Date:	Fri, 23 Mar 2001 13:00:41 +0200
From:	"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender:	halo1 AT zahav DOT net DOT il
To:	djgpp AT delorie DOT com
Message-Id:	<9003-Fri23Mar2001130041+0200-eliz@is.elta.co.il>
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In-reply-to:	<3ABA3BD8.9ECC1B29@nowhere.com> (message from Simon Wood on Thu,
	22 Mar 2001 17:52:24 +0000)
Subject:	Re: help - collect2.exe not linking element from a library
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> From: Simon Wood <simon AT nowhere DOT com>
> Newsgroups: comp.os.msdos.djgpp
> Date: Thu, 22 Mar 2001 17:52:24 +0000
> 
> Thes following describes a problem I am seeing with collect2.exe
> apparently not picking up the fact that a module exists within a
> library.

collect2 doesn't search the libraries at all.  It's the linker that
you have a problem with.

> In the linking process DJGPP runs:
> c:/djgpp/lib/gcc-lib/djgpp/2.952/collect2.exe -o mdemo
> c:/djgpp/lib/crt0.o -Lc:/soft/dev/microwin/src/lib -Lc:/djgpp/lib
> -Lc:/djgpp/lib/gcc-lib/djgpp/2.952 -Lc:/djgpp/bin -Lc:/djgpp/lib -lgrx20
> mdemo.o c:/soft/dev/microwin/src/lib/libmwin.a
> c:/soft/dev/microwin/src/lib/libmwinlib.a
> c:/soft/dev/microwin/src/lib/libmwengine.a
> c:/soft/dev/microwin/src/lib/libmwdrivers.a
> c:/soft/dev/microwin/src/lib/libmwfonts.a
> c:/soft/dev/microwin/src/lib/libmwimages.a -lgrx20 -lgcc -lc -lgcc
> -Tdjgpp.djl c:/soft/dev/microwin/src/lib/libmwinlib.a
> 
> and gives:
> (edit.o)(.text+0x6f6):edit.c: undefined reference to `CreateFont'
> 
> 'CreateFont' is in winfont.o, which is in libmwin.a.
[snip]
> edit.o is in libmwinlib.a
> 
> If I suffix the (long) command with
> 'c:/soft/dev/microwin/src/mwin/winfont.o' (to specify another object to
> add) then it builds and runs.... very strange!!

You forgot that ld.exe is a one-pass linker: it only scans the
libraries once, in the order you specify them in the link command
line.  Thus, by the time it sees a reference to CreateFont in
libmwinlib.a, it has already scanned libmwin.a, and it isn't going to
scan it again.

A solution is to append a second instance of
c:/soft/dev/microwin/src/lib/libmwin.a to the end of your link command
line.  See section 8.10 of the DJGPP FAQ list for more about this and
alternative solutions.

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