libbuild2-autoconf

GNU Autoconf emulation build system module for build2.

Specifically, this module provides an in-based rule for processing config.h.in files. Besides the Autoconf special line flavor (#undef), it also supports the CMake (#cmakedefine, #cmakedefine01) and Meson (#mesondefine) variants. Note that the CMake ${VAR} style substitutions are not supported, only the @VAR@ style (see Modifying upstream source code during build for one way to deal with ${VAR}).

Similar to Autoconf, this module provides builtin support for a number of common HAVE_* configuration checks with projects being able to add custom ones. However, the values of these checks are not discovered by dynamic probing, such as trying to compile a test program to determine if the feature is present. Instead, they are set to static expected values based on the platform/compiler macro checks (see note at the beginning of Project Configuration for rationale).