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Message-ID: <1438902142.30467.23.camel@linuxfoundation.org>
From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Andre McCurdy <armccurdy@gmail.com>
Date: Thu, 06 Aug 2015 18:02:22 -0500
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Subject: Re: [PATCH 3/3] uclibc.inc: avoid immediate expansion for UCLIBC_EXTRA_CFLAGS
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On Thu, 2015-08-06 at 12:41 -0700, Andre McCurdy wrote:
> If immediate variable expansion is used, then UCLIBC_EXTRA_CFLAGS can
> sometimes be derived from a partially expanded value of CFLAGS.
> 
> One specific problem case occurs when security_flags.inc is used: CFLAGS
> is evaluated before the SECURITY_CFLAGS_pn-uclibc over-ride has been
> applied and therefore UCLIBC_EXTRA_CFLAGS ends up being based on the
> default SECURITY_CFLAGS instead of the uclibc specific value.
> 
> Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
> ---
>  meta/recipes-core/uclibc/uclibc.inc | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/meta/recipes-core/uclibc/uclibc.inc b/meta/recipes-core/uclibc/uclibc.inc
> index c483228..3ed8b60 100644
> --- a/meta/recipes-core/uclibc/uclibc.inc
> +++ b/meta/recipes-core/uclibc/uclibc.inc
> @@ -57,8 +57,8 @@ export V="2"
>  # -O<n> -fno-omit-frame-pointer ends up with GCC ICE on thumb as reported
>  # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44860
>  #
> -CFLAGS_arm := "${@oe_filter_out('-fno-omit-frame-pointer', '${CFLAGS}', d)}"
> -UCLIBC_EXTRA_CFLAGS  := "${@oe_filter_out('(-I\S+|-i\S+)', '${CFLAGS}', d)}"
> +CFLAGS_arm = "${@oe_filter_out('-fno-omit-frame-pointer', '${CFLAGS}', d)}"

I'm rather surprised we don't get circular references without the :=
operator with this. I suspect we can see build failures if you change
the code like this. That said, I've been meaning to go through and
replace all the uses of oe_filter_out with the remove operator. Can we
do that here please instead?

E.g:
CFLAGS_remove_arm = "-fno-omit-frame-pointer"

> +UCLIBC_EXTRA_CFLAGS = "${@oe_filter_out('(-I\S+|-i\S+)', '${CFLAGS}', d)}"

Cheers,

Richard