1 files changed, 9 insertions, 0 deletions
diff --git a/libc/test/UnitTest/Test.h b/libc/test/UnitTest/Test.h
index a5a2a3c..e70fc51 100644
--- a/libc/test/UnitTest/Test.h
+++ b/libc/test/UnitTest/Test.h
@@ -52,4 +52,13 @@
     libc_errno = 0;                                                            \
   } while (0)
 
+// Some macro utility to append file names with LIBC_TEST macro's value to be
+// used in stdio tests.
+#undef STR
+#undef EVAL_THEN_STR
+#define STR(X) #X
+#define EVAL_THEN_STR(X) STR(X)
+
+#define APPEND_LIBC_TEST(X) X "." EVAL_THEN_STR(LIBC_TEST)
+
 #endif // LLVM_LIBC_TEST_UNITTEST_TEST_H