On AIX 5.1 and likely also 5.2, I get these warnings
passfd.c: In function 'sendfd':
passfd.c:60: warning: implicit declaration of function 'CMSG_SPACE'
passfd.c:67: warning: implicit declaration of function 'CMSG_LEN'
and later on link errors because CMSG_SPACE and CMSG_LEN are not functions.
The reason is that <sys/socket.h> defines these two macros only if
_LINUX_SOURCE_COMPAT is defined. This fixes it:
2011-03-13 Bruno Haible <br...@clisp.org>
passfd: Fix link error on AIX 5.2.
* m4/afunix.m4 (gl_SOCKET_AFUNIX): Define _LINUX_SOURCE_COMPAT.
--- m4/afunix.m4.orig Sun Mar 13 23:59:07 2011
+++ m4/afunix.m4 Sun Mar 13 23:59:05 2011
@@ -1,4 +1,4 @@
-# afunix.m4 serial 4
+# afunix.m4 serial 5
dnl Copyright (C) 2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -38,6 +38,10 @@
[Define to 1 if <sys/socket.h> defines SCM_RIGHTS.])
fi
+ dnl Persuade AIX 5.2 <sys/socket.h> to declare CMSG_SPACE, CMSG_LEN.
+ AC_DEFINE([_LINUX_SOURCE_COMPAT], [1],
+ [Define in order to get some macros on AIX systems.])
+
AC_MSG_CHECKING([for UNIX domain sockets SCM_RIGHTS that behave in BSD4.4
way])
AC_CACHE_VAL([gl_cv_socket_unix_scm_rights_bsd44_way],
[AC_COMPILE_IFELSE(
--
In memoriam Odette Sansom <http://en.wikipedia.org/wiki/Odette_Hallowes>
