[PATCH] Introduce llvm::sys::path::home_directory.

[David Majnemer]

================
Comment at: lib/Support/Unix/Path.inc:805
@@ +804,3 @@
+
+  return false;
+}
----------------
Have you considered falling back to `getpwuid_r` on SUSv3? Something like:
  bufsize = 2048;

  #ifdef _SC_GETPW_R_SIZE_MAX
  if ((getpw_r_size_max = sysconf(_SC_GETPW_R_SIZE_MAX)) > 0)
    bufsize = (size_t)getpw_r_size_max;
  #endif

  uid = getuid();

  buf = NULL;
  do {
    if ((tbuf = realloc(buf, bufsize)) == NULL) {
      free(buf);
      return false;
    }
    buf = tbuf;
    err = getpwuid_r(uid, &pw, buf, bufsize, &tpw);
    bufsize *= 2;
  } while (err == ERANGE);

  if (err) {
    free(buf);
    return false;
  }

  if (!tpw || !pw.pw_dir)
    return false;

  result.append(pw.pw_dir, pw.pw_dir + strlen(pw.pw_dir));
  return true;


http://llvm-reviews.chandlerc.com/D2199