[TRTLLM-10793][feat] Add BOLT compatible build flags for further experimental usage.

[hyukn]

Summary by CodeRabbit

• Chores
  • Added an optional build configuration option for BOLT compatibility support.
  • When enabled, applies specialized compiler and linker flags to optimize binary handling and preserve relocation information required for BOLT processing.
  • Ensures compatible dynamic linking for system libraries when BOLT optimization is active.

Description

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds BOLT compatibility support to the build system by introducing a new ENABLE_BOLT_COMPATIBLE CMake option that applies compiler/linker flags for BOLT instrumentation, disables binary stripping, configures conditional nanobind module building with NOSTRIP, and forces NVRTC dynamic linking when needed.

Changes

Cohort / File(s)	Summary
BOLT Compatibility Configuration cpp/CMakeLists.txt	Introduces ENABLE_BOLT_COMPATIBLE option (default OFF) that applies BOLT-specific compiler flags (-fno-reorder-blocks-and-partition, --fno-plt), linker flags (--emit-relocs), and disables binary stripping by setting CMAKE_STRIP to empty string when enabled (non-Windows only).
Conditional Module Building cpp/tensorrt_llm/executor/cache_transmission/nixl_utils/CMakeLists.txt, cpp/tensorrt_llm/nanobind/CMakeLists.txt	Modifies nanobind module construction to conditionally apply NOSTRIP flag to nanobind_add_module calls when ENABLE_BOLT_COMPATIBLE is true, otherwise preserves original behavior.
Build Script Updates scripts/build_wheel.py	Adds safeguard that forces NVRTC_DYNAMIC_LINKING=ON when ENABLE_BOLT_COMPATIBLE=ON is present in CMake variables, with explanatory message about static library relocation requirements.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description only contains the template with minimal substantive content; critical sections like Description, Test Coverage, and required checklist items are empty or incomplete.	Complete the Description section explaining the issue and solution, add Test Coverage details, and fill in the PR checklist appropriately to meet repository guidelines.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and specifically summarizes the main change—adding BOLT-compatible build flags with experimental status.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 2

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

scripts/build_wheel.py (1)

1-3: ⚠️ Potential issue | 🟡 Minor

Update the NVIDIA copyright header year.

This file was modified in 2026, so the header should reflect the latest meaningful modification year.

📝 Suggested update

-# SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2022-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.

As per coding guidelines: “All TensorRT-LLM source files (.cpp, .h, .cu, .py, and other source files) should contain an NVIDIA copyright header with the year of latest meaningful modification”.

🤖 Fix all issues with AI agents

In `@cpp/CMakeLists.txt`:
- Around line 372-399: The ENABLE_BOLT_COMPATIBLE block is currently only
guarded by NOT WIN32, which still runs on macOS and injects ELF/GNU-specific
flags; update the guard to explicitly target Linux/ELF (e.g., check for Linux or
UNIX and CMAKE_SYSTEM_NAME == "Linux") and, if ENABLE_BOLT_COMPATIBLE is set on
a non-Linux host, emit a fatal CMake error explaining BOLT is Linux/ELF-only.
Ensure you update the conditional that surrounds the modifications to
CMAKE_C_FLAGS, CMAKE_CXX_FLAGS, CMAKE_SHARED_LINKER_FLAGS,
CMAKE_MODULE_LINKER_FLAGS, CMAKE_EXE_LINKER_FLAGS, and the CMAKE_STRIP change so
those flags are only set on Linux; add the fatal error path to prevent
macOS/ld64 or other platforms from proceeding.

In `@scripts/build_wheel.py`:
- Around line 601-612: The BOLT detection currently only matches
"ENABLE_BOLT_COMPATIBLE=ON" so other CMake truthy values (TRUE/1/YES) are
missed; update the detection logic around bolt_enabled (which iterates
extra_cmake_vars) to treat any value after "ENABLE_BOLT_COMPATIBLE=" as truthy
by normalizing/rstripping and comparing against a set {"ON","TRUE","1","YES"}
(or parse the RHS case-insensitively) so that when bolt_enabled is true you
still append "-DNVRTC_DYNAMIC_LINKING=ON" to cmake_def_args if
nvrtc_dynamic_linking is false; also update the file header year from 2022-2025
to 2022-2026.

[dhansen-nvidia]

Overall, LGTM

[hyukn]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #35388 [ run ] triggered by Bot. Commit: 063b12d

[tensorrt-cicd]

PR_Github #35388 [ run ] completed with state SUCCESS. Commit: 063b12d
/LLM/main/L0_MergeRequest_PR pipeline #27334 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[hyukn]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #35425 [ run ] triggered by Bot. Commit: 063b12d

[tensorrt-cicd]

PR_Github #35425 [ run ] completed with state SUCCESS. Commit: 063b12d
/LLM/main/L0_MergeRequest_PR pipeline #27368 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[hyukn]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #35510 [ run ] triggered by Bot. Commit: 063b12d

[tensorrt-cicd]

PR_Github #35510 [ run ] completed with state SUCCESS. Commit: 063b12d
/LLM/main/L0_MergeRequest_PR pipeline #27417 completed with status: 'SUCCESS'

[tburt-nv]

I'm not very familiar with these compiler options or BOLT, but this seems like a safe way to begin experimenting with them.