RTEMS | cpukit/libdl: Fix loading symbols from an object file at runtime (!460)

[Chris Johns (@chris)]

Chris Johns created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/460

Project:Branches: chris/rtems:5234-runtime-symbols-loading-is-broken to rtems/rtos/rtems:main
Author:   Chris Johns
Assignee: Chris Johns



## Summary

cpukit/libdl: Fix loading symbols from an object file at runtime

- Assume a relocation record with a symbol name with a length of 0 is resolved. ARM seems to create a symbol with no name for R_ARM_V4BX relocation records.
- Move the addition of the rtems_rtl_base_sym_global_add symbol to the global symbol table to the weak rtems_rtl_base_global_syms_init call. If symbols are embedded the support for runtime loading symbols is over loaded. This change is required so the base object has a valid global symbol table attached to track dependencies.

Fixes #5234

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/460
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