[OpenWrt-Devel] [PATCH] openwrt/hardening: Fix CFLAGS usage for -D_FORTIFY_SOURCE

Karl Palsson karlp at tweak.net.au
Tue Sep 8 11:59:27 EDT 2015


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Helmut Schaa <helmut.schaa at googlemail.com> wrote:
> On Tue, Sep 8, 2015 at 9:03 AM, Stefan Peter <st3fanp3t3r at gmail.com>
> wrote:
> > Hi
> > Am 07.09.2015 um 17:32 schrieb Helmut Schaa:
> >> Fix the following configure error with c-ares by using CPPFLAGS for -D_FORTIFY_SOURCE.
> >> Not sure if any other packages suffer from the same issue.
> >>
> >> configure: using CFLAGS: -Os -pipe -march=74kc -fno-caller-saves -mno-branch-likely -g3 -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro
> >> configure: CFLAGS error: CFLAGS may only be used to specify C compiler flags, not macro definitions. Use CPPFLAGS for: -D_FORTIFY_SOURCE=1
> >> configure: error: Can not continue. Fix errors mentioned immediately above this line.
> >
> > Did you get this in the CC branch?
> >
> > According to
> > https://github.com/openwrt/packages/pull/1464
> > this should be fixed in master and applying this patch on top of the CC
> > branch worked for me.
> 
> I came up with a similar patch now :) but good to know it's fixed in
> master already.
> Helmut

Also, I took it up with c-ares, they largely feel that we're "wrong" but
agreed that they could probably relax their check from an error to a
warning: http://c-ares.haxx.se/mail/c-ares-archive-2015-06/0005.shtml

However, that's "in the future"

Cheers,
Karl P

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