versioner: compile headers in both C and C++ mode.

Bug: https://github.com/android-ndk/ndk/issues/440
Test: python run_tests.py
Change-Id: Ib572a8fdcc00f6b88a25003a085b16ce9698d692
diff --git a/tools/versioner/tests/extern_cpp_mismatch/headers/string.h b/tools/versioner/tests/extern_cpp_mismatch/headers/string.h
new file mode 100644
index 0000000..66133d8
--- /dev/null
+++ b/tools/versioner/tests/extern_cpp_mismatch/headers/string.h
@@ -0,0 +1,16 @@
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#define __RENAME(x) __asm__(#x)
+
+#if defined(__cplusplus)
+extern "C++" char* basename(char*) __RENAME(__gnu_basename) __INTRODUCED_IN(23);
+extern "C++" const char* basename(const char*) __RENAME(__gnu_basename) __INTRODUCED_IN(23);
+#else
+char* basename(const char*) __RENAME(__gnu_basename) __INTRODUCED_IN(23);
+#endif
+
+#if defined(__cplusplus)
+}
+#endif
diff --git a/tools/versioner/tests/extern_cpp_mismatch/platforms/android-9/arch-arm/symbols/libc.so.functions.txt b/tools/versioner/tests/extern_cpp_mismatch/platforms/android-9/arch-arm/symbols/libc.so.functions.txt
new file mode 100644
index 0000000..257cc56
--- /dev/null
+++ b/tools/versioner/tests/extern_cpp_mismatch/platforms/android-9/arch-arm/symbols/libc.so.functions.txt
@@ -0,0 +1 @@
+foo
diff --git a/tools/versioner/tests/extern_cpp_mismatch/run.sh b/tools/versioner/tests/extern_cpp_mismatch/run.sh
new file mode 100644
index 0000000..a34fda8
--- /dev/null
+++ b/tools/versioner/tests/extern_cpp_mismatch/run.sh
@@ -0,0 +1 @@
+versioner headers -p platforms -r arm -a 9 -i
\ No newline at end of file