Precommit

Author: badumbatish

clang/test/CodeGen/WebAssembly/musttail.c

@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -target-feature +tail-call -o /dev/null -emit-llvm -verify=good
+// RUN: %clang_cc1 %s -triple wasm64-unknown-unknown -target-feature +tail-call -o /dev/null -emit-llvm -verify=good
+// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -o /dev/null -emit-llvm -verify=notail
+
+int foo(int x) {
+  return x;
+}
+
+#if __has_attribute(musttail)
+// good-warning@+2 {{HAS IT}}
+// notail-warning@+1 {{HAS IT}}
+#warning HAS IT
+#else
+#warning DOES NOT HAVE
+#endif
+
+int bar(int x)
+{
+ [[clang::musttail]] return foo(1);
+}