Defer to clang for --hash-style.

We fixed the clang driver to "do the right thing" based on target api level years ago, but these manual workarounds predate that (or were copy & pasted from places that predated that). We don't need them any more.

See https://github.com/android/ndk/issues/2005 for more detail.

Change-Id: I995741b8606e389e8de8272f1cc532624516245a

cc/config/arm64_device.go

@@ -49,7 +49,6 @@ var (
 	}
 
 	arm64Ldflags = []string{
-		"-Wl,--hash-style=gnu",
 		"-Wl,-z,separate-code",
 		"-Wl,-z,separate-loadable-segments",
 	}

cc/config/arm64_linux_host.go

@@ -42,7 +42,6 @@ var (
 		"-Wl,-z,now",
 		"-Wl,--build-id=md5",
 		"-Wl,--fatal-warnings",
-		"-Wl,--hash-style=gnu",
 		"-Wl,--no-undefined-version",
 	}
 

cc/config/arm_device.go

@@ -38,7 +38,6 @@ var (
   }
 
 	armLdflags = []string{
-		"-Wl,--hash-style=gnu",
 		"-Wl,-m,armelf",
 		// Revert this after b/322359235 is fixed
 		"-Wl,-mllvm", "-Wl,-enable-shrink-wrap=false",

cc/config/riscv64_device.go

@@ -42,11 +42,6 @@ var (
 	riscv64ArchVariantCflags = map[string][]string{}
 
 	riscv64Ldflags = []string{
-		// TODO: sysv hashes are the default for other architectures because gnu
-		// hashes weren't supported until api level 23, but riscv64 didn't exist
-		// back then, and could move today...
-		// https://android.googlesource.com/platform/bionic/+/main/android-changes-for-ndk-developers.md#gnu-hashes-availible-in-api-level-23
-		"-Wl,--hash-style=gnu",
 		// This is already the driver's Android default, but duplicated here (and
 		// above) for ease of experimentation with additional extensions.
 		"-march=rv64gcv_zba_zbb_zbs",

cc/config/x86_64_device.go

@@ -30,7 +30,6 @@ var (
 	x86_64Cppflags = []string{}
 
 	x86_64Ldflags = []string{
-		"-Wl,--hash-style=gnu",
 		"-Wl,-z,separate-loadable-segments",
 	}
 

cc/config/x86_device.go

@@ -33,9 +33,7 @@ var (
 
 	x86Cppflags = []string{}
 
-	x86Ldflags = []string{
-		"-Wl,--hash-style=gnu",
-	}
+	x86Ldflags = []string{}
 
 	x86ArchVariantCflags = map[string][]string{
 		"": []string{

cc/config/x86_linux_bionic_host.go

@@ -46,7 +46,6 @@ var (
 		"-Wl,-z,now",
 		"-Wl,--build-id=md5",
 		"-Wl,--fatal-warnings",
-		"-Wl,--hash-style=gnu",
 		"-Wl,--no-undefined-version",
 
 		// Use the device gcc toolchain

cc/linker.go

@@ -530,13 +530,6 @@ func (linker *baseLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
 		flags.Global.LdFlags = append(flags.Global.LdFlags, RpathFlags(ctx)...)
 	}
 
-	if ctx.useSdk() {
-		// The bionic linker now has support gnu style hashes (which are much faster!), but shipping
-		// to older devices requires the old style hash. Fortunately, we can build with both and
-		// it'll work anywhere.
-		flags.Global.LdFlags = append(flags.Global.LdFlags, "-Wl,--hash-style=both")
-	}
-
 	flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ToolchainLdflags())
 
 	// Version_script is not needed when linking stubs lib where the version