[Tmk-devel] 32/64 bit system

[Yamauchi H. <hi...@mp...>]

Hi, (currently I send this mail to both mailing list.)

Let's discuss a bit about 32/64 coexistence system with tmk.

Recently, I use AMD optaron system (64bit SuSE Linux). I can compile
and run both 32bit and 64 bit executables on this system. This is also
the same on SunOS, I can compile both kind of executables (IRIX
nobelium is still down from almost two weeks ago, then I have not
tried this on IRIX yet.)

In the case of gcc, the difference of compiling for 64 bit is just
adding option -m64 -fPIC -Wl,rpath,/64bit/lib/path. However, the
problem is that:

  1. It looks like no consistent way to find a 64 bit version library
  for packages, ex. the library directory changed under /usr/lib64,
  library name is libsomething64.a, /usr/lib/sparcv9 (on Sun) and so
  forth.
  
  2. tmk may not know how many bit system now it is in, or user want
  to compile which executables.

Then I tweaked .tmk/cache/config* file. But once you fix the config
file, you can only compile 64 bit (or 32 bit).

Can this handle by just put another module, or modified cxx module?  I
found some fragment called METAOPT which somehow think about 64
bit also. However, I do not know this can handle the situation.

Because 32/64bit switching changes most of the (sometimes
unpredictable) library path of packages, then I think tmk should know
in what kind of mode, and one ./tmk/cache/config* file is selected
according to the mode.

And also the object file directory name is changed like, Debian64_3.0,
seems nice. Martin suggests me this can be treated as a kind of cross
compiling method. And selecting 32/64bit mode is subjective, a way to
tell this to tmk is necessary.

So, I suggest to introduce next feature to tmk.

    A mode : this could not be only 32bit/64bit environment, but any
    other something. (Although in meantime 32bit/64bit is enough for me)

    A .tmk/cache/config* file is selected according to the mode, 

Any suggestions? If there is a easy and good solution, I might
implement it. 

Regards, 
---------------------------------------------------------------------
Yamauchi, Hitoshi : Max-Planck-Institut fuer Informatik AG4
 --E-mail-- yam...@mp...
/_________/ http://www.mpi-sb.mpg.de/~hitoshi/