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These macros are used to find structure members not covered by the “particular” test macros.
Check whether member is a member of the aggregate aggregate. If no includes are specified, the default includes are used (see Default Includes).
AC_CHECK_MEMBER([struct passwd.pw_gecos], [],
[AC_MSG_ERROR([we need 'passwd.pw_gecos'])],
[[#include <pwd.h>]])
You can use this macro for submembers:
AC_CHECK_MEMBER(struct top.middle.bot)
This macro caches its result in the
ac_cv_member_aggregate_member variable, with
characters not suitable for a variable name mapped to underscores.
Check for the existence of each ‘aggregate.member’ of
members using the previous macro. When member belongs to
aggregate, define HAVE_aggregate_member (in all
capitals, with spaces and dots replaced by underscores). If
action-if-found is given, it is executed for each of the found
members. If action-if-not-found is given, it is executed for each
of the members that could not be found.
includes is a series of include directives, defaulting to
AC_INCLUDES_DEFAULT (see Default Includes), which are used
prior to the members under test.
This macro uses M4 lists:
AC_CHECK_MEMBERS([struct stat.st_rdev, struct stat.st_blksize])