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--- a/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
+++ b/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
@@ -9,6 +9,7 @@
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
+import Foundation
import TSCBasic
import SwiftOptions
@@ -116,7 +117,20 @@ extension GenericUnixToolchain {
// just using `clang` and avoid a dependency on the C++ runtime.
let clangTool: Tool =
parsedOptions.hasArgument(.enableExperimentalCxxInterop) ? .clangxx : .clang
- var clangPath = try getToolPath(clangTool)
+
+ // For Nix, prefer linking using the wrapped system clang, instead of using
+ // the unwrapped clang packaged with swift. The latter is unable to link, but
+ // we still want to use it for other purposes (clang importer).
+ var clangPath: AbsolutePath
+ let env = ProcessInfo.processInfo.environment
+ if let nixCC = env["NIX_CC"],
+ let binPath = try? AbsolutePath(validating: "\(nixCC)/bin"),
+ let tool = lookupExecutablePath(filename: parsedOptions.hasArgument(.enableExperimentalCxxInterop)
+ ? "clang++" : "clang",
+ searchPaths: [binPath]) {
+ clangPath = tool
+ } else {
+ clangPath = try getToolPath(clangTool)
if let toolsDirPath = parsedOptions.getLastArgument(.toolsDirectory) {
// FIXME: What if this isn't an absolute path?
let toolsDir = try AbsolutePath(validating: toolsDirPath.asSingle)
@@ -132,6 +146,7 @@ extension GenericUnixToolchain {
commandLine.appendFlag("-B")
commandLine.appendPath(toolsDir)
}
+ } // nixCC
// Executables on Linux get -pie
if targetTriple.os == .linux && linkerOutputType == .executable {
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