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Date: Wed, 16 Jan 2013 12:00:15 +0100
From: Patrick Lamaiziere <patfbsd@davenulle.org>
To: "Thomas D. Dean" <tomdean@speakeasy.org>
Subject: Re: time_t definition
Message-ID: <20130116120015.3b8d0db4@mr129166>
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Le Tue, 15 Jan 2013 10:35:53 -0800,
"Thomas D. Dean" <tomdean@speakeasy.org> a écrit :

Hello,

> I am attempting to recompile some code from an older version.
> 
>  > uname -a
> FreeBSD ZD7000 9.1-STABLE FreeBSD 9.1-STABLE #1: Sun Jan 13 23:44:33
> PST 2013     root@ZD7000:/usr/obj/usr/src/sys/GENERIC  i386
> 
>  > make
> gcc47 -O2 -pipe  -I../../include -std=gnu99 -fstack-protector 
> -Wsystem-headers -Werror -Wall -Wno-format-y2k -Wno-uninitialized 
> -Wno-pointer-sign -c data-collection.c
> data-collection.c: In function 'main':
> data-collection.c:214:4: error: format '%ld' expects argument of type 
> 'long int', but argument 3 has type 'time_t' [-Werror=format]
> data-collection.c:234:4: error: format '%ld' expects argument of type 
> 'long int', but argument 3 has type 'time_t' [-Werror=format]
> cc1: all warnings being treated as errors
> *** [data-collection.o] Error code 1
> 
> 
>  > cat data-collection.c
> ...
> #include <time.h>            /* time_t */
> #include <sys/time.h>        /* gettimeofday() */
> ...
>          gettimeofday(&spi_stop, &tz); /     * line 211 */
>            printf("Loop %d, SPI  %ld %ld\n",
>                   loop,
>                   spi_stop.tv_sec, spi_stop.tv_usec);
> ...
>            gettimeofday(&disk_stop, &tz);    /* line 231 */
>            printf("Loop %d, Disk %ld %ld\n",
>                   loop,
>                   disk_stop.tv_sec, disk_stop.tv_usec);
> ...
> 
> time.h defines time_t
> 
> #ifndef _TIME_T_DECLARED
> typedef __time_t        time_t;
> #define _TIME_T_DECLARED
> #endif
> 
> sys/time.h includes sys/types.h which includes sys/_types.h which 
> includes machine/_types.h where __time_t is defined
> 
> typedef __int32_t       __time_t;               /* time()... */
> 
> Question:  Why do I see the error?

Looks like gcc47 checks the printf format string (-Wformat)
Disable this check or convert your time_t.

Regards.