================
@@ -2651,6 +2639,21 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args)
const {
const std::string OSVersionStr = OSVersion.getAsString();
// Set the tool chain target information.
if (Platform == MacOS) {
+#ifdef CLANG_USE_XCSELECT
+ // If we don't have an SDK yet and are on macOS, try to inject one using
+ // xcselect, except when passed --no-xcselect.
+ if (!Args.hasArg(options::OPT_no_xcselect) &&
+ !Args.getLastArg(options::OPT_isysroot) && !::getenv("SDKROOT") &&
+ !SDKInfo) {
+ char *p;
+ if (!::xcselect_host_sdk_path(CLANG_XCSELECT_HOST_SDK_POLICY, &p)) {
+ Args.append(Args.MakeSeparateArg(
+ nullptr, Opts.getOption(options::OPT_isysroot), p));
+ ::free(p);
+ SDKInfo = parseSDKSettings(getVFS(), Args, getDriver());
+ }
+ }
----------------
carlocab wrote:
I wonder if we should also skip this if `--sysroot` is passed.
If we do that, we can also drop the `--no-xcselect` flag and use `--sysroot=""`
instead. Though I suppose doing that in the tests would be less transparent.
https://github.com/llvm/llvm-project/pull/186683
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