[cfe-commits] r117184 - in /cfe/trunk: include/clang/Basic/DiagnosticSemaKinds.td lib/Sema/SemaAttr.cpp lib/Sema/SemaExpr.cpp test/Analysis/rdar-6442306-1.m test/Sema/attr-unused.c test/Sema/pragma-unused.c

John McCall rjmccall at apple.com
Sat Oct 23 21:11:21 PDT 2010

On Oct 22, 2010, at 4:37 PM, Anders Carlsson wrote:
> Author: andersca
> Date: Fri Oct 22 18:37:08 2010
> New Revision: 117184
> URL: http://llvm.org/viewvc/llvm-project?rev=117184&view=rev
> Log:
> Warn if a variable marked with the "unused" attribute is used. Patch by Darin Adler!

Er.  Traditionally this attribute is put on declarations to white-list them for -Wunused;  i.e. to say that it's okay if they aren't used, not to say that it's not okay if they are used.  This breaks a *lot* of expected, perfectly idiomatic uses of __attribute__((unused)).  Furthermore, AFAICT __attribute__((unavailable)) already captures the desired semantics, at least for (ahem) projects that always build with -Werror.

Please revert this or at least take it out of -Wunused.


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