1 files changed, 34 insertions, 0 deletions
diff --git a/tests/cxx/libbuiltins.cc b/tests/cxx/libbuiltins.cc
new file mode 100644
index 0000000..d2cdd3e
--- /dev/null
+++ b/tests/cxx/libbuiltins.cc
@@ -0,0 +1,34 @@
+//===--- libbuiltins.cc - test input file for iwyu ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// Library builtins are, like normal builtins, compiled down to an intrinsic,
+// but a header still needs to be included for the program to be valid. The math
+// library (std::pow, std::round, etc) is a typical example.
+
+// IWYU_ARGS: -I .
+
+#include "tests/cxx/libbuiltins-direct.h"
+
+float kapow(float x) {
+  // IWYU: std::pow is...*cmath
+  return std::pow(x, 2.0F);
+}
+
+/**** IWYU_SUMMARY
+
+tests/cxx/libbuiltins.cc should add these lines:
+#include <cmath>
+
+tests/cxx/libbuiltins.cc should remove these lines:
+- #include "tests/cxx/libbuiltins-direct.h"  // lines XX-XX
+
+The full include-list for tests/cxx/libbuiltins.cc:
+#include <cmath>  // for pow
+
+***** IWYU_SUMMARY */