hyperscan: skip compilation on unused libs

[zhxie]

Signed-off-by: Xie Zhihao [email protected]

Commit Message: hyperscan: skip compilation on unused libs
Additional Description:
Risk Level: Low
Testing: N/A
Docs Changes: N/A
Release Notes: N/A
Platform Specific Features: N/A

[repokitteh-read-only]

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🐱

Caused by: #27534 was opened by zhxie.

see: more, trace.

[repokitteh-read-only]

CC @envoyproxy/dependency-shepherds: Your approval is needed for changes made to (bazel/.*repos.*\.bzl)|(bazel/dependency_imports\.bzl)|(api/bazel/.*\.bzl)|(.*/requirements\.txt)|(.*\.patch).
envoyproxy/dependency-shepherds assignee is @phlax

🐱

Caused by: #27534 was opened by zhxie.

see: more, trace.

[phlax]

thanks for taking a look at this @zhxie - really appreciated

[zhxie]

There is not too much unused libs to remove.

In fact, Hyperscan does not have many targets to compile, but it compiles a separate copy of the code for each platform (SSE4, AVX, AVX2...) in order to optimize performance on different platforms.

[phlax]

thanks for following up on this @zhxie, lgtm

locally my comparison (test of 1) timings:

before:

INFO: Elapsed time: 399.542s, Critical Path: 399.16s

after

INFO: Elapsed time: 347.085s, Critical Path: 338.38s

as this definitely does build on all cores - i think we should try and figure out how to get the ci machines to build it locally rather than compiling with RBE