linux-kernel - Re: [PATCH] Scripts: kconfig: nconf: fix _GNU

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Message-ID: <1480364961.1959.9.camel@tiscali.nl>
Date:   Mon, 28 Nov 2016 21:29:21 +0100
From:   Paul Bolle <pebolle@...cali.nl>
To:     Cheah Kok Cheong <thrust73@...il.com>,
        Michal Marek <mmarek@...e.cz>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Scripts: kconfig: nconf: fix _GNU_SOURCE redefined
 warning

[Dropped Yann.]

On Tue, 2016-11-29 at 02:46 +0800, Cheah Kok Cheong wrote:
> On Mon, Nov 28, 2016 at 11:39:01AM +0100, Michal Marek wrote:
> > The Makefile does not specify -D_GNU_SOURCE. Are you adding it manually?

On Fedora 24 I'm able to trigger this too:
    $ [...]
    make -f ./scripts/Makefile.build obj=scripts/kconfig nconfig
      gcc -Wp,-MD,scripts/kconfig/.nconf.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89   -D_GNU_SOURCE -DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1 -DLOCALE   -c -o scripts/kconfig/nconf.o scripts/kconfig/nconf.c
    scripts/kconfig/nconf.c:8:0: warning: "_GNU_SOURCE" redefined
     #define _GNU_SOURCE
     
    <command-line>:0:0: note: this is the location of the previous definition

It's probably added by pkg-config:
    $ pkg-config --cflags ncursesw
    -D_GNU_SOURCE

And apparently we call pkg-config in scripts/kconfig/Makefile. Or in
scripts/kconfig/lxdialog/check-lxdialog.sh. Not sure, I didn't yet dive deeper
into this.

Hope this helps,


Paul Bolle