Fix automagic support of dbi, pcap and sqlite3

ulogd has automagic deps for several output plugins right now, namely dbi,
pcap and sqlite3. These plugins are built if the appropriate libs are present
on user's system. While this situation is fine with binary distros it is not OK
on source-based ones such as Gentoo.

The problem arises when such a program links against libs without user's
request and libs are later removed from system which leaves program in a
broken state.

This patch is modifying configure.ac which we apply in our package and which
fixes mentioned issue. It adds 3 new configure options: --
without-{dbi,pcap.sqlite}. I would like to emphasize that this patch doesn't
change default behaviour of configure script at all, so all other distros won't
suffer. We simply add options to explicitly disable any attempts to try and
detect libs for automagic deps, which is enough to avoid unnecessary linkage.

diff --git a/configure.ac b/configure.ac
index c94704b32ab6fd46eb80919cf1f5aefbffe712fb..7e04531d51c2666ccac524188ee65459dcb481fc 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -20,14 +20,6 @@ AC_PROG_LIBTOOL
 dnl Checks for libraries.
 AC_SEARCH_LIBS([dlopen], [dl], [libdl_LIBS="$LIBS"; LIBS=""])
 AC_SUBST([libdl_LIBS])
-AC_SEARCH_LIBS([pcap_close], [pcap], [libpcap_LIBS="-lpcap"; LIBS=""])
-AC_SUBST([libpcap_LIBS])
-AM_CONDITIONAL([HAVE_PCAP], [test -n "$libpcap_LIBS"])
-if test "x$libpcap_LIBS" != "x"; then
-       enable_pcap="yes"
-else
-       enable_pcap="no"
-fi
 
 dnl Checks for header files.
 AC_HEADER_DIRENT
@@ -88,7 +80,10 @@ else
        enable_mysql="no"
 fi
 
-PKG_CHECK_MODULES([libsqlite3], [sqlite3], [], [:])
+AC_ARG_WITH([sqlite], AS_HELP_STRING([--without-sqlite], [Build without SQLITE3 output plugin [default=test]]))
+AS_IF([test "x$with_sqlite" != "xno"], [
+    PKG_CHECK_MODULES([libsqlite3], [sqlite3], [], [:])
+])
 AM_CONDITIONAL([HAVE_SQLITE3], [test -n "$libsqlite3_LIBS"])
 if test "x$libsqlite3_LIBS" != "x"; then
        enable_sqlite3="yes"
@@ -96,7 +91,10 @@ else
        enable_sqlite3="no"
 fi
 
-CT_CHECK_DBI()
+AC_ARG_WITH([dbi], AS_HELP_STRING([--without-dbi], [Build without DBI output plugin [default=test]]))
+AS_IF([test "x$with_dbi" != "xno"], [
+    CT_CHECK_DBI()
+])
 AM_CONDITIONAL(HAVE_DBI, test "x$DBI_LIB" != "x")
 if test "x$DBI_LIB" != "x"; then
        enable_dbi="yes"
@@ -104,6 +102,18 @@ else
        enable_dbi="no"
 fi
 
+AC_ARG_WITH([pcap], AS_HELP_STRING([--without-pcap], [Build without PCAP output plugin [default=test]]))
+AS_IF([test "x$with_pcap" != "xno"], [
+    AC_SEARCH_LIBS([pcap_close], [pcap], [libpcap_LIBS="-lpcap"; LIBS=""])
+    AC_SUBST([libpcap_LIBS])
+])
+AM_CONDITIONAL([HAVE_PCAP], [test -n "$libpcap_LIBS"])
+if test "x$libpcap_LIBS" != "x"; then
+       enable_pcap="yes"
+else
+       enable_pcap="no"
+fi
+
 dnl AC_SUBST(DATABASE_DIR)
 dnl AC_SUBST(DATABASE_LIB)
 dnl AC_SUBST(DATABASE_LIB_DIR)