[clang] [llvm] [Clang] Add env var for nvptx-arch/amdgpu-arch timeout (PR #102521)

[Joseph Huber via cfe-commits]

================
@@ -116,6 +117,15 @@ ToolChain::executeToolChainProgram(StringRef Executable,
   };
 
   std::string ErrorMessage;
+  int SecondsToWait = DefaultSecondsToWait;
+  if (std::optional<std::string> Str =
+          llvm::sys::Process::GetEnv("CLANG_TOOL_CHAIN_PROGRAM_WAIT")) {
+    int Val = std::atoi(Str->c_str());
+    if (Val > 0)
+      SecondsToWait = Val;
+    else
+      SecondsToWait = 0; // infinite
----------------
jhuber6 wrote:

We should probably make sure the value is an integer.
```suggestion
if (!llvm::to_integer(Arg->getValue(), Val))
  return createStringError("CLANG_TOOLCHAIN_PROGRAM_TIMEOUT expected an integer, got '%s'", *Str);
Val = std::max(Val, 0);
```

https://github.com/llvm/llvm-project/pull/102521