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[FreeBSD/releng/9.2.git] / crypto / heimdal / cf / have-struct-field.m4
1 dnl $Id: have-struct-field.m4 18314 2006-10-07 17:31:56Z lha $
2 dnl
3 dnl check for fields in a structure
4 dnl
5 dnl AC_HAVE_STRUCT_FIELD(struct, field, headers)
6
7 AC_DEFUN([AC_HAVE_STRUCT_FIELD], [
8 define(cache_val, translit(ac_cv_type_$1_$2, [A-Z ], [a-z_]))
9 AC_CACHE_CHECK([for $2 in $1], cache_val,[
10 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$3]],
11         [[$1 x; memset(&x, 0, sizeof(x)); x.$2]])],
12         [cache_val=yes],
13         [cache_val=no])
14 ])
15 if test "$cache_val" = yes; then
16         define(foo, translit(HAVE_$1_$2, [a-z ], [A-Z_]))
17         AC_DEFINE(foo, 1, [Define if $1 has field $2.])
18         undefine([foo])
19 fi
20 undefine([cache_val])
21 ])