libltdl/argz.h, libltdl/lt__glibc.h, libltdl/lt_dlloader.h,
libltdl/lt__dirent.c, libltdl/lt__dirent.h, libltdl/lt__private.h,
libltdl/lt__alloc.c, libltdl/lt__alloc.h, libltdl/lt_system.h,
libltdl/loader-dld_link.c, libltdl/loader-dlopen.c,
libltdl/loader-dyld.c, libltdl/loader-loadlibrary.c,
libltdl/loader-shl_load.c, libltdl/lt_error.h, libltdl/lt_mutex.h:
Autoconf either defines to 1 or undefs the discovery macros it
puts in config.h, and many (non-GNU) compilers throw a spurious
warning when testing an #undef macro with #if. For consistency,
while we are touching all these lines, use defined(MACRO) style
throughout.
Reported by Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
from here...
* libltdl/lt__private.h: ...to here. New file to declare ltdl's
internal interfaces.
* libltdl/ltdl.c: Include lt__private.h.
* m4/ltdl.m4 (AC_LIB_LTDL): Add lt_dirent to AC_LIBOBJ if all of
opendir, readdir and closedir are missing.
(AC_CHECK_HEADERS): Remove assert.h, ctype.h, errno.h, malloc.h,
stdio.h and stdlib.h; these headers are all available in standard
c89 environments and newer.
* libltdl/lt__private.h: Include them here unconditionally.
* libltdl/lt__dirent.c (opendir, readdir, closedir): New file.
Windows dirent emulation functions moved to here...
* libltdl/ltdl.c (opendir, readdir, closedir): ...from here.
* libltdl/lt__dirent.h: New file. Rename the global symbols from
lt__dirent.c into the lt__ namespace so they don't clash with
other libraries.
