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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 2 Nov 2015 15:57:04 +0100
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Subject: Re: [Qemu-devel] [PATCH] configure: disallow ccache during compile
	tests
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To: John Snow <jsnow@redhat.com>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org



On 28/10/2015 18:56, John Snow wrote:
> If the user is using CCACHE during the configuration step,
> it may interfere with some of the configuration tests,
> particularly the "Is CCACHE interfering with macro analysis" step,
> which is a bit of a poetic problem.
> 
> 1) Disallow CCACHE from reading from the cache during configure,
>    but don't disable it to allow us to see if it causes other problems.
> 
> 2) Force off CCACHE_CPP2 during the ccache test to get a deterministic
>    answer over whether or not we need to enable that feature later.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  configure | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/configure b/configure
> index 7a1d08d..9c726eb 100755
> --- a/configure
> +++ b/configure
> @@ -8,6 +8,9 @@
>  CLICOLOR_FORCE= GREP_OPTIONS=
>  unset CLICOLOR_FORCE GREP_OPTIONS
>  
> +# Don't allow CCACHE, if present, to use cached results of compile tests!
> +export CCACHE_RECACHE=yes
> +
>  # Temporary directory used for files created while
>  # configure runs. Since it is in the build directory
>  # we can safely blow away any previous version of it
> @@ -4412,6 +4415,7 @@ fi
>  # check if ccache is interfering with
>  # semantic analysis of macros
>  
> +unset CCACHE_CPP2
>  ccache_cpp2=no
>  cat > $TMPC << EOF
>  static const int Z = 1;
> 

Queued, thanks.