Pull request overview

Fixes mojo run / mojo debug ignoring -Xlinker by extracting those flags from CLI args and forwarding them via MODULAR_MOJO_MAX_SYSTEM_LIBS, eliminating “unused -Xlinker” warnings and restoring expected runtime linking behavior (Fixes #6155).

Changes:

• Add argument parsing to capture -Xlinker / -Xlinker,... flags for run and debug and append them into MODULAR_MOJO_MAX_SYSTEM_LIBS.
• Strip forwarded -Xlinker flags from the argv passed to the underlying driver while preserving args after --.
• Add unit tests covering forwarding behavior, combined-flag syntax, and existing env var appends.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
mojo/python/mojo/_entrypoints.py	Implements -Xlinker extraction/forwarding for mojo run and mojo debug before execve.
mojo/python/test/test_entrypoints.py	Adds tests validating env forwarding and argv filtering behavior.

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