Why does #include <cyg/io/eth/eth_drv> define a bunch of time-related symbols?

[Grant Edwards <grant dot b dot edwards at gmail dot com>]

I'm working on a new Ethernet driver.  eCos kernel/libs (including the
new drive) build fine. But, when I try to link an application I get a
bunch of errors because some time-related functions are defined twice.
They're defined in libtarget where they're supposed to be, but they're
also getting defined in the object file for my Ethernet driver [and I
can't figure out why].

However, my ethernet driver file has been stripped down to nothing but
a handful of #include directives:

------------------------------lpc1800_ether.c------------------------------
#include <pkgconf/system.h>
#include <cyg/infra/diag.h>
#include <cyg/io/eth/netdev.h>
#include <cyg/io/eth/eth_drv.h>
---------------------------------------------------------------------------

If I comment out the last line (eth_drv.h), the problem goes away (the
object file is empty).  With that line, I get the duplicate time
functions showing up in what should be an empty object file.  

Why?


Here's some info on the object file that's generated with eth_drv.h
included:

$ size [...]/current/src/devs_eth_arm_lpc1800_lpc1800_ether.o
   text    data     bss     dec     hex filename
   1740       0       0    1740     6cc [...]/current/src/devs_eth_arm_lpc1800_lpc1800_ether.o

$ nm -a [...]/current/src/devs_eth_arm_lpc1800_lpc1800_ether.o
00000000 t $a
[...]
00000000 N .debug_ranges
00000000 N .debug_str
00000000 t .text
00000000 t .text.asctime
00000000 t .text.asctime_r
00000000 t .text.ctime
00000000 t .text.ctime_r
00000000 t .text.cyg_libc_time_getzoneoffsets
00000000 t .text.cyg_libc_time_setdst
00000000 t .text.cyg_libc_time_setzoneoffsets
00000000 t .text.difftime
00000000 t .text.gmtime
00000000 t .text.localtime
00000000 t .text.localtime_r
00000000 t .text.strcoll
         U __aeabi_i2d
00000000 T asctime
00000000 T asctime_r
00000000 T ctime
00000000 T ctime_r
         U cyg_libc_time_asctime_buf
         U cyg_libc_time_current_dst_offset
         U cyg_libc_time_current_dst_stat
         U cyg_libc_time_current_std_offset
         U cyg_libc_time_day_name
00000000 T cyg_libc_time_getzoneoffsets
         U cyg_libc_time_gmtime_buf
         U cyg_libc_time_itoa
         U cyg_libc_time_localtime_buf
         U cyg_libc_time_month_name
         U cyg_libc_time_normalize_structtm
00000000 T cyg_libc_time_setdst
00000000 T cyg_libc_time_setzoneoffsets
00000000 T difftime
00000000 T gmtime
         U gmtime_r
00000000 T localtime
00000000 T localtime_r
00000000 a lpc1800_ether.c
         U memcpy
         U strcmp
00000000 T strcoll


-- 
Grant Edwards               grant.b.edwards        Yow! I'm a fuschia bowling
                                  at               ball somewhere in Brittany
                              gmail.com            


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss