[cfe-commits] [cfe-dev] Fixits for invalid main declarations

Douglas Gregor dgregor at apple.com
Wed Sep 7 16:19:56 PDT 2011

On Sep 4, 2011, at 2:48 PM, David Blaikie wrote:

> Here's a patch to add FixIt diagnostics to the "main cannot/should not be static" and "main cannot be inline" warnings/errors.
> Some context from a previous email conversation with Douglas Gregor:
> No, main cannot be a template.
> Seems the error for templated main was coming from the ActOnFunctionDeclarator use case anyway - by the time we got to template instantiation we'd already diagnosed this problem so it was just redundant to check there.
>> So should we just push the isMain/checkMain checking up into ActOnFunctionDeclarator instead? Then it wouldn't add any overhead to irrelevant contexts (methods & templates) & the checking could be more descriptive.
> Works for me!
> So I've done that - pulling out the first few checks from CheckFunctionDeclaration into the two call sites in ActOnFunctionDeclarator & then passing the DeclSpec to the CheckMain calls. I could refactor that common "IsMain/CheckMain/CheckFunctionDeclarator" into one function to use from these two (non-C++ and C++) call sites in ActOnFunctionDeclarator if you think that'd be better.
> I also split up the static/inline warnings so they could warn against the keyword rather than against the 'main' (when warning against the 'main' and issuing a fixit for 'static' on a different line (or inside a macro), the diagnostic just printed out without the fixit) - this seemed consistent with other cases relating to spurious static in SemaDecl.cpp (some other cases include the fixit, some don't - I'll see about making some patches for those other missing fixits too).

+    Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus ? diag::err_static_main : diag::warn_static_main) << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
+  if (FD->isInlineSpecified())
+    Diag(DS.getInlineSpecLoc(), diag::err_inline_main) << FixItHint::CreateRemoval(DS.getInlineSpecLoc());

Please limit code to 80 columns. Otherwise, looks good! If you don't have commit access already, please follow the directions at


so you can commit this yourself.

> After this I'll just keep working my way down through CheckMain to add fixits to each of the suggestions where they're applicable.


	- Doug

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