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migrating gcc-2.95 on Solaris to gcc-4.0.2 to Suse Linux

Hi List,

The requirement of my current project is migrating Solaris apps to
Linux . A whole lot of C/C++ apps compiled using gcc-2.95.2 on
Solaris have to be migrated to gcc-4.0.2 on Suse-10 ,I tried
googling /searching gcc mailing lists but I am not able to come up with
something definite.

This is what i got from searching :
I need to build gcc-4.0.2 on Solaris and recompile the entire
application stack , and fix errors one by one ,that could be exhausting
and very regressive when i am talking of 513 Makefiles ,and 54,675 C/C++
source files. Is this big bang approach the only way or is there some
help as in:

a) things to consider before such a migration
b) issues I am likely to face while moving from gcc-2.9X to gcc-4.0.X
c) any views on the Solaris to Linux angle
d) Any docs/websites which could help me


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