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+dnl RA_FLUSHLEFT -- remove all whitespace at the beginning of lines
+dnl This is useful for c-code which may include cpp statements
+dnl
+define([RA_FLUSHLEFT],
+ [changequote(`,')dnl
+patsubst(`$1', `^[ ]+')
+changequote([,])])dnl
+
+dnl RA_RESULT_ACTIONS -- generate shell code for the result of a test
+dnl $1 -- CVAR -- cache variable to check
+dnl $2 -- NAME -- if not empty, used to generate a default value TRUE:
+dnl `AC_DEFINE(HAVE_NAME)'
+dnl $2 -- TRUE -- what to do if the CVAR is not `no'
+dnl $3 -- FALSE -- what to do otherwise; defaults to `:'
+dnl
+AC_DEFUN([RA_RESULT_ACTIONS], [
+[if test "$$1" != "" -a "$$1" != no; then
+ ]ifelse([$3], ,
+ [AC_DEFINE(HAVE_]translit($2, [a-z ./<>], [A-Z___])[,1,[FIXME])],
+ [$3])[
+else
+ ]ifelse([$4], , [:], [$4])[
+fi]])dnl
+
+dnl RA_CHECK_STRUCT_FIELD -- See if a structure has a particular field
+dnl $1 - NAME -- name of structure
+dnl $2 - FIELD -- name of field to test
+dnl $3 - INCLS -- C program text to inculde necessary files for testing
+dnl $4 - TRUE -- what to do if struct NAME has FIELD; defaults to
+dnl `AC_DEFINE(HAVE_NAME_FIELD)'
+dnl $5 - FALSE -- what to do if not; defaults to `:'
+dnl
+dnl NOTE: We still don't use AC_CHECK_MEMBERS, since it has (as of
+dnl autoconf 2.53) a bug which prevents it from recognizing members
+dnl of aggregate type.
+
+AC_DEFUN([RA_CHECK_STRUCT_FIELD], [
+ define([ra_CVAR], [ra_cv_struct_]translit($1_$2, [A-Z], [a-z]))dnl
+ AC_CACHE_CHECK([whether struct $1 has $2 field], ra_CVAR,
+ AC_TRY_COMPILE(RA_FLUSHLEFT([$3]),
+ [struct $1 ra_x; int ra_y = sizeof ra_x.$2;],
+ ra_CVAR[=yes], ra_CVAR[=no]))
+ RA_RESULT_ACTIONS(ra_CVAR, [$1_$2], [$4], [$5])dnl
+ undefine([ra_CVAR])])dnl
+

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