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
_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
_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])