Re: Unresolved references to opendir/readdir/closedir

[Christopher Faylor <cgf at redhat dot com>]

On Mon, Mar 05, 2001 at 02:44:46PM -0700, Lyman Neuschaefer wrote:
>Further elaboration on my problem,
>
>Thanks for your reply.  I've tried what you said, but
>am still having problems...
>
>After reinstalling cygwin 1.1.8 on
>Win NT SP5 I have found definitions
>for opendir/readdir/closedir within /lib/libc.a:
>
> /lib:54>nm -C libc.a |egrep '(opendir|readdir|closedir)'
> 00000000 I _imp__readdir
> 00000000 T readdir
> 00000000 I _imp__opendir
> 00000000 T opendir
> 00000000 I _imp__closedir
> 00000000 T closedir
> 00000000 I _imp___readdir
> 00000000 T _readdir
> 00000000 I _imp___opendir
> 00000000 T _opendir
> 00000000 T _closedir
> 00000000 I _imp___closedir
>
>However, these symbols are still unresolved when linking
>an executable as observed below:
>
> g++  -o svintf SVIntf.o cnf.a \
> ../message/message.a \
> ../viewers/table.a \
> ../common/common.a \
> ../../../tools/bcgui/bcgui.a \
> ../../../tools/support/support.a \
> -L/usr/local/LessTif/Motif2.0/lib -L/usr/X11R6/lib -L/lib -lc -lXm -lXt -lS
>M -lICE -lX11
> cnf.a(SVIntfLoader.o)(.text+0x2942):SVIntfLoader.C: undefined reference to
>`opendir(char const *)'
> cnf.a(SVIntfLoader.o)(.text+0x2a7b):SVIntfLoader.C: undefined reference to
>`readdir(DIR *)'
> cnf.a(SVIntfLoader.o)(.text+0x2c43):SVIntfLoader.C: undefined reference to
>`closedir(DIR *)'
> cnf.a(SVIntfLoader.o)(.text+0x2ce4):SVIntfLoader.C: undefined reference to
>`opendir(char const *)'
> cnf.a(SVIntfLoader.o)(.text+0x2e3b):SVIntfLoader.C: undefined reference to
>`readdir(DIR *)'
> cnf.a(SVIntfLoader.o)(.text+0x3107):SVIntfLoader.C: undefined reference to
>`closedir(DIR *)'
> collect2: ld returned 1 exit status
>
>Notice the explicit inclusion of /lib/libc.a (-L/lib -lc).  I am tearing my
>hair out on this one.  Thanks for any help you can provide.

1) Don't explicitly include -lc.  There is no reason to do this and it could
   conceivably cause problems.

2) Do explicitly include the include file where these functions are
   declared.  As you can see from the 'nm' above, imported versions of
   functions are referenced by prepending __imp_ to the function names.
   Unless you declare the functions correctly, your program won't properly
   link these.  If you don't know, use grep to find the header file
   where the functions are declared.

cgf

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