[clang] [Clang] diagnosing missing Vulkan environment when using SPIR-V triple (PR #190840)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,4 @@
+// RUN: not %clang -target spirv %s 2>&1 | FileCheck %s
----------------
AaronBallman wrote:

https://fabiensanglard.net/dc/driver.php also has some pretty reasonable detail on what cc1 is and why it exists.

https://github.com/llvm/llvm-project/pull/190840