From: Michal Suchanek <hramrach@...>
Date: 2007-04-27T02:30:31+09:00
Subject: Re: [ ruby-Bugs-10303 ] miniruby loads extensions from already installed ruby

On 26/04/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
> Hi,
>
> At Wed, 25 Apr 2007 22:40:28 +0900,
> Michal Suchanek wrote in [ruby-core:11020]:
> > A patch that really fixes the problem for me. It also fixes the weird
> > miniruby crash while loading extensions.
>
> > +    argvptr = strrchr(origargv[0], '/');
> > +    if(!argvptr) argvptr = origargv[0];
> > +    if(!strstr(argvptr, "miniruby")) {
>
> I do not like to include miniruby specific code and remain in
> installed version.  If the problem were just for extensions,
> linking dmydln.o would solve it...
>
I do not like it either. Of course, one could ifdef the change instead
of plain if, and compile the object with a define for miniruby. But I
would not want to maintain such patch.

As it turns out, ruby and miniruby only differ in the way
libruby-static is linked in. For miniruby it is linked directly by
full name, for ruby it is looked up with -l option.
So linking in another file would not fix the extensions for miniruby
nor prevent miniruby from loading potetntially broken and incompatible
extensions that are already installed. I think the object is present
in libruby anyway.
Actually the crash is quite mysterious and has probably something to
do with OS X linker subtleties I do not understand. Apparently it puts
the same objects together in a different way when linking miniruby
resulting in executable that behaves differently.

gcc -g -O2 -pipe -fno-common  -DRUBY_EXPORT  -L. -L/sw/lib   main.o
libruby-static.a -ldl -lobjc   -o miniruby
/usr/bin/ld: warning multiple definitions of symbol _setregid
libruby-static.a(process.o) definition of _setregid in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libdl.dylib(setregid.So)
definition of _setregid
/usr/bin/ld: warning multiple definitions of symbol _setreuid
libruby-static.a(process.o) definition of _setreuid in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libdl.dylib(setreuid.So)
definition of _setreuid
gcc -g -O2 -pipe -fno-common  -DRUBY_EXPORT  -L. -L/sw/lib   main.o
-lruby-static -ldl -lobjc   -o ruby
/usr/bin/ld: warning multiple definitions of symbol _setregid
./libruby-static.a(process.o) definition of _setregid in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libdl.dylib(setregid.So)
definition of _setregid
/usr/bin/ld: warning multiple definitions of symbol _setreuid
./libruby-static.a(process.o) definition of _setreuid in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libdl.dylib(setreuid.So)
definition of _setreuid

Thanks

Michal