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improve the diagnostic for uses of the GCC "global variable in a register" extension. 

This implements rdar://6880449 - improve diagnostic for usage of "global register variable" GCC extension

llvm-svn: 71599
This commit is contained in:
Chris Lattner 2009-05-12 21:44:00 +00:00
parent 36312bb5ee
commit d98e7cf7c1
3 changed files with 16 additions and 1 deletions
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2
clang/include/clang/Basic/DiagnosticSemaKinds.td
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@ -1023,6 +1023,8 @@ def warn_tentative_incomplete_array : Warning<
def err_realimag_invalid_type : Error<"invalid type %0 to %1 operator">;
def err_typecheck_sclass_fscope : Error<
"illegal storage class on file-scoped variable">;
def err_unsupported_global_register : Error<
"global register variables are not supported">;
def err_typecheck_sclass_func : Error<"illegal storage class on function">;
def err_static_block_func : Error<
"function declared in block scope cannot have 'static' storage class">;

8
clang/lib/Sema/SemaDecl.cpp
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@ -1742,7 +1742,13 @@ Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
// C99 6.9p2: The storage-class specifiers auto and register shall not
// appear in the declaration specifiers in an external declaration.
if (SC == VarDecl::Auto || SC == VarDecl::Register) {
Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
// If this is a register variable with an asm label specified, then this
// is a GNU extension.
if (SC == VarDecl::Register && D.getAsmLabel())
Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
else
Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
D.setInvalidType();
}
}

7
clang/test/Sema/decl-invalid.c
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@ -20,3 +20,10 @@ const int; // expected-error {{declaration does not declare anything}}
struct; // expected-error {{declaration of anonymous struct must be a definition}} // expected-error {{declaration does not declare anything}}
typedef int I;
I; // expected-error {{declaration does not declare anything}}
// rdar://6880449
register int test1; // expected-error {{illegal storage class on file-scoped variable}}
register int test2 __asm__("edi"); // expected-error {{global register variables are not supported}}