linux-kernel - Re: [PATCH] zlib: Put get_unaligned16() inside #ifdef block

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Date:   Mon, 22 May 2017 14:39:25 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zlib: Put get_unaligned16() inside #ifdef block

On Mon, 22 May 2017 14:13:26 -0700 Matthias Kaehlcke <mka@...omium.org> wrote:

> The function is not used when CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y.
> Adding the #ifdef fixes the following warning when building with clang:
> 
> lib/zlib_inflate/inffast.c:31:1: error: unused function 'get_unaligned16'
>     [-Werror,-Wunused-function]
> 
> ...
>
> --- a/lib/zlib_inflate/inffast.c
> +++ b/lib/zlib_inflate/inffast.c
> @@ -26,6 +26,7 @@ union uu {
>  	unsigned char b[2];
>  };
>  
> +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
>  /* Endian independed version */
>  static inline unsigned short
>  get_unaligned16(const unsigned short *p)
> @@ -37,6 +38,7 @@ get_unaligned16(const unsigned short *p)
>  	mm.b[1] = b[1];
>  	return mm.us;
>  }
> +#endif
>  
>  #ifdef POSTINC
>  #  define OFF 0

Do we really want to mucky up the source code to keep clang happy?  gcc
won't warn about an unused static inline.  Can we configure clang to do
the same?