[gfsd]Versions compatibility questions

[Philippe Gamba - Sun Microsystems]

Hello,

Using gcc on Solaris (2.5.1, 2.6 or 2.8), I would like to understand 2 differences between the 2 versions of gcc I work with :
older one       : 2.7.2.1
newer one    : egcs-2.91.66
 

• If I link with 2.7.2.1, the binary generated has very few symbols in dynsym (dynamic symbol table). That provoques run-time linker to fail because of 'unresolved symbol'error.

• If I link with egcs-2.91.66, the binary generated has a complete dynsym. The run-time linker succeeds. But I cannot compile with my usual options that are : $ /usr/gnu/bin/gcc -c  -MDupdate SunOS5.6_DBG.OBJ/.md <file>.c

$ gcc: unrecognized option `-MDupdate'
These options are accepted by 2.7.2.1

What happens ?
- why 2.7.2.1 does not generate a full dynsym ?
- why egcs-2.91.66 does not understand -MDupdate ?
and more over what is the best solution to have both working ?

Thanks a lot for your answers,
 

Philippe