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dnl AC_C_DNS
dnl Checks resolv.h presence and usability
dnl Checks for specific lresolv exports
dnl Checks for lresolve reentrance
dnl
dnl Note using AC_LINK_IFELSE instead of AC_CHECK_LIB
dnl as symbols are often redefined in resolv.h
AC_DEFUN([AC_C_DNS], [
AC_ARG_ENABLE([dns],
AC_HELP_STRING([--disable-dns], [disable support for database verification through DNS]),
[want_dns=$enableval], [want_dns=yes]
)
if test $want_dns = yes; then |
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ac_cv_have_lresolv=no |
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AC_CHECK_HEADER([resolv.h],
[ |
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AC_CACHE_CHECK([for dn_expand in std libs], [ac_cv_have_lresolv_std], [
ac_cv_have_lresolv_std='no' |
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AC_LINK_IFELSE([AC_LANG_SOURCE([ |
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#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h> |
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int main() { return (long)dn_expand; } |
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])], |
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[
ac_cv_have_lresolv_std='yes'
ac_cv_have_lresolv=''
])
])
if test "x$ac_cv_have_lresolv" = "xno"; then
bklibs=$LIBS
LIBS=-lresolv
AC_CACHE_CHECK([for dn_expand in -lresolv], [ac_cv_have_lresolv_lresolv], [
ac_cv_have_lresolv_lresolv='yes' |
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AC_LINK_IFELSE([AC_LANG_SOURCE([ |
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#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h> |
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int main() { return (long)dn_expand; } |
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])], |
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[ |
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ac_cv_have_lresolv_lresolv='yes'
ac_cv_have_lresolv=' -lresolv' |
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])
])
LIBS=$bklibs; |
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fi |
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], |
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[ ac_cv_have_lresolv=no ], |
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[
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
]) |
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if test "x$ac_cv_have_lresolv" != "xno"; then
FRESHCLAM_LIBS="$FRESHCLAM_LIBS$ac_cv_have_lresolv" |
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AC_DEFINE([HAVE_RESOLV_H],1,[have resolv.h])
else
AC_MSG_WARN([****** DNS support disabled])
fi
fi
])
|