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FindIconv: Avoid explicitly finding C runtime library

Browse Source 
If `iconv` functionality is built into the C runtime library,
we do not need to link any libraries.  Do not find `libc`.

Fixes: #22114
This commit is contained in:
Brad King
2021-04-26 13:00:37 -04:00
parent 8b30e7adfb
commit 404025b00c
1 changed files with 27 additions and 23 deletions
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50
Modules/FindIconv.cmake
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@@ -122,26 +122,28 @@ if(NOT DEFINED Iconv_IS_BUILT_IN)
endif()
endif()
if(NOT Iconv_IS_BUILT_IN)
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")
else()
set(Iconv_INCLUDE_DIR "" CACHE FILEPATH "iconv include directory")
set(Iconv_LIBRARY_NAMES "c")
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()
find_library(Iconv_LIBRARY
NAMES ${Iconv_LIBRARY_NAMES}
NAMES_PER_DIR
DOC "iconv library (potentially the C library)")
mark_as_advanced(Iconv_INCLUDE_DIR)
mark_as_advanced(Iconv_LIBRARY)
# NOTE: glibc's iconv.h does not define _LIBICONV_VERSION
if(Iconv_INCLUDE_DIR AND NOT Iconv_IS_BUILT_IN)
if(Iconv_INCLUDE_DIR AND EXISTS "${Iconv_INCLUDE_DIR}/iconv.h")
file(STRINGS ${Iconv_INCLUDE_DIR}/iconv.h Iconv_VERSION_DEFINE REGEX "_LIBICONV_VERSION (.*)")
if(Iconv_VERSION_DEFINE MATCHES "(0x[A-Fa-f0-9]+)")
@@ -160,19 +162,21 @@ if(Iconv_INCLUDE_DIR AND NOT Iconv_IS_BUILT_IN)
endif()
include(${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
VERSION_VAR Iconv_VERSION)
else()
find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY)
endif()
find_package_handle_standard_args(Iconv
REQUIRED_VARS ${_Iconv_REQUIRED_VARS}
VERSION_VAR Iconv_VERSION)
if(Iconv_FOUND)
set(Iconv_INCLUDE_DIRS "${Iconv_INCLUDE_DIR}")
set(Iconv_LIBRARIES "${Iconv_LIBRARY}")
if(Iconv_IS_BUILT_IN)
set(Iconv_INCLUDE_DIRS "")
set(Iconv_LIBRARIES "")
else()
set(Iconv_INCLUDE_DIRS "${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 "${Iconv_LIBRARIES}")
endif()
set_property(TARGET Iconv::Iconv PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${Iconv_INCLUDE_DIRS}")
set_property(TARGET Iconv::Iconv PROPERTY INTERFACE_LINK_LIBRARIES "${Iconv_LIBRARIES}")
endif()