netdev - Re: [PATCH iproute2 1/2] ss: Fix compiler errors of unused return-values

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Date:	Mon, 22 Jul 2013 07:54:10 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 1/2] ss: Fix compiler errors of unused
 return-values

On Sat, 20 Jul 2013 21:58:17 +0200
Christoph Paasch <christoph.paasch@...ouvain.be> wrote:

> Many errors when compiling with gcc 4.7.3 about unused return-values
> upon the calls to fgets and fscanf:
> 
> ss.c: In function ‘user_ent_hash_build’:
> ss.c:305:12: error: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘get_slabstat’:
> ss.c:387:7: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘init_service_resolver’:
> ss.c:511:8: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘run_ssfilter’:
> ss.c:728:11: error: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘is_ephemeral’:
> ss.c:550:10: error: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘netlink_show’:
> ss.c:2836:7: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘packet_show’:
> ss.c:2630:7: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Werror=unused-result]
> ss.c: In function ‘unix_show’:
> ss.c:2364:7: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Werror=unused-result]
> cc1: all warnings being treated as errors
> make[1]: *** [ss.o] Error 1
> make[1]: Leaving directory `/home/christoph/workspace/linux/iproute2/misc'
> make: *** [all] Error 2
> 
> For the calls to fscanf we can't really do anything about it, and just
> do an empty if-statement to make the compiler happy.
> 
>

I would prefer an error message rather than silently exiting.
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