Re: [U-Boot] getline prototype issue

On 07/30/2013 02:17 PM, Simon Glass wrote:

Hi York,

On Tue, Jul 30, 2013 at 3:12 PM, York Sun <yorksun@freescale.com mailto:yorksun@freescale.com> wrote:

Simon,

Your patch

commit 669dfc2ed8d853d6bcdcafa1de6aca22929465e5
Author: Simon Glass <sjg@chromium.org <mailto:sjg@chromium.org>>
Date:   Mon Mar 11 06:30:27 2013 +0000

    fdt: Ensure that libfdt_env.h comes from U-Boot

adds libfdt_env.h to HOSTCPPFLAGS. The causes a problem with one of our
older hosts. On the old hosts, getline prototype is protected by

#ifdef __USE_GNU

This should be OK if the C file has #define _GNU_SOURCE. However,
because of your patch, the stdio.h is included before _GNU_SOURCE is
defined. The result is warnings like this

aisimage.c: In function ‘aisimage_generate’:
aisimage.c:313: warning: implicit declaration of function ‘getline’
kwbimage.c: In function ‘kwdimage_set_ext_header’:
kwbimage.c:236: warning: implicit declaration of function ‘getline’
imximage.c: In function ‘parse_cfg_file’:
imximage.c:430: warning: implicit declaration of function ‘getline’
pblimage.c: In function ‘pbl_parser’:
pblimage.c:137: warning: implicit declaration of function ‘getline’
ublimage.c: In function ‘parse_cfg_file’:
ublimage.c:179: warning: implicit declaration of function ‘getline’

I took a quick look at this. It seems that many of the host C files in tools/ define _GNU_SOURCE. Should we just move that #define to the Makefile?

Adding -D_GNU_SOURCE in Makefile can fix this problem.

York