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