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Date: Fri, 03 Feb 2012 16:22:34 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] [PATCH] Only export required CFLAGS via
	xeno-config
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To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

On 02/03/2012 03:50 PM, Jan Kiszka wrote:
> -Werror-implicit-function-declaration is not compatible with C++, and
> also decisions about -Wall and -pipe should be left to the application.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@domain.hid>
> ---
>  configure.in |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/configure.in b/configure.in
> index b2563ee..2185925 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -448,13 +448,13 @@ else
>  fi
>  AC_MSG_RESULT([done])
>  
> -dnl Common CFLAGS and LDFLAGS
> -XENO_USER_CFLAGS="-D_GNU_SOURCE -D_REENTRANT -Wall -Werror-implicit-function-declaration -pipe"
> -XENO_USER_LDFLAGS=
> +dnl Exported CFLAGS and LDFLAGS, shared with internal flags
> +XENO_USER_APP_CFLAGS="-D_GNU_SOURCE -D_REENTRANT"
> +XENO_USER_APP_LDFLAGS=
>  
> -dnl Exported CFLAGS and LDFLAGS, may be enhanced per-arch below
> -XENO_USER_APP_CFLAGS=$XENO_USER_CFLAGS
> -XENO_USER_APP_LDFLAGS=$XENO_USER_LDFLAGS
> +dnl Internal CFLAGS and LDFLAGS, may be enhanced per-arch below
> +XENO_USER_CFLAGS="$XENO_USER_CFLAGS -Wall -Werror-implicit-function-declaration -pipe"
> +XENO_USER_LDFLAGS="$XENO_USER_APP_LDFLAGS"

We do not build C++ code, so I see no problem with using flags
incompatible with C++, and customize the flags according to our
preferences. Now, the flags returned by xeno-config are another issue,
if this is what you want to change, please do not change the flags used
to compile xenomai globally.

-- 
					    Gilles.