(autoconf.info)Generic Structures


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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],
          [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 (*note
     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)

 -- Macro: AC_CHECK_MEMBERS (MEMBERS, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [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' (Note: 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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