linux-kernel - Re: [PATCH] tools build: Fix clang detection with clang >= 8.0

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Date:   Wed, 14 Aug 2019 13:47:16 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Matthew Dawson <matthew@...systems.ca>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] tools build: Fix clang detection with clang >= 8.0

On Mon, Aug 12, 2019 at 10:07 PM Matthew Dawson <matthew@...systems.ca> wrote:
>
> The 8.0 release of clang/llvm moved the VirtualFileSystem.h header
> to from clang to llvm.  This change causes a compile error, causing
> perf to not detect clang/llvm.
>
> Fix by including the right header for the different versions of llvm,
> using the older header for llvm < 8, and the new header for llvm >= 8.
>
> Signed-off-by: Matthew Dawson <matthew@...systems.ca>

Specifically the header was moved in svn revision r344140.
llvmorg-8.0.0 was tagged off of r356365, while llvmorg-7.0.0 is tagged
off of r342383.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  tools/build/feature/test-clang.cpp | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/tools/build/feature/test-clang.cpp b/tools/build/feature/test-clang.cpp
> index a2b3f092d2f0..313ef1568880 100644
> --- a/tools/build/feature/test-clang.cpp
> +++ b/tools/build/feature/test-clang.cpp
> @@ -1,10 +1,14 @@
>  // SPDX-License-Identifier: GPL-2.0
> -#include "clang/Basic/VirtualFileSystem.h"
>  #include "clang/Driver/Driver.h"
>  #include "clang/Frontend/TextDiagnosticPrinter.h"
>  #include "llvm/ADT/IntrusiveRefCntPtr.h"
>  #include "llvm/Support/ManagedStatic.h"
>  #include "llvm/Support/raw_ostream.h"
> +#if LLVM_VERSION_MAJOR >= 8
> +#include "llvm/Support/VirtualFileSystem.h"
> +#else
> +#include "clang/Basic/VirtualFileSystem.h"
> +#endif

-- 
Thanks,
~Nick Desaulniers