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AC_CHECK_DEFINE([symbol], [ACTION-IF-FOUND],
[ACTION-IF-NOT])
AX_CHECK_DEFINE([includes],[symbol], [ACTION-IF-FOUND],
[ACTION-IF-NOT])
complements AC_CHECK_FUNC but it does not check for a function but for a define to exist. Consider a usage like AC_CHECK_DEFINE(__STRICT_ANSI__, CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500")
Guido Draheim <guidod@gmx.de>
2005-01-22
AC_DEFUN([AC_CHECK_DEFINED],[ AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1])dnl AC_CACHE_CHECK([for $1 defined], ac_var, AC_TRY_COMPILE(,[ #ifdef $1 int ok; #else choke me #endif ],AS_VAR_SET(ac_var, yes),AS_VAR_SET(ac_var, no))) AS_IF([test AS_VAR_GET(ac_var) != "no"], [$2], [$3])dnl AS_VAR_POPDEF([ac_var])dnl ]) AC_DEFUN([AX_CHECK_DEFINED],[ AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$2])dnl AC_CACHE_CHECK([for $1 defined], ac_var, AC_TRY_COMPILE($1,[ #ifndef $2 int ok; #else choke me #endif ],AS_VAR_SET(ac_var, yes),AS_VAR_SET(ac_var, no))) AS_IF([test AS_VAR_GET(ac_var) != "no"], [$3], [$4])dnl AS_VAR_POPDEF([ac_var])dnl ]) AC_DEFUN([AX_CHECK_FUNC], [AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$2])dnl AC_CACHE_CHECK([for $2], ac_var, dnl AC_LANG_FUNC_LINK_TRY [AC_LINK_IFELSE([AC_LANG_PROGRAM([$1 #undef $2 char $2 ();],[ char (*f) () = $2; return f != $2; ])], [AS_VAR_SET(ac_var, yes)], [AS_VAR_SET(ac_var, no)])]) AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl AS_VAR_POPDEF([ac_var])dnl ])# AC_CHECK_FUNC