Add conda build option and CUDA target includes

[JanuszL]

Adds a conda packaging build option and switches CUDA-header consumers to
the CMake CUDAToolkit target directory.

It absorbs https://github.com/conda-forge/nvidia-dali-python-feedstock/tree/main/recipe/patches.

Category:

Other (Build / Configuration)

Description:

This change adds BUILD_FOR_CONDA, enables it from the conda native-libs and
Python-bindings recipes, and keeps the default source and wheel build behavior
unchanged when the option is disabled.

When BUILD_FOR_CONDA=ON, the build:

• uses conda's lib layout for nvImageCodec runtime lookup and RPATH;
• prefers the shared libtar library instead of forcing libtar.a;
• emits conda install guidance for dynamically loaded CUDA toolkit libraries;
• keeps conda-provided CUDA architecture settings intact.

The change also requires CMake's CUDAToolkit package and uses
CUDAToolkit_TARGET_DIR/include directly for CUDA-family generated stubs and
include directories. This covers the CUDA, cuFile, cuFFT, NPP, nvImageCodec,
NVML, and nvCUVID stub generation paths without depending on the trimmed
CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES value.

For the split conda package build, bundled FFTS and cocoapi static targets are
not rebuilt when PREBUILD_DALI_LIBS=ON.

Additional information:

Affected modules and functionalities:

• CMake configuration: CMakeLists.txt
• Dependency lookup: cmake/Dependencies.common.cmake
• Conda recipes:
  • conda/dali_native_libs/recipe/build.sh
  • conda/dali_python_bindings/recipe/build.sh
• CUDA-header stub generation and include paths:
  • dali/core/CMakeLists.txt
  • dali/kernels/signal/fft/CMakeLists.txt
  • dali/npp/CMakeLists.txt
  • dali/nvimgcodec/CMakeLists.txt
  • dali/operators/video/dynlink_nvcuvid/CMakeLists.txt
  • dali/util/CMakeLists.txt
• Dynamic loader diagnostics:
  • dali/core/dynlink_cufile.cc
  • dali/core/dynlink_nvcomp.cc
  • dali/kernels/signal/fft/cufft_wrap.cc
  • dali/npp/npp_wrap.cc
  • dali/nvimgcodec/nvimgcodec_wrap.cc
  • dali/operators/operators.cc
• Minor typo fix in dali/util/nvml_wrap.cc

Key points relevant for the review:

• BUILD_FOR_CONDA defaults to OFF; default builds should retain existing
  behavior.
• The option is propagated through propagate_option(BUILD_FOR_CONDA), which
  produces FOR_CONDA_ENABLED for the C++ loader diagnostics.
• find_package(CUDAToolkit REQUIRED) is now used so the build can consistently
  reference CUDAToolkit_TARGET_DIR/include.
• The obsolete nvJPEG2K conda-forge patch was intentionally not carried over.

Tests:

• Existing tests apply
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Previously configured successfully with:

• default reduced CMake configuration
• BUILD_FOR_CONDA=ON
• BUILD_FOR_CONDA=ON with explicit CUDAToolkit_TARGET_DIR

For this metadata refresh, git diff --check upstream/main...HEAD passes.

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
  • Doxygen
  • RST
  • Jupyter
  • Other
• N/A

DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: DALI-4681

[greptile-apps]

Greptile Summary

This PR adds a BUILD_FOR_CONDA CMake option (defaulting to OFF) to support conda-forge packaging while keeping all default wheel/source builds unchanged. When enabled, it switches nvimgcodec to lib instead of lib64, prefers shared libtar, honours an explicit CUDAToolkit_TARGET_DIR include path, and emits conda-specific install guidance from the dynamic-loader diagnostics.

• All stub generators are migrated from the ad-hoc CUDA_TOOLKIT_INCLUDE_MAJOR_DIRECTORY / CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES_DIRECTIVE pattern to ${CUDAToolkit_TARGET_DIR}/include, made possible by adding find_package(CUDAToolkit REQUIRED) unconditionally.
• The FOR_CONDA_ENABLED preprocessor define (produced by propagate_option(BUILD_FOR_CONDA)) gates the new error messages in six .cc files; the non-conda paths are fully preserved.
• dali/util/nvml_wrap.cc fixes a pre-existing "dirver" typo.

Confidence Score: 5/5

The change is additive and off-by-default; default builds are unaffected except for the transparent adoption of CUDAToolkit_TARGET_DIR for stub generation.

All new code paths are gated behind BUILD_FOR_CONDA=OFF. The unconditional migration of stub generators to CUDAToolkit_TARGET_DIR is backward-compatible on standard CUDA installations, and find_package(CUDAToolkit REQUIRED) succeeds in every environment where project(... CUDA ...) already compiles. The two findings are unused-variable cleanup nits with no functional impact.

No files require special attention.

Important Files Changed

Filename	Overview
CMakeLists.txt	Adds find_package(CUDAToolkit REQUIRED), BUILD_FOR_CONDA option, and conda-specific RPATH handling; removes the CUDA_TOOLKIT_INCLUDE_MAJOR_DIRECTORY if/else but leaves its SEMICOLON_POS guard as dead code on line 49.
cmake/Dependencies.common.cmake	Guards libtar static-preference and FFTS/CocoAPI builds behind BUILD_FOR_CONDA and PREBUILD_DALI_LIBS checks; straightforward and correct.
dali/core/CMakeLists.txt	cuda.h and cufile.h stub generators updated to CUDAToolkit_TARGET_DIR; nvcomp stub (line 108) still uses the old CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES_DIRECTIVE, so that computation block remains necessary.
dali/util/CMakeLists.txt	nvml.h stub updated to CUDAToolkit_TARGET_DIR; the SEMICOLON_POS / CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES_DIRECTIVE computation block (lines 84-93) is now dead code.
dali/nvimgcodec/nvimgcodec_wrap.cc	Correctly toggles lib/lib64 path via FOR_CONDA_ENABLED macro and provides conda install guidance on dlopen failure.
dali/operators/operators.cc	Adds conda-specific version-requirement error message with single-quoted conda spec; non-conda branch restructured with inline CUDA_VERSION computation.

_{Reviews (3): Last reviewed commit: "Add conda build option and CUDA target i..." | Re-trigger Greptile}

[JanuszL]

@greptile review

[dali-automaton]

CI MESSAGE: [49621159]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [49621159]: BUILD FAILED

[dali-automaton]

CI MESSAGE: [49621159]: BUILD PASSED

[dali-automaton]

CI MESSAGE: [49643983]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [49643983]: BUILD FAILED

[dali-automaton]

CI MESSAGE: [49679151]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [49679151]: BUILD FAILED

[dali-automaton]

CI MESSAGE: [49679151]: BUILD PASSED

[dali-automaton]

CI MESSAGE: [53088284]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [53088284]: BUILD FAILED

[dali-automaton]

CI MESSAGE: [53103732]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [53103732]: BUILD PASSED