Assume dlerror() function is always available when dlopen() is

Remove separate checks for dlerror() which don't seem to be needed under
any platform any longer.

No real changes, just slim down configure/CMake a tiny bit.

build/cmake/setup.cmake

@@ -614,7 +614,6 @@ set(CMAKE_REQUIRED_LIBRARIES dl)
 check_symbol_exists(dlopen dlfcn.h HAVE_DLOPEN)
 cmake_pop_check_state()
 if(HAVE_DLOPEN)
-    check_symbol_exists(dlerror dlfcn.h HAVE_DLERROR)
     check_symbol_exists(dladdr dlfcn.h HAVE_DLADDR)
 endif()
 check_function_exists(gettimeofday HAVE_GETTIMEOFDAY)

build/cmake/setup.h.in

@@ -1086,9 +1086,6 @@
 /* Define if wchar_t is distinct type in your compiler. */
 #cmakedefine wxWCHAR_T_IS_REAL_TYPE 1
 
-/* Define if you have the dlerror function.  */
-#cmakedefine HAVE_DLERROR 1
-
 /* Define if you have the dladdr function.  */
 #cmakedefine HAVE_DLADDR 1
 

configure

@@ -32744,63 +32744,6 @@ done
 
 
                         if test "$HAVE_DL_FUNCS" = 1; then
-                for ac_func in dlerror
-do :
-  ac_fn_c_check_func "$LINENO" "dlerror" "ac_cv_func_dlerror"
-if test "x$ac_cv_func_dlerror" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_DLERROR 1
-_ACEOF
- $as_echo "#define HAVE_DLERROR 1" >>confdefs.h
-
-else
-
-                        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlerror in -ldl" >&5
-$as_echo_n "checking for dlerror in -ldl... " >&6; }
-if ${ac_cv_lib_dl_dlerror+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-ldl  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char dlerror ();
-int
-main ()
-{
-return dlerror ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_dl_dlerror=yes
-else
-  ac_cv_lib_dl_dlerror=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlerror" >&5
-$as_echo "$ac_cv_lib_dl_dlerror" >&6; }
-if test "x$ac_cv_lib_dl_dlerror" = xyes; then :
-  $as_echo "#define HAVE_DLERROR 1" >>confdefs.h
-
-fi
-
-
-
-fi
-done
-
                 for ac_func in dladdr
 do :
   ac_fn_c_check_func "$LINENO" "dladdr" "ac_cv_func_dladdr"

configure.in

@@ -5390,12 +5390,6 @@ if test "$TOOLKIT" != "MSW"; then
 
             dnl check also for dlerror()
             if test "$HAVE_DL_FUNCS" = 1; then
-                AC_CHECK_FUNCS(dlerror,
-                    AC_DEFINE(HAVE_DLERROR),
-                    [
-                        AC_CHECK_LIB(dl, dlerror, AC_DEFINE(HAVE_DLERROR))
-                    ]
-                )
                 AC_CHECK_FUNCS(dladdr,
                     AC_DEFINE(HAVE_DLADDR),
                     [

include/wx/osx/config_xcode.h

@@ -87,7 +87,6 @@
 #define SIZEOF_LONG_LONG 8
 #define wxSIZE_T_IS_ULONG 1
 #define wxWCHAR_T_IS_REAL_TYPE 1
-#define HAVE_DLERROR 1
 #define HAVE_FCNTL 1
 #define HAVE_GETHOSTBYNAME 1
 #define HAVE_GETSERVBYNAME 1

setup.h.in

@@ -1086,9 +1086,6 @@
 /* Define if wchar_t is distinct type in your compiler. */
 #undef wxWCHAR_T_IS_REAL_TYPE
 
-/* Define if you have the dlerror function.  */
-#undef HAVE_DLERROR
-
 /* Define if you have the dladdr function.  */
 #undef HAVE_DLADDR
 

setup.h_vms

@@ -1194,9 +1194,6 @@ typedef pid_t GPid;
 /* Define if wchar_t is distinct type in your compiler. */
 #define wxWCHAR_T_IS_REAL_TYPE 1
 
-/* Define if you have the dlerror function.  */
-#define HAVE_DLERROR 1
-
 /* Define if you have the dladdr function.  */
 #undef HAVE_DLADDR