hintonda added a comment.
In D60151#1453099 <https://reviews.llvm.org/D60151#1453099>, @alexfh wrote:
> The change looks fine, but I don't understand the description of this
> revision. Could you clarify which checkers you're talking about and which bug
> you observe?
Sorry for not being clearer in my original description.
The error can be triggered by opening up a new `llvm` namespace under
`clang::tidy` prior to referencing `llvm::SmallSet`, which would happened if a
new llvm checker that gets included in `LLVMTidyModule.cpp` before
`HeaderGuardCheck.h` -- `HeaderGuardCheck.h` includes `HeaderFileExternsions.h`
prior to opening the new `llvm` namespace. Here's the error message you'd get:
llvm-project/clang-tools-extra/clang-tidy/llvm/../utils/../utils/HeaderFileExtensionsUtils.h:24:9:
error: no template named 'SmallSet' in namespace 'clang::tidy::llvm'; did you
mean '::llvm::SmallSet'?
typedef llvm::SmallSet<llvm::StringRef, 5> HeaderFileExtensionsSet;
^~~~~~~~~~~~~~
::llvm::SmallSet
llvm-project/llvm/include/llvm/ADT/SmallSet.h:134:7: note: '::llvm::SmallSet'
declared here
class SmallSet {
^
llvm-project/clang-tools-extra/clang-tidy/llvm/../utils/../utils/HeaderFileExtensionsUtils.h:24:30:
error: no member named 'StringRef' in namespace 'clang::tidy::llvm'
typedef llvm::SmallSet<llvm::StringRef, 5> HeaderFileExtensionsSet;
~~~~~~^
2 errors generated.
Here's the one line contrived change needed to demonstrate the error produced
above, which is the same effect of including an `llvm` checker header before
including this file:
--- a/clang-tools-extra/clang-tidy/utils/HeaderFileExtensionsUtils.h
+++ b/clang-tools-extra/clang-tidy/utils/HeaderFileExtensionsUtils.h
@@ -16,6 +16,7 @@
namespace clang {
namespace tidy {
+namespace llvm {}
namespace utils {
typedef llvm::SmallSet<llvm::StringRef, 5> HeaderFileExtensionsSet;
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D60151/new/
https://reviews.llvm.org/D60151
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