xcbuild: assorted fixes and cleanups

This is in preparation for the LLVM 4 upgrade (which gets more strict
about e.g., return false in xcbuild itself) and also for using xcbuild
more extensively in the Darwin stdenv bootstrap process, which is why I
killed the unnecessary gcc dependency in the toolchain. llvm-cov pretends
to be gcov anyway, so we're fine.

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/development/compilers/llvm/4/clang/default.nix b/pkgs/development/compilers/llvm/4/clang/default.nix
index 6ce63209935c..c93871592830 100644
--- a/pkgs/development/compilers/llvm/4/clang/default.nix
+++ b/pkgs/development/compilers/llvm/4/clang/default.nix
@@ -53,6 +53,7 @@ let
     passthru = {
       lib = self; # compatibility with gcc, so that `stdenv.cc.cc.lib` works on both
       isClang = true;
+      inherit llvm;
     } // stdenv.lib.optionalAttrs stdenv.isLinux {
       inherit gcc;
     };