Hello.
With reference to this message
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2010-August/010509.html
here is a patch demoting the error into an extension warning.
OK to commit?
Index: test/Sema/pointer-addition.c
===================================================================
--- test/Sema/pointer-addition.c (revision 113725)
+++ test/Sema/pointer-addition.c (working copy)
@@ -9,6 +9,7 @@
c += 1; // expected-warning {{use of GNU void* extension}}
c--; // expected-warning {{use of GNU void* extension}}
c -= 1; // expected-warning {{use of GNU void* extension}}
+ (void) c[1]; // expected-warning {{use of GNU void* extension}}
b = 1+b; // expected-error {{arithmetic on pointer to incomplete type}}
/* The next couple tests are only pedantic warnings in gcc */
void (*d)(S*,void*) = a;
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp (revision 113725)
+++ lib/Sema/SemaExpr.cpp (working copy)
@@ -2418,7 +2418,11 @@
return ExprError();
}
- if (!ResultType->isDependentType() &&
+ if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
+ // GNU extension: subscripting on pointer to void
+ Diag(LLoc, diag::ext_gnu_void_ptr)
+ << BaseExpr->getSourceRange();
+ } else if (!ResultType->isDependentType() &&
RequireCompleteType(LLoc, ResultType,
PDiag(diag::err_subscript_incomplete_type)
<< BaseExpr->getSourceRange()))
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