RTEMS | libdl/sparc: Fix overflow in relocation bitmask (!1219)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1219

Project:Branches: D3athSkulll/rtems:libdl-sparc-overflow to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

\_BM(x) produces 64-bit values which are implicitly converted to int in reloc_target_bitmask. For x = 32, this causes truncation from 4294967295 to -1 on 32-bit targets, triggering -Woverflow. Used uint32_t and cast the result to avoid implicit narrowing.

Fixes #5557

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1219
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