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fix(build): allow pure wheels without a compiler #925

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fix(build): allow pure wheels without a compiler #925

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31 changes: 16 additions & 15 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,19 +1,5 @@
cmake_minimum_required(VERSION 3.15)
project(${SKBUILD_PROJECT_NAME} LANGUAGES C CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Locate Python (interpreter needed to find nanobind cmake dir)
find_package(Python COMPONENTS Interpreter Development.Module REQUIRED)

# Locate nanobind via the installed Python package
execute_process(
COMMAND "${Python_EXECUTABLE}" -c "import nanobind; print(nanobind.cmake_dir())"
OUTPUT_VARIABLE NB_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE
)
find_package(nanobind CONFIG REQUIRED HINTS "${NB_DIR}")
project(${SKBUILD_PROJECT_NAME} LANGUAGES NONE)

# Set -DRTB_BUILD_EXTENSIONS=OFF to skip both compiled extensions and build a
# genuinely pure-Python wheel instead -- both _fknm_c and _frne_c have
Expand All @@ -29,6 +15,21 @@ find_package(nanobind CONFIG REQUIRED HINTS "${NB_DIR}")
option(RTB_BUILD_EXTENSIONS "Build the compiled _fknm_c/_frne_c nanobind extensions" ON)

if(RTB_BUILD_EXTENSIONS)
enable_language(C CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Locate Python (interpreter needed to find nanobind cmake dir)
find_package(Python COMPONENTS Interpreter Development.Module REQUIRED)

# Locate nanobind via the installed Python package
execute_process(
COMMAND "${Python_EXECUTABLE}" -c "import nanobind; print(nanobind.cmake_dir())"
OUTPUT_VARIABLE NB_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE
)
find_package(nanobind CONFIG REQUIRED HINTS "${NB_DIR}")

# -----------------------------------------------------------------------
# _frne_c — Newton-Euler inverse dynamics
# ne.c / vmath.c are pure C maths; frne_nb.cpp is the nanobind glue.
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