Fix duplicate libmps_parser.so in libcuopt wheel

[rgsl888prabhu]

Summary

• The mps_parser install target in cpp/libmps_parser/CMakeLists.txt hardcoded DESTINATION lib, while the parent cpp/CMakeLists.txt installs to the platform-correct lib64 (on x86_64) via rapids_cmake_install_lib_dir(). This caused libmps_parser.so to appear in both lib/ and lib64/ in the libcuopt wheel, wasting ~350 KB.
• Replaced the hardcoded lib with rapids_cmake_install_lib_dir() so both install commands resolve to the same directory, eliminating the duplicate.

Details

In the current libcuopt_cu13 wheel (libcuopt_cu13-26.6.0a103), libmps_parser.so (357,240 bytes) appears twice:

357240  libcuopt/lib/libmps_parser.so
357240  libcuopt/lib64/libmps_parser.so

The root cause is two independent install(TARGETS mps_parser ...) commands:

1. cpp/libmps_parser/CMakeLists.txt:139 → DESTINATION lib (hardcoded)
2. cpp/CMakeLists.txt:576 → DESTINATION ${_LIB_DEST} → lib64 (via rapids_cmake_install_lib_dir)

Test plan

• Verify the libcuopt wheel only contains libmps_parser.so in lib64/, not in lib/
• Verify standalone mps_parser build still installs to the correct platform lib directory
• Verify cuopt-mps-parser Python wheel build is unaffected (uses EXCLUDE_FROM_ALL + custom destinations)

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📥 Commits

Reviewing files that changed from the base of the PR and between 00c4500 and 208d3bb.

📒 Files selected for processing (1)

• cpp/libmps_parser/CMakeLists.txt

✅ Files skipped from review due to trivial changes (1)

• cpp/libmps_parser/CMakeLists.txt

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📝 Walkthrough

Walkthrough

Updated CMake install for mps_parser to install the built shared library into a configurable library directory variable instead of hardcoding lib. The variable is initialized via rapids_cmake_install_lib_dir(mps_parser_lib_dir) before the install(TARGETS ...) call; other install/export logic unchanged.

Changes

Cohort / File(s)	Summary
CMake Install Configuration cpp/libmps_parser/CMakeLists.txt	Replaced hardcoded install destination lib with ${mps_parser_lib_dir} and added rapids_cmake_install_lib_dir(mps_parser_lib_dir) immediately before the install(TARGETS mps_parser ...) invocation. No changes to exports or include installation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main fix: removing a duplicate libmps_parser.so library from the libcuopt wheel.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context about the duplicate install issue, root cause, and the solution implemented in the CMakeLists.txt file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-duplicate-libmps-parser

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[rgsl888prabhu]

/merge