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add a check if the variable is avaible when we include the headerfiles

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@11650 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2003-02-17 00:44:57 +00:00
parent cfd543b5ef
commit 47a6f05ed8
1 changed files with 8 additions and 1 deletions
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7
cf/check-var.m4
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@@ -4,10 +4,17 @@ dnl 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_TRY_LINK([$2
void * foo() { return &$1; }],
[foo()],
ac_cv_var_$1=yes, ac_cv_var_$1=no)])
if test "$ac_cv_var_$1" != yes ; then
AC_TRY_LINK([extern int $1;
int foo() { 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)