[llvm] Print more descriptive error message when trying to link a global with appending linkage (PR #69613)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Gleb Popov (arrowd)

<details>
<summary>Changes</summary>

This is a proper fix for https://github.com/llvm/llvm-project/issues/40308

---
Full diff: https://github.com/llvm/llvm-project/pull/69613.diff


2 Files Affected:

- (modified) llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp (+1-1) 
- (modified) llvm/test/CodeGen/X86/AppendingLinkage.ll (+1-1) 


``````````diff
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 072c55f79caa9dc..dab02272fadf9b9 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -2746,7 +2746,7 @@ bool AsmPrinter::emitSpecialLLVMGlobal(const GlobalVariable *GV) {
     return true;
   }
 
-  report_fatal_error("unknown special variable");
+  report_fatal_error("unknown special variable with appending linkage");
 }
 
 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
diff --git a/llvm/test/CodeGen/X86/AppendingLinkage.ll b/llvm/test/CodeGen/X86/AppendingLinkage.ll
index 83bfbe85240afb1..ace5d192b7ea7ee 100644
--- a/llvm/test/CodeGen/X86/AppendingLinkage.ll
+++ b/llvm/test/CodeGen/X86/AppendingLinkage.ll
@@ -1,4 +1,4 @@
 ; RUN: not --crash llc < %s -mtriple=i686-- 2>&1 | FileCheck %s
 
-; CHECK: unknown special variable
+; CHECK: unknown special variable with appending linkage
 @foo = appending constant [1 x i32 ]zeroinitializer

``````````

</details>


https://github.com/llvm/llvm-project/pull/69613