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These changes implement a suitable relocation output in the image.
The code is still not working 100% but these changes are a big
improvement.
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Support has been added to load relocation record on demand. The
relocation records are not read when the object file is first
opened and read. They are read only when being written to the
output file. This save loading lots of records into memory
from libraries to be thrown away.
The RAP format now supports writing out relocation records.
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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.
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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.
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