* Changed the way symbols are resolved. For each root image (program,

add-on) we create a breadth-first sorted image list and use that to
  search for symbols.
* Added support for preloading libraries. The environment variable
  LD_PRELOAD can contain a whitespace-separated list of shared objects
  that will be loaded before the program. This allows to replace
  symbols without changing the executable or libraries.
* Resolved TODO in load_program() regarding the order of remapping the
  images and initializing the dependencies (problem fixed in r28453).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28455 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/runtime_loader/runtime_loader.h

@@ -65,6 +65,11 @@ typedef struct image_t {
 	uint32				num_needed;
 	struct image_t		**needed;
 
+	// For "root" images (the program, add-ons): Symbols are searched in the
+	// images in array order.
+	uint32				symbol_resolution_image_count;
+	struct image_t		**symbol_resolution_images;
+
 	// describes the text and data regions
 	uint32				num_regions;
 	elf_region_t		regions[1];