Add checks for termcap if needed by readline

cmake/FindReadline.cmake

@@ -36,14 +36,18 @@ find_library(Readline_LIBRARY
     NO_DEFAULT_PATH
 )
 
-if(Readline_INCLUDE_DIR AND Readline_LIBRARY AND Ncurses_LIBRARY)
+find_library(Termcap_LIBRARY
+  NAMES tinfo termcap ncursesw ncurses cursesw curses
+)
+
+if(Readline_INCLUDE_DIR AND Readline_LIBRARY)
   set(READLINE_FOUND TRUE)
-else(Readline_INCLUDE_DIR AND Readline_LIBRARY AND Ncurses_LIBRARY)
+else(Readline_INCLUDE_DIR AND Readline_LIBRARY)
   FIND_LIBRARY(Readline_LIBRARY NAMES readline PATHS Readline_ROOT_DIR)
   include(FindPackageHandleStandardArgs)
   FIND_PACKAGE_HANDLE_STANDARD_ARGS(Readline DEFAULT_MSG Readline_INCLUDE_DIR Readline_LIBRARY )
   MARK_AS_ADVANCED(Readline_INCLUDE_DIR Readline_LIBRARY)
-endif(Readline_INCLUDE_DIR AND Readline_LIBRARY AND Ncurses_LIBRARY)
+endif(Readline_INCLUDE_DIR AND Readline_LIBRARY)
 
 mark_as_advanced(
     Readline_ROOT_DIR
@@ -53,22 +57,25 @@ mark_as_advanced(
 
 set(CMAKE_REQUIRED_INCLUDES ${Readline_INCLUDE_DIR})
 set(CMAKE_REQUIRED_LIBRARIES ${Readline_LIBRARY})
-INCLUDE(CheckCXXSourceCompiles) 
-CHECK_CXX_SOURCE_COMPILES(
-"
-#include <stdio.h>
-#include <readline/readline.h>
-int
-main()
-{
-  char * s  = rl_copy_text(0, 0);
-}
-" GNU_READLINE_FOUND)
 
-if(NOT Readline_LIBRARY)
-  set(Readline_LIBRARY "")
-endif()
+include(CheckFunctionExists)
+check_function_exists(rl_copy_text HAVE_COPY_TEXT)
+check_function_exists(rl_filename_completion_function HAVE_COMPLETION_FUNCTION)
+
+if(NOT HAVE_COMPLETION_FUNCTION)
+  unset(READLINE_FOUND)
+  set(CMAKE_REQUIRED_LIBRARIES ${Readline_LIBRARY} ${Termcap_LIBRARY})
+  check_function_exists(rl_copy_text HAVE_COPY_TEXT_TC)
+  check_function_exists(rl_filename_completion_function HAVE_COMPLETION_FUNCTION_TC)
+  set(HAVE_COMPLETION_FUNCTION ${HAVE_COMPLETION_FUNCTION_TC})
+  set(HAVE_COPY_TEXT ${HAVE_COPY_TEXT_TC})
+  if(HAVE_COMPLETION_FUNCTION)
+    set(Readline_LIBRARY ${Readline_LIBRARY} ${Termcap_LIBRARY})
+  endif(HAVE_COMPLETION_FUNCTION)
+endif(NOT HAVE_COMPLETION_FUNCTION)
+
+if(HAVE_COMPLETION_FUNCTION AND HAVE_COPY_TEXT)
+  set(GNU_READLINE_FOUND TRUE)
+  set(READLINE_FOUND TRUE)
+endif(HAVE_COMPLETION_FUNCTION AND HAVE_COPY_TEXT)
 
-if(Readline_LIBRARY AND OPENBSD)
-  list(APPEND EXTRA_LIBRARIES curses)
-endif()