[PATCH] Support OpenCL 1.2 'extern' storage class

[Tom Stellard]

On Wed, Jan 22, 2014 at 04:03:29PM +0000, Fraser Cormack wrote:
> This patch allows clang to compile the "extern" storage class in OpenCL 1.2.
> 
> I've also added a test case for the issue.

Does clang only complain if you use extern with constant address space
variables?  Because it looks like extern is already handled in
DeclSpec::SetStorageClassSpec()

-Tom

> 
> Cheers,
> Fraser
> 
> -- 
> Fraser Cormack
> Compiler Developer
> Codeplay Software Ltd
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> Index: lib/Sema/SemaDecl.cpp
> ===================================================================
> --- lib/Sema/SemaDecl.cpp	(revision 199802)
> +++ lib/Sema/SemaDecl.cpp	(working copy)
> @@ -8541,7 +8541,7 @@
>      // be initialized.
>      if (!Var->isInvalidDecl() &&
>          Var->getType().getAddressSpace() == LangAS::opencl_constant &&
> -        !Var->getInit()) {
> +        Var->getStorageClass() != SC_Extern && !Var->getInit()) {
>        Diag(Var->getLocation(), diag::err_opencl_constant_no_init);
>        Var->setInvalidDecl();
>        return;
> Index: test/SemaOpenCL/extern.cl
> ===================================================================
> --- test/SemaOpenCL/extern.cl	(revision 0)
> +++ test/SemaOpenCL/extern.cl	(working copy)
> @@ -0,0 +1,8 @@
> +// RUN: %clang_cc1 %s -cl-std=CL1.2 -verify -fsyntax-only
> +// expected-no-diagnostics
> +
> +extern constant float foo;
> +
> +kernel void test(global float* buf) {
> +  buf[0] += foo;
> +}

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