This also adds support to the ELF classes that wrap libelf. While
this is now done and seems to work I will not be using an ELF
file to hold the metadata after all.
The refactoring allows better reuse of the ELF support and cleans up
some hacks from the generic file and archive handling improving the
separation of the file handling from the file format, ie ELF. The
handling of ELF object files and ELF object files inside archives
is cleaner.
The refactor cleaned up the symbol handling where the symbols now
reside in the ELF file object and references are take in symbol
pointer containers and symbol table containers.
The main purpose of the refactor is to allow support for creating
and writing ELF files.
Also added an rtems-syms command where special symbol support
can be added.
If an object on the command line depends on another object the output
code wrote the object files and then the dependent files and a
command line object file that is dependent ended up in the object
and dependent lists. A simple merge and unique fixed it.
Also moved the script generation code into a separate function
that can be used in a application container.
Add a -C (also --cc) option to allow the CC to be used when linking to be
provided by the user rather than using the path. This support allows user
who work with the full path to tools rather than the environment to make
use of the linker without them needing to play with environment table.
Rename rld-gcc.[h.cpp] to rld-cc.[h,cpp] because gcc may not be the
only compiler/linker used by the RTEMS project.
