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5.8.2 Generic Structure Checks
These macros are used to find structure members not covered by the “particular” test macros.
- Macro: AC_CHECK_MEMBER (aggregate.member, [action-if-found] @ovar{action-if-not-found}, [includes = ‘AC_INCLUDES_DEFAULT’]
-
Check whether member is a member of the aggregate aggregate. If no includes are specified, the default includes are used (see section 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.
- Macro: AC_CHECK_MEMBERS (members, [action-if-found] [action-if-not-found] @dvar{includes, AC_INCLUDES_DEFAULT})
-
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 section 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])
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