Build Configuration

The build is controlled by Makefile_settings, Makefile_machine, and addons/Makefile_addons_settings.

Makefile Settings

USEGSL: Enables GSL-dependent numerical routines. The public configuration expects this to remain enabled.
OPENMPMACHINE: Enables OpenMP compilation and the numberThreads run-time parameter.
ADDONSON: Enables the CLASS-style parser and Cython support sockets required by the public Python wrapper.

Addon Settings

The standard wrapper build uses CLASSLIBON=1 and PXDON=1. The PXD templates are expanded during the Python build so Cython sees the same structures and compile-time options as the C library.

Compiler and Linker Variables

CC and AR select the compiler and archive tool. PYTHON selects the interpreter used for the extension build. Dependency paths can be supplied with GSL_INCLUDE, GSL_LIB, FFTW3_INCLUDE, and FFTW3_LIB.

Recommended Pattern

Make configuration changes before a clean rebuild:

make clean
make PYTHON=python3 all

Do not reuse object files after changing OpenMP, addon, compiler, or ABI-related settings. The wrapper performs an ABI-size check during initialization and will reject a mismatched extension/library pair.

Build Artifacts

The build produces wlcf, libwlcf.a, object files beneath build/, a generated python/cwlcfpy.pxd, and an installed wlcfpy extension. The generated products are excluded from version control.