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/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...)