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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindIconv
---------
.. versionadded:: 3.11
This module finds the ``iconv()`` POSIX.1 functions on the system.
These functions might be provided in the regular C library or externally
in the form of an additional library.
The following variables are provided to indicate iconv support:
.. variable:: Iconv_FOUND
Variable indicating if the iconv support was found.
.. variable:: Iconv_INCLUDE_DIRS
The directories containing the iconv headers.
.. variable:: Iconv_LIBRARIES
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
C library or not. Even if the C library provides `iconv()`, the presence of
an external `libiconv` implementation might lead to this being false.
Additionally, the following :prop_tgt:`IMPORTED` target is being provided:
.. variable:: Iconv::Iconv
Imported target for using iconv.
The following cache variables may also be set:
.. variable:: Iconv_INCLUDE_DIR
The directory containing the iconv headers.
.. variable:: Iconv_LIBRARY
The iconv library (if not implicitly given in the C library).
.. note::
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(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
if(CMAKE_C_COMPILER_LOADED)
include(${CMAKE_CURRENT_LIST_DIR}/CheckCSourceCompiles.cmake)
elseif(CMAKE_CXX_COMPILER_LOADED)
include(${CMAKE_CURRENT_LIST_DIR}/CheckCXXSourceCompiles.cmake)
else()
# If neither C nor CXX are loaded, implicit iconv makes no sense.
set(Iconv_IS_BUILT_IN FALSE)
endif()
# iconv can only be provided in libc on a POSIX system.
# If any cache variable is already set, we'll skip this test.
if(NOT DEFINED Iconv_IS_BUILT_IN)
if(UNIX AND NOT DEFINED Iconv_INCLUDE_DIR AND NOT DEFINED Iconv_LIBRARY)
cmake_push_check_state(RESET)
# We always suppress the message here: Otherwise on supported systems
# not having iconv in their C library (e.g. those using libiconv)
# would always display a confusing "Looking for iconv - not found" message
set(CMAKE_FIND_QUIETLY TRUE)
# The following code will not work, but it's sufficient to see if it compiles.
# Note: libiconv will define the iconv functions as macros, so CheckSymbolExists
# will not yield correct results.
set(Iconv_IMPLICIT_TEST_CODE
"
#include <stddef.h>
#include <iconv.h>
int main() {
char *a, *b;
size_t i, j;
iconv_t ic;
ic = iconv_open(\"to\", \"from\");
iconv(ic, &a, &i, &b, &j);
iconv_close(ic);
}
"
)
if(CMAKE_C_COMPILER_LOADED)
check_c_source_compiles("${Iconv_IMPLICIT_TEST_CODE}" Iconv_IS_BUILT_IN)
else()
check_cxx_source_compiles("${Iconv_IMPLICIT_TEST_CODE}" Iconv_IS_BUILT_IN)
endif()
cmake_pop_check_state()
else()
set(Iconv_IS_BUILT_IN FALSE)
endif()
endif()
set(_Iconv_REQUIRED_VARS)
if(Iconv_IS_BUILT_IN)
set(_Iconv_REQUIRED_VARS _Iconv_IS_BUILT_IN_MSG)
set(_Iconv_IS_BUILT_IN_MSG "built in to C library")
else()
set(_Iconv_REQUIRED_VARS Iconv_LIBRARY Iconv_INCLUDE_DIR)
find_path(Iconv_INCLUDE_DIR
NAMES "iconv.h"
DOC "iconv include directory")
set(Iconv_LIBRARY_NAMES "iconv" "libiconv")
mark_as_advanced(Iconv_INCLUDE_DIR)
find_library(Iconv_LIBRARY
NAMES iconv libiconv
NAMES_PER_DIR
DOC "iconv library (if not in the C library)")
mark_as_advanced(Iconv_LIBRARY)
endif()
# NOTE: glibc's iconv.h does not define _LIBICONV_VERSION
if(Iconv_INCLUDE_DIR AND EXISTS "${Iconv_INCLUDE_DIR}/iconv.h")
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)
find_package_handle_standard_args(Iconv
REQUIRED_VARS ${_Iconv_REQUIRED_VARS}
VERSION_VAR Iconv_VERSION)
if(Iconv_FOUND)
if(Iconv_IS_BUILT_IN)
set(Iconv_INCLUDE_DIRS "")
set(Iconv_LIBRARIES "")
else()
set(Iconv_INCLUDE_DIRS "${Iconv_INCLUDE_DIR}")
set(Iconv_LIBRARIES "${Iconv_LIBRARY}")
endif()
if(NOT TARGET Iconv::Iconv)
add_library(Iconv::Iconv INTERFACE IMPORTED)
set_property(TARGET Iconv::Iconv PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${Iconv_INCLUDE_DIRS}")
set_property(TARGET Iconv::Iconv PROPERTY INTERFACE_LINK_LIBRARIES "${Iconv_LIBRARIES}")
endif()
endif()