ExtractAutoconfVersion

A common pattern found in older build system projects (e.g., curl) is that users might need to interact with an older build system file. Typically this results in a variety of scripts, functions, and copy pasted code to read the AC_INIT value from a configure.ac file. This value is then set as the project version when calling project(). This module instead provides a single command, extract_autoconf_version, that can be used to automatically extract said value and store the value as a cache variable.

This module is provided specifically for codebases that might finally be migrating off of autotools in some manner and have selected CMake as their build system.

Commands

extract_autoconf_version

Extract a version from a call to the AC_INIT macro in configure.ac. The output variable will be cached and the DOC argument set as its documentation string if provided.

Required Parameters

output

Name of the output variable to store the value in.

Keyword Parameters

ADVANCED

Mark the variable as ADVANCED so it does not appear in ccmake or cmake-gui's cache variable list by default.

FILE

File to read the AC_INIT macro from.

By default this is ${CMAKE_CURRENT_SOURCE_DIR}/configure.ac

REGEX

Regular expression to extract the version value from.

By default this is ^AC_INIT\\([^,]+,\\[([0-9]+)[.]([0-9]+)?[.]?([0-9]+)?\\].+$

DOC

Documentation string to set the cache variable to.