Re: [Xen-devel] [Qemu-devel] [PATCH] qemu/configure: fix CFLAGS handling for i386

[Andreas FÃrber <afaerber@xxxxxxx>]

Hi Olaf,

Am 30.03.2012 17:24, schrieb Olaf Hering:
> 
> configure will generate incorrect CFLAGS which will lead to compile
> errors due to unknown gcc options, IFF CFLAGS was already in the
> environment during configure invocation.
> 
> Add a space before the -march=i486 gcc option.
> 
> This patch is against the qemu-xen tree, but it should apply also to
> qemu.git since it has the same issue. Please apply to both trees.
> 
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

The patch applies fine to upstream QEMU (we should strip leading qemu/
from the commit message though).

This is the only usage of += outside Makefile fragments, so I wonder if
its use may have been by accident. Is it safe in a POSIX context?
Or should we better use CFLAGS="$CFLAGS -march=486"?
For QEMU_CFLAGS we use the pattern QEMU_CFLAGS="-options $QEMU_CFLAGS"
to allow overriding options.

Andreas

> 
> ---
>  configure |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: qemu-xen-dir-remote/configure
> ===================================================================
> --- qemu-xen-dir-remote.orig/configure
> +++ qemu-xen-dir-remote/configure
> @@ -2637,7 +2637,7 @@ int main(int argc, char **argv)
>  }
>  EOF
>    if ! compile_prog "" "" ; then
> -    CFLAGS+="-march=i486"
> +    CFLAGS+=" -march=i486"
>    fi
>  fi
>  

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