc/config"
@@ -597,7 +598,7 @@
// and shared libraries, to a shared library (.so) or dynamic executable
func TransformObjToDynamicBinary(ctx android.ModuleContext,
objFiles, sharedLibs, staticLibs, lateStaticLibs, wholeStaticLibs, deps android.Paths,
- crtBegin, crtEnd android.OptionalPath, groupLate bool, flags builderFlags, outputFile android.WritablePath) {
+ crtBegin, crtEnd android.OptionalPath, groupLate bool, flags builderFlags, outputFile android.WritablePath, implicitOutputs android.WritablePaths) {
ldCmd := "${config.ClangBin}/clang++"
@@ -634,7 +635,11 @@
}
for _, lib := range sharedLibs {
- libFlagsList = append(libFlagsList, lib.String())
+ libFile := lib.String()
+ if ctx.Windows() {
+ libFile = pathtools.ReplaceExtension(libFile, "a")
+ }
+ libFlagsList = append(libFlagsList, libFile)
}
deps = append(deps, staticLibs...)
@@ -645,11 +650,12 @@
}
ctx.Build(pctx, android.BuildParams{
- Rule: ld,
- Description: "link " + outputFile.Base(),
- Output: outputFile,
- Inputs: objFiles,
- Implicits: deps,
+ Rule: ld,
+ Description: "link " + outputFile.Base(),
+ Output: outputFile,
+ ImplicitOutputs: implicitOutputs,
+ Inputs: objFiles,
+ Implicits: deps,
Args: map[string]string{
"ldCmd": ldCmd,
"crtBegin": crtBegin.String(),
diff --git a/cc/library.go b/cc/library.go
index 8b666ed..7216832 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -347,9 +347,10 @@
)
}
} else {
- f = append(f,
- "-shared",
- "-Wl,-soname,"+libName+flags.Toolchain.ShlibSuffix())
+ f = append(f, "-shared")
+ if !ctx.Windows() {
+ f = append(f, "-Wl,-soname,"+libName+flags.Toolchain.ShlibSuffix())
+ }
}
flags.LdFlags = append(f, flags.LdFlags...)
@@ -673,6 +674,14 @@
outputFile := android.PathForModuleOut(ctx, fileName)
ret := outputFile
+ var implicitOutputs android.WritablePaths
+ if ctx.Windows() {
+ importLibraryPath := android.PathForModuleOut(ctx, pathtools.ReplaceExtension(fileName, "a"))
+
+ flags.LdFlags = append(flags.LdFlags, "-Wl,--out-implib="+importLibraryPath.String())
+ implicitOutputs = append(implicitOutputs, importLibraryPath)
+ }
+
builderFlags := flagsToBuilderFlags(flags)
// Optimize out relinking against shared libraries whose interface hasn't changed by
@@ -724,7 +733,7 @@
TransformObjToDynamicBinary(ctx, objs.objFiles, sharedLibs,
deps.StaticLibs, deps.LateStaticLibs, deps.WholeStaticLibs,
- linkerDeps, deps.CrtBegin, deps.CrtEnd, false, builderFlags, outputFile)
+ linkerDeps, deps.CrtBegin, deps.CrtEnd, false, builderFlags, outputFile, implicitOutputs)
objs.coverageFiles = append(objs.coverageFiles, deps.StaticLibObjs.coverageFiles...)
objs.coverageFiles = append(objs.coverageFiles, deps.WholeStaticLibObjs.coverageFiles...)
diff --git a/cc/linker.go b/cc/linker.go
index fd958ba..179a998 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -290,10 +290,6 @@
if ctx.Darwin() {
return false
}
- // http://b/110800681 - lld cannot link Android's Windows modules yet.
- if ctx.Windows() {
- return false
- }
if linker.Properties.Use_clang_lld != nil {
return Bool(linker.Properties.Use_clang_lld)
}
@@ -347,7 +343,7 @@
// darwin defaults to treating undefined symbols as errors
flags.LdFlags = append(flags.LdFlags, "-Wl,-undefined,dynamic_lookup")
}
- } else if !ctx.Darwin() {
+ } else if !ctx.Darwin() && !ctx.Windows() {
flags.LdFlags = append(flags.LdFlags, "-Wl,--no-undefined")
}
@@ -384,7 +380,7 @@
flags.LdFlags = append(flags.LdFlags, proptools.NinjaAndShellEscapeList(linker.Properties.Ldflags)...)
- if ctx.Host() {
+ if ctx.Host() && !ctx.Windows() {
rpath_prefix := `\$$ORIGIN/`
if ctx.Darwin() {
rpath_prefix = "@loader_path/"