Q: How to #ifdef for dlopen() or a specific OS Version
For a patch to fix the AIX port I would like to differentiate
Versions below 4.3 and above, or rather I would like to
differentiate whether -ldl has dlopen().
A compiler define would be _AIX43, but I guess we are supposed to
use a define from configure.
Thanks
Andreas
Zeugswetter Andreas SB <ZeugswetterA@wien.spardat.at> writes:
For a patch to fix the AIX port I would like to differentiate
Versions below 4.3 and above, or rather I would like to
differentiate whether -ldl has dlopen().
Checking the latter condition seems more robust.
It's not hard. After configure.in's line
AC_CHECK_LIB(dl, main)
you could add something like
AC_CHECK_LIB(dl, dlopen, [AC_DEFINE(HAVE_DLOPEN_IN_LIBDL)])
and make the corresponding addition to config.h.in and/or
Makefile.global.in, depending on whether you need access to this symbol
from C code, Makefiles, or both.
regards, tom lane