From: Daniel Berger <djberg96@...>
Date: 2007-10-19T05:16:37+09:00
Subject: Re: rocaml 0.6.0: fast, easy Ruby extensions in Objective Caml

On Oct 18, 1:18 pm, Mauricio Fernandez <m...@acm.org> wrote:
<snip>

> It seems we're almost there (we went through the critical non-PIC code
> relocation phase :-)
>
> According to google, __muldi3 is an internal GCC library function. Do you have
> a native linker in addition to GCC's? GCC's will automatically link against
> libgcc, but it seems that's not the case with the native one.

Did I mention that I built Ruby with Sun Studio 12, but OCaml with gcc
4? Ocaml seemed to demand it. :|

> At any rate, linking against either libgcc.a or libgcc_s.so.1 should work;
> something like this maybe?
>
> diff -rN -u -w old-rocaml/rocaml_extconf.rb new-rocaml/rocaml_extconf.rb
> --- old-rocaml/rocaml_extconf.rb        2007-10-18 21:03:41.000000000 +0200
> +++ new-rocaml/rocaml_extconf.rb        2007-10-18 21:03:41.000000000 +0200
> @@ -89,7 +89,9 @@
>
>  # needed by mkmf's create_makefile
>  $LOCAL_LIBS = "#{CAML_TARGET} #{ocaml_native_lib_path}/libasmrun.a #{extra_caml_libs.join(" ")}"
> -
> +# try to add GCC's libgcc, required on Sparc
> +libgcc = Dir["/lib/libgcc*"].first      # maybe some other search path(s)
> +$LOCAL_LIBS << " " << libgcc if libgcc
>
>  # determine whether camlp4 (or camlp5) can be used:
>
> You might have to change the search path. On my platform, libgcc can also be
> found in /usr/lib/gcc/i486-linux-gnu/<gcc version>. Linking against either
> libgcc.a or libgcc_s.so should do.

In my particular case it's /opt/csw/gcc4/lib/libgcc which I added
directly:

djberge-/opt/csw/gcc4/lib-663>ll libg*
lrwxrwxrwx   1 root     root          15 Dec 12  2006 libgcc_s.so -> ./
libgcc_s.so.1
-rwxr-xr-x   1 root     bin        63928 Oct 10  2005 libgcc_s.so.1

It builds correctly. But then I get a different linker error:

LoadError: ld.so.1: ruby: fatal: libgcc_s.so.1: open failed: No such
file or directory - /export/home/djberge/src/ruby/rocaml-0.6.1/foo.so
        from /export/home/djberge/src/ruby/rocaml-0.6.1/foo.so
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `require'
        from (irb):2

LDD led me to the fix:

djberge-/export/home/djberge/src/ruby/rocaml-0.6.1-546>ldd foo.so
        libgcc_s.so.1 =>         (file not found)
        librt.so.1 =>    /lib/librt.so.1
        libpthread.so.1 =>       /lib/libpthread.so.1
        libdl.so.1 =>    /lib/libdl.so.1
        libcrypt_i.so.1 =>       /usr/lib/libcrypt_i.so.1
        libm.so.2 =>     /lib/libm.so.2
        libc.so.1 =>     /lib/libc.so.1
        libaio.so.1 =>   /lib/libaio.so.1
        libmd5.so.1 =>   /lib/libmd5.so.1
        libgen.so.1 =>   /lib/libgen.so.1
        /platform/SUNW,Sun-Blade-100/lib/libc_psr.so.1
        /platform/SUNW,Sun-Blade-100/lib/libmd5_psr.so.1

So, I slapped $LDFLAGS += " -L/opt/csw/gcc4/lib -R/opt/csw/gcc4/lib"
into the rocaml_extconf.rb file. Looks better after that:

djberge-/export/home/djberge/src/ruby/rocaml-0.6.1-605>ldd foo.so
        libgcc_s.so.1 =>         /opt/csw/gcc4/lib/libgcc_s.so.1
        librt.so.1 =>    /lib/librt.so.1
        libpthread.so.1 =>       /lib/libpthread.so.1
        libdl.so.1 =>    /lib/libdl.so.1
        libcrypt_i.so.1 =>       /usr/lib/libcrypt_i.so.1
        libm.so.2 =>     /lib/libm.so.2
        libc.so.1 =>     /lib/libc.so.1
        libaio.so.1 =>   /lib/libaio.so.1
        libmd5.so.1 =>   /lib/libmd5.so.1
        libgen.so.1 =>   /lib/libgen.so.1
        /platform/SUNW,Sun-Blade-100/lib/libc_psr.so.1
        /platform/SUNW,Sun-Blade-100/lib/libmd5_psr.so.1

Back to irb:

irb(main):002:0> require 'foo'
NameError: (eval): uninitialized constant Kernel::Some
        from (eval)
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `require'
        from (irb):2

Hu...what? WTF? Never seen that one before. I dug through /usr/local/
lib/ruby to make sure there wasn't some other "foo" it was picking up
- there isn't.

Any ideas?

Thanks,

Dan