Protect use of dlopen() and dlsym() with HAVE_DLSYM and HAVE_DLFCN_H …

…for compatibility with cases where these functions aren’t available.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10349 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_Native_File_Chooser_FLTK.cxx

@@ -16,6 +16,7 @@
 //     http://www.fltk.org/str.php
 //
 
+#include <config.h>
 #include <FL/Fl_Native_File_Chooser.H>
 #include <FL/Fl_File_Icon.H>
 #define FLTK_CHOOSER_SINGLE    Fl_File_Chooser::SINGLE
@@ -50,9 +51,11 @@ Fl_Native_File_Chooser::Fl_Native_File_Chooser(int val) {
 #endif // FLTK_ABI_VERSION
   if (have_looked_for_GTK_libs == 0) {
     // First Time here, try to find the GTK libs if they are installed
+#if HAVE_DLSYM && HAVE_DLFCN_H
     if (Fl::option(Fl::OPTION_FNFC_USES_GTK)) {
       Fl_GTK_File_Chooser::probe_for_GTK_libs();
     }
+#endif
     have_looked_for_GTK_libs = -1;
   }
   // if we found all the GTK functions we need, we will use the GtkFileChooserDialog

src/Fl_Native_File_Chooser_GTK.cxx

@@ -17,7 +17,9 @@
 //
 
 #include <FL/x.H>
+#if HAVE_DLSYM && HAVE_DLFCN_H
 #include <dlfcn.h>   // for dlopen et al
+#endif
 #include <locale.h>  // for setlocale
 
 /* --------------------- Type definitions from GLIB and GTK --------------------- */
@@ -620,8 +622,9 @@ int Fl_GTK_File_Chooser::fl_gtk_chooser_wrapper()
   return result;
 } // fl_gtk_chooser_wrapper
 
+#if HAVE_DLSYM && HAVE_DLFCN_H
 // macro to help with the symbol loading boilerplate...
-#define GET_SYM(SSS, LLL) \
+#  define GET_SYM(SSS, LLL) \
 dlerror();    /* Clear any existing error */  \
 fl_##SSS = (XX_##SSS)dlsym(LLL, #SSS);        \
 if ((pc_dl_error = dlerror()) != NULL)  {     \
@@ -635,13 +638,15 @@ static void* fl_dlopen(const char *filename1, const char *filename2)
   if (!ptr) ptr = dlopen(filename2, RTLD_LAZY | RTLD_GLOBAL);
   return ptr;
 }
+#endif
 
 /* 
  * Use dlopen to see if we can load the gtk dynamic libraries that
  * will allow us to create a GtkFileChooserDialog() on the fly,
  * without linking to the GTK libs at compile time.
  */
 void Fl_GTK_File_Chooser::probe_for_GTK_libs(void) {
+#if HAVE_DLSYM && HAVE_DLFCN_H
   void *ptr_glib    = NULL;
   void *ptr_gtk     = NULL;
 
@@ -719,6 +724,7 @@ void Fl_GTK_File_Chooser::probe_for_GTK_libs(void) {
   GET_SYM(gtk_toggle_button_set_active, ptr_gtk);
 
   did_find_GTK_libs = 1;
+#endif
 } // probe_for_GTK_libs
 
 //