* defs.h (OPF_TRY_CWD_FIRST, OPF_SEARCH_IN_PATH): New macros.
* exec.c (exec_file_attach):
* nto-tdep.c (nto_find_and_open_solib):
* pa64solib.c (pa64_solib_sizeof_symbol_table):
* solib.c (solib_open):
* somsolib.c (som_solib_sizeof_symbol_table):
* source.c (is_regular_file, openp, open_source_file):
* symfile.c (symfile_bfd_open):
* wince.c (upload_to_device): Differentiate between the search for
binary and source files.
* gdb.texinfo (Source Path): Document the new behavior of
searching for the source files.