[clang] c049732 - [clang] Fix crash when diagnosing unsupported attributes (#150333)

[via cfe-commits]

Author: Benjamin Maxwell
Date: 2025-07-24T09:42:05+01:00
New Revision: c049732d7f946492ec3f6f5e7c3b845b7133fca8

URL: https://github.com/llvm/llvm-project/commit/c049732d7f946492ec3f6f5e7c3b845b7133fca8
DIFF: https://github.com/llvm/llvm-project/commit/c049732d7f946492ec3f6f5e7c3b845b7133fca8.diff

LOG: [clang] Fix crash when diagnosing unsupported attributes (#150333)

In #141305, the attribute argument was (unintentionally) removed from
the diagnostic emission.

Fixes #150237

Added: 
    clang/test/Sema/unsupported-arm-streaming.cpp

Modified: 
    clang/lib/Sema/SemaDeclAttr.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 59f89b192ba68..a4e8de49a4229 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -2041,7 +2041,8 @@ bool Sema::CheckAttrTarget(const ParsedAttr &AL) {
   // Check whether the attribute is valid on the current target.
   if (!AL.existsInTarget(Context.getTargetInfo())) {
     if (AL.isRegularKeywordAttribute())
-      Diag(AL.getLoc(), diag::err_keyword_not_supported_on_target);
+      Diag(AL.getLoc(), diag::err_keyword_not_supported_on_target)
+          << AL << AL.getRange();
     else
       DiagnoseUnknownAttribute(AL);
     AL.setInvalid();

diff  --git a/clang/test/Sema/unsupported-arm-streaming.cpp b/clang/test/Sema/unsupported-arm-streaming.cpp
new file mode 100644
index 0000000000000..8693dd6875d50
--- /dev/null
+++ b/clang/test/Sema/unsupported-arm-streaming.cpp
@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 -x c -triple x86_64-pc-linux-gnu -fsyntax-only -verify %s
+
+void arm_streaming(void) __arm_streaming {} // expected-error {{'__arm_streaming' is not supported on this target}}