# Patch the Go compiler so that we can have a say (using a NIX_GOWORKDIR env variable)
# as to the temporary directory it uses for linking, since that directory path ends up
# in the string table and .gnu.version_d ELF header.
#

{ go }:

go.overrideDerivation (oldAttrs: {
  postPatch = (oldAttrs.postPatch or "") + ''
    substituteInPlace "src/cmd/go/internal/work/action.go" --replace-quiet \
      'tmp, err := ioutil.TempDir(os.Getenv("GOTMPDIR"), "go-build")' \
      'var err error
      tmp := os.Getenv("NIX_GOWORKDIR")
      if tmp == "" {
          tmp, err = ioutil.TempDir(os.Getenv("GOTMPDIR"), "go-build")
      }'
  '';
})