From 9a2120a6e1fcefbfabbe8d25f14e056fadc37f2d Mon Sep 17 00:00:00 2001
From: Wenlei He <aktoon@gmail.com>
Date: Sun, 2 Jan 2022 16:25:27 -0800
Subject: [PATCH] [llvm-profgen] Error out for unsupported AutoFDO profile
 generate with probe

Error out instead of siliently generate empty profile when trying to generate AutoFDO profile with probe binary.

Differential Revision: https://reviews.llvm.org/D116508
---
 llvm/tools/llvm-profgen/ProfileGenerator.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/tools/llvm-profgen/ProfileGenerator.cpp b/llvm/tools/llvm-profgen/ProfileGenerator.cpp
index f03e407dbe7d..7155ec4a4219 100644
--- a/llvm/tools/llvm-profgen/ProfileGenerator.cpp
+++ b/llvm/tools/llvm-profgen/ProfileGenerator.cpp
@@ -383,6 +383,8 @@ ProfileGenerator::getTopLevelFunctionProfile(StringRef FuncName) {
 void ProfileGenerator::generateProfile() {
   if (Binary->usePseudoProbes()) {
     // TODO: Support probe based profile generation
+    exitWithError("Probe based profile generation not supported for AutoFDO, "
+      "consider dropping `--ignore-stack-samples` or adding `--use-dwarf-correlation`.");
   } else {
     generateLineNumBasedProfile();
   }