FindIconv: Add version support

Issue: #21857
parent ec5f7675
FindIconv-version
-----------------
* The :module:`FindIconv` module now has version support.
......@@ -25,6 +25,24 @@ The following variables are provided to indicate iconv support:
The iconv libraries to be linked.
.. variable:: Iconv_VERSION
.. versionadded:: 3.21
The version of iconv found (x.y)
.. variable:: Iconv_VERSION_MAJOR
.. versionadded:: 3.21
The major version of iconv
.. variable:: Iconv_VERSION_MINOR
.. versionadded:: 3.21
The minor version of iconv
.. variable:: Iconv_IS_BUILT_IN
A variable indicating whether iconv support is stemming from the
......@@ -51,6 +69,10 @@ The following cache variables may also be set:
On POSIX platforms, iconv might be part of the C library and the cache
variables ``Iconv_INCLUDE_DIR`` and ``Iconv_LIBRARY`` might be empty.
.. note::
Some libiconv implementations don't embed the version number in their header files.
In this case the variables ``Iconv_VERSION*`` will be empty.
#]=======================================================================]
include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
......@@ -118,9 +140,29 @@ find_library(Iconv_LIBRARY
mark_as_advanced(Iconv_INCLUDE_DIR)
mark_as_advanced(Iconv_LIBRARY)
# NOTE: glibc's iconv.h does not define _LIBICONV_VERSION
if(Iconv_INCLUDE_DIR AND NOT Iconv_IS_BUILT_IN)
file(STRINGS ${Iconv_INCLUDE_DIR}/iconv.h Iconv_VERSION_DEFINE REGEX "_LIBICONV_VERSION (.*)")
if(Iconv_VERSION_DEFINE MATCHES "(0x[A-Fa-f0-9]+)")
set(Iconv_VERSION_NUMBER "${CMAKE_MATCH_1}")
# encoding -> version number: (major<<8) + minor
math(EXPR Iconv_VERSION_MAJOR "${Iconv_VERSION_NUMBER} >> 8" OUTPUT_FORMAT HEXADECIMAL)
math(EXPR Iconv_VERSION_MINOR "${Iconv_VERSION_NUMBER} - (${Iconv_VERSION_MAJOR} << 8)" OUTPUT_FORMAT HEXADECIMAL)
math(EXPR Iconv_VERSION_MAJOR "${Iconv_VERSION_MAJOR}" OUTPUT_FORMAT DECIMAL)
math(EXPR Iconv_VERSION_MINOR "${Iconv_VERSION_MINOR}" OUTPUT_FORMAT DECIMAL)
set(Iconv_VERSION "${Iconv_VERSION_MAJOR}.${Iconv_VERSION_MINOR}")
endif()
unset(Iconv_VERSION_DEFINE)
unset(Iconv_VERSION_NUMBER)
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
if(NOT Iconv_IS_BUILT_IN)
find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY Iconv_INCLUDE_DIR)
find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY Iconv_INCLUDE_DIR
VERSION_VAR Iconv_VERSION)
else()
find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY)
endif()
......
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