[PATCH] Be yet more clever about -Wunused-value in macros

[Matt Beaumont-Gay]

================
Comment at: lib/Sema/SemaStmt.cpp:169
@@ +168,3 @@
+  if (SourceMgr.isMacroBodyExpansion(ExprLoc) &&
+      !(isa<CallExpr>(E->IgnoreParens()) &&
+        E->getLocStart().isMacroID() &&
----------------
Richard Smith wrote:
> The ad-hoc nature of this check gives me pause. I'd be more comfortable saying that __attribute__((warn_unused_result)) always gives a warning, even in a macro body.
What about __attribute__((pure)) or methods declared const?


http://llvm-reviews.chandlerc.com/D380