CMake: Improve finding Iconv

Continue when Iconv can not be found.
Silence warnings when testing if second argument for iconv() is const.
Use correct include dir.

build/cmake/init.cmake

@@ -154,7 +154,8 @@ if(wxUSE_LIBLZMA)
     find_package(LibLZMA REQUIRED)
 endif()
 
-if(UNIX AND wxUSE_SECRETSTORE)
+if(UNIX)
+    if(wxUSE_SECRETSTORE)
         # The required APIs are always available under MSW and OS X but we must
         # have GNOME libsecret under Unix to be able to compile this class.
         find_package(Libsecret REQUIRED)
@@ -164,6 +165,15 @@ if(UNIX AND wxUSE_SECRETSTORE)
         endif()
     endif()
 
+    if(wxUSE_LIBICONV)
+        find_package(Iconv)
+        if(NOT ICONV_FOUND)
+            message(WARNING "iconv not found")
+            wx_option_force_value(wxUSE_LIBICONV OFF)
+        endif()
+    endif()
+endif(UNIX)
+
 if(wxUSE_GUI)
     if(WXMSW AND wxUSE_METAFILE)
         # this one should probably be made separately configurable

build/cmake/lib/base/CMakeLists.txt

@@ -48,8 +48,8 @@ if(UNIX AND wxUSE_SECRETSTORE)
     wx_lib_include_directories(base PRIVATE ${LIBSECRET_INCLUDE_DIRS})
     wx_lib_link_libraries(base PRIVATE ${LIBSECRET_LIBRARIES})
 endif()
-if(wxUSE_LIBICONV AND ICONV_FOUND)
-    wx_lib_include_directories(base PRIVATE ${ICONV_INCLUDE_DIRS})
+if(wxUSE_LIBICONV)
+    wx_lib_include_directories(base PRIVATE ${ICONV_INCLUDE_DIR})
     wx_lib_link_libraries(base PRIVATE ${ICONV_LIBRARIES})
 endif()
 if(wxUSE_THREADS AND CMAKE_THREAD_LIBS_INIT)

build/cmake/modules/FindIconv.cmake

@@ -25,6 +25,7 @@ ENDIF(ICONV_INCLUDE_DIR AND ICONV_LIBRARIES)
 
 set(CMAKE_REQUIRED_INCLUDES ${ICONV_INCLUDE_DIR})
 set(CMAKE_REQUIRED_LIBRARIES ${ICONV_LIBRARIES})
+set(CMAKE_REQUIRED_QUIET ON)
 IF(ICONV_FOUND)
   check_cxx_source_compiles("
   #include <iconv.h>
@@ -41,6 +42,7 @@ IF(ICONV_FOUND)
 ENDIF(ICONV_FOUND)
 set(CMAKE_REQUIRED_INCLUDES)
 set(CMAKE_REQUIRED_LIBRARIES)
+set(CMAKE_REQUIRED_QUIET)
 
 IF(ICONV_FOUND)
   IF(NOT ICONV_FIND_QUIETLY)

build/cmake/setup.cmake

@@ -217,9 +217,8 @@ macro(wx_get_socket_param_type name code)
 endmacro()
 
 # the following tests are for Unix(like) systems only
-if(NOT WIN32)
-    if(wxUSE_LIBICONV AND NOT APPLE)
-        find_package(Iconv REQUIRED)
+if(UNIX)
+    if(wxUSE_LIBICONV)
         set(HAVE_ICONV ON)
         set(ICONV_CONST " ")
         if(ICONV_SECOND_ARGUMENT_IS_CONST)
@@ -419,8 +418,8 @@ if(NOT WIN32)
         check_symbol_exists(getservbyname netdb.h HAVE_GETSERVBYNAME)
         check_symbol_exists(inet_aton arpa/inet.h HAVE_INET_ATON)
         check_symbol_exists(inet_addr arpa/inet.h HAVE_INET_ADDR)
-    endif() # wxUSE_SOCKETS
-endif() # NOT WIN32
+    endif(wxUSE_SOCKETS)
+endif(UNIX)
 
 if(CMAKE_USE_PTHREADS_INIT)
     cmake_push_check_state(RESET)