build: copied some updates frop pptp plugin (build-time warnings & error options)

.gitignore

-# Temporary files
 *~
-*.swp
-
-# Compiled files
 *.o
-*.la
 *.lo
-auth-dialog/nm-l2tp-auth-dialog
-src/nm-l2tp-service
-
-# Generated
-nm-l2tp-service.name
-src/nm-l2tp-pppd-service-glue.h
-
-# GNU Autotools
-.deps
-.libs
+*.la
+Makefile
+Makefile.in*
+configure
+compile
+config.*
 aclocal.m4
-autom4te.cache/
 depcomp
-compile
-config.guess
-config.h
-config.h.in
-config.h~
-config.log
-config.status
-config.sub
-configure
 install-sh
-intltool-extract.in
-intltool-merge.in
-intltool-update.in
 libtool
 ltmain.sh
-m4/
-Makefile
-Makefile.in
 missing
-po/*.pot
-po/Makefile.in.in
-po/POTFILES
-po/stamp-it
-stamp-h1
-
-#cdt files
-.autotools
-.cproject
-.project
-
-# gmo 
-*.gmo
+mkinstalldirs
+POTFILES
+stamp-*
+.deps
+.libs
+autom4te.cache
+intltool-*
+po/*.gmo
+po/.intltool-merge-cache
+m4/gtk-doc.m4
+m4/intltool.m4
+m4/libtool.m4
+m4/lt*.m4
 
+auth-dialog/nm-l2tp-auth-dialog
+nm-l2tp-service.name
+nm-l2tp.desktop
+src/nm-l2tp-pppd-service-glue.h
+src/nm-l2tp-service

Makefile.am

@@ -29,6 +29,8 @@ endif
 nm-l2tp-service.name: $(srcdir)/nm-l2tp-service.name.in
 	sed -e 's|[@]LIBEXECDIR[@]|$(libexecdir)|g' $< >$@
 
+DISTCHECK_CONFIGURE_FLAGS = --enable-more-warnings=yes
+
 EXTRA_DIST = nm-l2tp-service.name.in \
              $(dbusservice_DATA)  \
              $(desktopfile) \

configure.ac

@@ -70,10 +70,10 @@ AC_SUBST(DBUS_GLIB_CFLAGS)
 AC_SUBST(DBUS_GLIB_LIBS)
 
 PKG_CHECK_MODULES(NM,
-                  NetworkManager >= 0.9.0
-				  libnm-util
-				  libnm-glib
-				  libnm-glib-vpn)
+                  NetworkManager >= 0.9.4
+                  libnm-util >= 0.9.4
+                  libnm-glib >= 0.9.4
+                  libnm-glib-vpn >= 0.9.4)
 AC_SUBST(NM_CFLAGS)
 AC_SUBST(NM_LIBS)
 
@@ -102,6 +102,8 @@ if test x"$with_gnome" != xno; then
 	AC_SUBST(GNOMEKEYRING_LIBS)
 fi
 
+NM_COMPILER_WARNINGS
+
 dnl
 dnl Distribution version string
 dnl

m4/compiler_warnings.m4

+AC_DEFUN([NM_COMPILER_WARNINGS],
+[AC_ARG_ENABLE(more-warnings,
+	AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
+	set_more_warnings="$enableval",set_more_warnings=error)
+AC_MSG_CHECKING(for more warnings)
+if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
+	AC_MSG_RESULT(yes)
+	CFLAGS="-Wall -std=gnu89 $CFLAGS"
+
+	for option in -Wshadow -Wmissing-declarations -Wmissing-prototypes \
+		      -Wdeclaration-after-statement -Wstrict-prototypes \
+		      -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare \
+		      -fno-strict-aliasing -Wno-unused-but-set-variable; do
+		SAVE_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS $option"
+		AC_MSG_CHECKING([whether gcc understands $option])
+		AC_TRY_COMPILE([], [],
+			has_option=yes,
+			has_option=no,)
+		if test $has_option = no; then
+			CFLAGS="$SAVE_CFLAGS"
+		fi
+		AC_MSG_RESULT($has_option)
+		unset has_option
+		unset SAVE_CFLAGS
+	done
+	unset option
+	if test "x$set_more_warnings" = xerror; then
+		CFLAGS="$CFLAGS -Werror"
+	fi
+else
+	AC_MSG_RESULT(no)
+fi
+])