Subj : OSX Build Issue w/ libjs.so
To   : netscape.public.mozilla.jseng
From : Sajid Raza
Date : Thu May 27 2004 07:00 pm

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Well, my case, may be very specific, its working but I thought it might
be worth sharing:

Basically, I'm using loading libraries into Apache, SpiderMonkey's
libjso.so is one of them. Everything works perfectly on Linux/X86. On
Mac OSX, the shared library builds fine, but loading it into Apache
generates:

libjs.so (not a Mach-O file, bad magic number)

 From a bit of Googling it seems I need to do two things, the first of
which seems dubious:

Build all source with -fno-common

 From OSX libtool man page:
"Dynamically  linked libraries  have two restrictions: No symbol may be
defined in more than one object file and no common symbol can be used."

Since the OSX libtool's a little different run (static is the default):

libtool -dynamic  -framework System -o Darwin_DBG.OBJ/libjs.so
Darwin_DBG.OBJ/jsapi.o Darwin_DBG.OBJ/jsarena.o Darwin_DBG.OBJ/jsarray.o
Darwin_DBG.OBJ/jsatom.o Darwin_DBG.OBJ/jsbool.o Darwin_DBG.OBJ/jscntxt.o
Darwin_DBG.OBJ/jsdate.o Darwin_DBG.OBJ/jsdbgapi.o
Darwin_DBG.OBJ/jsdhash.o Darwin_DBG.OBJ/jsdtoa.o Darwin_DBG.OBJ/jsemit.o
Darwin_DBG.OBJ/jsexn.o Darwin_DBG.OBJ/jsfun.o Darwin_DBG.OBJ/jsgc.o
Darwin_DBG.OBJ/jshash.o Darwin_DBG.OBJ/jsinterp.o
Darwin_DBG.OBJ/jslock.o Darwin_DBG.OBJ/jslog2.o Darwin_DBG.OBJ/jslong.o
Darwin_DBG.OBJ/jsmath.o Darwin_DBG.OBJ/jsnum.o Darwin_DBG.OBJ/jsobj.o
Darwin_DBG.OBJ/jsopcode.o Darwin_DBG.OBJ/jsparse.o
Darwin_DBG.OBJ/jsprf.o Darwin_DBG.OBJ/jsregexp.o Darwin_DBG.OBJ/jsscan.o
Darwin_DBG.OBJ/jsscope.o Darwin_DBG.OBJ/jsscript.o
Darwin_DBG.OBJ/jsstr.o Darwin_DBG.OBJ/jsutil.o Darwin_DBG.OBJ/jsxdrapi.o
Darwin_DBG.OBJ/prmjtime.o   -Lfdlibm/Darwin_DBG.OBJ -lfdm -lgcc

The difference being the switch -dynamic, and -lgcc.

When I tried manually linking against the libjs.so generated by the
original config scripts, I received errors. My modified Darwin.mk is 
attached.

-S

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# -*- Mode: makefile -*-
#
# The contents of this file are subject to the Netscape Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/NPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is Mozilla Communicator client code, released
# March 31, 1998.
#
# The Initial Developer of the Original Code is Netscape
# Communications Corporation.  Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): 
#
#  Steve Zellers (zellers@apple.com)
#
# Alternatively, the contents of this file may be used under the
# terms of the GNU Public License (the "GPL"), in which case the
# provisions of the GPL are applicable instead of those above.
# If you wish to allow use of your version of this file only
# under the terms of the GPL and not to allow others to use your
# version of this file under the NPL, indicate your decision by
# deleting the provisions above and replace them with the notice
# and other provisions required by the GPL.  If you do not delete
# the provisions above, a recipient may use your version of this
# file under either the NPL or the GPL.
#

#
# Config for Mac OS X as of PR3
# Just ripped from Linux config
#

CC = cc
CCC = g++
CFLAGS +=  -Wall -Wno-format -fno-common
OS_CFLAGS = -DXP_UNIX -DSVR4 -DSYSV -D_BSD_SOURCE -DPOSIX_SOURCE -DDARWIN

RANLIB = ranlib
MKSHLIB = libtool -dynamic $(XMKSHLIBOPTS) -framework System -lgcc

#.c.o:
#      $(CC) -c -MD $*.d $(CFLAGS) $<

CPU_ARCH = $(shell uname -m)
ifeq (86,$(findstring 86,$(CPU_ARCH)))
CPU_ARCH = x86
OS_CFLAGS+= -DX86_LINUX
endif
GFX_ARCH = x

OS_LIBS = -lc -framework System

ASFLAGS += -x assembler-with-cpp

ifeq ($(CPU_ARCH),alpha)

# Ask the C compiler on alpha linux to let us work with denormalized
# double values, which are required by the ECMA spec.

OS_CFLAGS += -mieee
endif

# Use the editline library to provide line-editing support.
JS_EDITLINE = 1

# Don't allow Makefile.ref to use libmath
NO_LIBM = 1


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