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gulfemsavrun 69c38be839 Reapply "Reland "[llvm-profgen] Add support for ETM trace decoding"" … (#194730)
…(#194695)

This relands the original commit
e3bd61890e (#191584).

The original change was reverted in the following commits:

1) ec9d7d18bd (#194087) 
2) c26ae41c87 (#194695)

This reland incorporates the following fixes:

1) Change LLVM_ENABLE_OPENCSD to default to OFF (opt-in).

2) Parse the OpenCSD version from ocsd_if_version.h and gate OpenCSD
support on a minimum version of 1.5.4 to avoid compilation errors.

3) Refactor the test feature detection to use a
configure-time LLVM_HAVE_OPENCSD variable instead of runtime checks in
lit.local.cfg.
2026-04-28 20:46:51 -07:00
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