📄 check-var.m4
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dnl $Id: check-var.m4,v 1.12 2005/06/16 18:59:10 lha Exp $dnldnl rk_CHECK_VAR(variable, includes)AC_DEFUN([rk_CHECK_VAR], [AC_MSG_CHECKING(for $1)AC_CACHE_VAL(ac_cv_var_$1, [m4_ifval([$2],[ AC_LINK_IFELSE([AC_LANG_PROGRAM([[$2 void * foo(void) { return &$1; }]],[[foo()]])], [ac_cv_var_$1=yes],[ac_cv_var_$1=no])])if test "$ac_cv_var_$1" != yes ; thenAC_LINK_IFELSE([AC_LANG_PROGRAM([[extern int $1;int foo(void) { return $1; }]],[[foo()]])], [ac_cv_var_$1=yes],[ac_cv_var_$1=no])fi])ac_foo=`eval echo \\$ac_cv_var_$1`AC_MSG_RESULT($ac_foo)if test "$ac_foo" = yes; then AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_[]$1), 1, [Define if you have the `]$1[' variable.]) m4_ifval([$2], AC_CHECK_DECLS([$1],[],[],[$2]))fi])AU_DEFUN([AC_CHECK_VAR], [rk_CHECK_VAR([$2], [$1])], [foo])
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