failures:

---- cfg::cfg_looks_at_rustflags_for_target stdout ----
        running `/home/build/aports/community/rust/src/rustc-1.27.0-src/build/x86_64-alpine-linux-musl/stage2-tools/x86_64-alpine-linux-musl/release/cargo build --target x86_64-unkn
own-linux-gnu`
thread 'cfg::cfg_looks_at_rustflags_for_target' panicked at '
Expected: execs
    but: exited with exit code: 101
--- stdout

--- stderr
   Compiling b v0.0.1 (file:///home/build/aports/community/rust/src/rustc-1.27.0-src/build/x86_64-alpine-linux-musl/stage2-tools/x86_64-alpine-linux-musl/cit/t356/foo/b)
error[E0463]: can't find crate for `std`
  |
  = note: the `x86_64-unknown-linux-gnu` target may not be installed

--- a/src/tools/cargo/tests/testsuite/cfg.rs
+++ b/src/tools/cargo/tests/testsuite/cfg.rs
@@ -449,7 +449,7 @@ fn cfg_looks_at_rustflags_for_target() {
         .build();
 
     assert_that(
-        p.cargo("build --target x86_64-unknown-linux-gnu")
+        p.cargo("build --target x86_64-alpine-linux-musl")
             .env("RUSTFLAGS", "--cfg with_b"),
         execs().with_status(0),
     );