Subj : Re: Linking problems
To   : netscape.public.mozilla.jseng
From : Matthew Mondor
Date : Tue Jul 19 2005 02:57 pm

On Mon, 18 Jul 2005 23:32:08 -0700
Jeremy Gillick <jg@mozmonkey.com> wrote:

> When I try to compile a simple demo program (see attached) on my apple 
> powerbook, I get the following error:
> 
>     ld: Undefined symbols:
>     _JS_Init
>     _JS_InitStandardClasses
>     _JS_NewContext
>     _JS_NewObject
> 
> The following files are included in the same directory as simple.c:
> 
>     jsapi.h
>     jsautocfg.h
>     jscompat.h
>     jslong.h
>     jsosdep.h
>     jsotypes.h
>     jspubtd.h
>     jstypes.h
>     libjs.a
> 
> Any input or direction would be helpful.
> 
> Thanks,
> Jeremy
> 

Your source file doesn't need to be in the same directory, and you could
use the -I and -L flags to the cc command to specify where they are. 
You then would include jsapi.h using <> rather than "", that's the way
it works for me.  You also might want to use -Wl,-R if you are using gcc
so that the spidermonkey shared library (if not compiled with -static)
doesn't need to be in LD_LIBRARY_PATH.

In my case I installed spidermonkey into /usr/local/spidermonkey/, and
can both use the shared library, or compile applications statically
against it adding -static to the cc command, you might want to check my
spidermonkey-config example script and the GNUMakefile (made for GNU
make):

(spidermonkey-config is in util/ and GNUMakefile into src/)
http://cvs.pulsar-zone.net/cgi-bin/cvsweb.cgi/mmondor/tests/js-test/

Basically, spidermonkey-config is a helper script for makefiles which
can report the proper CFLAGS and/or LDFLAGS:

 --- (ttyp4) mmondor@hal.xisop $ spidermonkey-config     

Usage: spidermonkey-config [-v] [-c] [-l] [-d]

 -v : Shows SpiderMonkey version
 -c : Shows flags suitable to append to $CFLAGS
 -l : Shows flags suitable to append to $LDFLAGS
 -d : Shows debugging versions of the flags

 --- (ttyp4) mmondor@hal.xisop $ spidermonkey-config -cl
-I/usr/local/spidermonkey/include -DXP_UNIX
-Wl,-R/usr/local/spidermonkey/lib -L/usr/local/spidermonkey/lib -ljs
 --- (ttyp4) mmondor@hal.xisop $

A similar system should work on most unix systems (used this on NetBSD
and Linux so far).  Hope this helps,

Matt

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