30 lines
778 B
Plaintext
30 lines
778 B
Plaintext
dnl $Id: check-var.m4,v 1.7 2003/02/17 00:44:57 lha Exp $
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dnl
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dnl rk_CHECK_VAR(variable, includes)
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AC_DEFUN([rk_CHECK_VAR], [
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AC_MSG_CHECKING(for $1)
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AC_CACHE_VAL(ac_cv_var_$1, [
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m4_ifval([$2],[
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AC_TRY_LINK([$2
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void * foo() { return &$1; }],
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[foo()],
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ac_cv_var_$1=yes, ac_cv_var_$1=no)])
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if test "$ac_cv_var_$1" != yes ; then
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AC_TRY_LINK([extern int $1;
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int foo() { return $1; }],
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[foo()],
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ac_cv_var_$1=yes, ac_cv_var_$1=no)
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fi
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])
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ac_foo=`eval echo \\$ac_cv_var_$1`
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AC_MSG_RESULT($ac_foo)
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if test "$ac_foo" = yes; then
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AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_[]$1), 1,
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[Define if you have the `]$1[' variable.])
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m4_ifval([$2], AC_CHECK_DECLARATION([$2],[$1]))
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fi
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])
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AC_WARNING_ENABLE([obsolete])
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AU_DEFUN([AC_CHECK_VAR], [rk_CHECK_VAR([$2], [$1])], [foo])
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