configure: Add -ldl to default libs if necessary.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

configure

@@ -629,7 +629,6 @@ LDAP_LIBS
 LDAP_CFLAGS
 RT_LIBS
 POLL_LIBS
-DL_LIBS
 TOOLSEXT
 MSVCRTFLAGS
 EXCESS_PRECISION_CFLAGS
@@ -17789,7 +17788,6 @@ for ac_func in \
         __res_get_state \
         __res_getservers \
 	_spawnvp \
-	dlopen \
 	epoll_create \
 	ffs \
 	finitef \
@@ -17847,15 +17845,12 @@ done
 
 CFLAGS="$ac_save_CFLAGS"
 
-if test "$ac_cv_func_dlopen" = no
-then
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
-$as_echo_n "checking for dlopen in -ldl... " >&6; }
-if ${ac_cv_lib_dl_dlopen+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5
+$as_echo_n "checking for library containing dlopen... " >&6; }
+if ${ac_cv_search_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-ldl  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -17874,24 +17869,38 @@ return dlopen ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_dl_dlopen=yes
-else
-  ac_cv_lib_dl_dlopen=no
+for ac_lib in '' dl; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_dlopen=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_dlopen+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
-$as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
-  $as_echo "#define HAVE_DLOPEN 1" >>confdefs.h
- DL_LIBS="-ldl"
+done
+if ${ac_cv_search_dlopen+:} false; then :
+
+else
+  ac_cv_search_dlopen=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_dlopen" >&5
+$as_echo "$ac_cv_search_dlopen" >&6; }
+ac_res=$ac_cv_search_dlopen
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 fi
 
-fi
 ac_wine_check_funcs_save_LIBS="$LIBS"
 LIBS="$LIBS $DL_LIBS"
 for ac_func in dladdr
@@ -20006,7 +20015,6 @@ NETAPI_LIBS = $NETAPI_LIBS
 VKD3D_CFLAGS = $VKD3D_CFLAGS
 VKD3D_LIBS = $VKD3D_LIBS
 EXCESS_PRECISION_CFLAGS = $EXCESS_PRECISION_CFLAGS
-DL_LIBS = $DL_LIBS
 POLL_LIBS = $POLL_LIBS
 RT_LIBS = $RT_LIBS
 LDAP_CFLAGS = $LDAP_CFLAGS

configure.ac

@@ -2132,7 +2132,6 @@ AC_CHECK_FUNCS(\
         __res_get_state \
         __res_getservers \
 	_spawnvp \
-	dlopen \
 	epoll_create \
 	ffs \
 	finitef \
@@ -2180,10 +2179,7 @@ AC_CHECK_FUNCS(\
 CFLAGS="$ac_save_CFLAGS"
 
 dnl Check for -ldl
-if test "$ac_cv_func_dlopen" = no
-then
-    AC_CHECK_LIB(dl,dlopen,[AC_DEFINE(HAVE_DLOPEN,1) AC_SUBST(DL_LIBS,"-ldl")])
-fi
+AC_SEARCH_LIBS(dlopen, dl)
 WINE_CHECK_LIB_FUNCS(dladdr,[$DL_LIBS])
 
 dnl Check for -lpoll for Mac OS X/Darwin

include/config.h.in

@@ -110,9 +110,6 @@
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
-/* Define to 1 if you have the `dlopen' function. */
-#undef HAVE_DLOPEN
-
 /* Define to 1 if you have the <EGL/egl.h> header file. */
 #undef HAVE_EGL_EGL_H
 

include/wine/port.h

@@ -55,6 +55,11 @@
 
 #define mkdir(path,mode) mkdir(path)
 
+static inline void *dlopen(const char *name, int flags) { return NULL; }
+static inline void *dlsym(void *handle, const char *name) { return NULL; }
+static inline int dlclose(void *handle) { return 0; }
+static inline const char *dlerror(void) { return "No dlopen support on Windows"; }
+
 #ifdef _MSC_VER
 
 #define ftruncate chsize

libs/wine/Makefile.in

@@ -1,4 +1,4 @@
-EXTRALIBS = $(DL_LIBS) $(COREFOUNDATION_LIBS) $(CORESERVICES_LIBS) $(I386_LIBS)
+EXTRALIBS = $(COREFOUNDATION_LIBS) $(CORESERVICES_LIBS) $(I386_LIBS)
 
 C_SRCS = \
 	c_037.c \