Re: [Qemu-devel] [RISU PATCH 06/10] configure: support CPPFLAGS

[Dave Martin]

On Tue, Nov 07, 2017 at 03:05:54PM +0000, Alex Bennée wrote:
> Useful for accessing API's that are still brewing, e.g:
> 
>   CROSS_PREFIX=aarch64-linux-gnu- \
>     CPPFLAGS=-I/home/alex/lsrc/qemu/risu.git/sve-headers/include \
>     ../configure
> 
> Signed-off-by: Alex Bennée <address@hidden>
> ---
>  README    | 6 ++++++
>  configure | 1 +
>  2 files changed, 7 insertions(+)
> 
> diff --git a/README b/README
> index 9946e6e..fbe408d 100644
> --- a/README
> +++ b/README
> @@ -26,6 +26,12 @@ Most useful is
>     need this if you're not building on the target system
>     (Example: CROSS_PREFIX=arm-linux-gnueabihf- )
>  
> +Another useful flag is
> + CPPFLAGS= which specified pre-processor flags, usually -I statements
> +   for specifying extra include paths. Use this is you need something

s/is/if/

> +   from new kernel headers not installed on your system.
> +   (Example: CPPFLAGS=-I/path/to/sve-kernel-headers/include)
> +

You should probably point out that the path should refer to headers
installed by running 'make headers_install' in the Linux source.  This
means we really test the uapi headers properly, and I don't get spurious
bug reports about bad headers ;)

[...]

Cheers
---Dave