autogen.sh: moce CFLAGS from to configure.ac; print common ./configure options

Makefile.am

@@ -16,6 +16,7 @@ AM_CPPFLAGS = \
 	-DLIBEXECDIR=\""$(libexecdir)"\"
 
 AM_CFLAGS = \
+	${my_CFLAGS} \
 	-fvisibility=hidden \
 	-ffunction-sections \
 	-fdata-sections
@@ -207,11 +208,13 @@ udev_common_sources = \
 	udev/udev-builtin-kmod.c
 
 udev_common_CFLAGS = \
-	$(BLKID_CFLAGS)
+	$(BLKID_CFLAGS) \
+	$(KMOD_CFLAGS)
 
 udev_common_LDADD = \
 	libudev/libudev-private.la \
-	$(BLKID_LIBS)
+	$(BLKID_LIBS) \
+	$(BLKID_KMOD)
 
 udev_udevd_SOURCES = \
 	$(udev_common_sources) \

autogen.sh

@@ -3,21 +3,6 @@
 gtkdocize
 autoreconf --install --symlink
 
-MYCFLAGS="-g -Wall \
--Wmissing-declarations -Wmissing-prototypes \
--Wnested-externs -Wpointer-arith \
--Wpointer-arith -Wsign-compare -Wchar-subscripts \
--Wstrict-prototypes -Wshadow \
--Wformat-security -Wtype-limits"
-
-case "$CFLAGS" in
-	*-O[0-9]*)
-		;;
-	*)
-		MYCFLAGS="$MYCFLAGS -O2"
-		;;
-esac
-
 libdir() {
 	echo $(cd $1/$(gcc -print-multi-os-directory); pwd)
 }
@@ -28,8 +13,14 @@ args="--prefix=/usr \
 --libdir=$(libdir /usr/lib) \
 --with-rootlibdir=$(libdir /lib) \
 --libexecdir=/lib/udev \
---with-systemdsystemunitdir=/lib/systemd/system
+--with-systemdsystemunitdir=/lib/systemd/system \
 --with-selinux \
 --enable-gtk-doc"
 
-./configure $args CFLAGS="${CFLAGS} ${MYCFLAGS}" $@
+echo
+echo "---------------------------------------------------------------------"
+echo "Initialized udev build system. For a common configuration please run:"
+echo "---------------------------------------------------------------------"
+echo
+echo "# ./configure $args"
+echo

configure.ac

@@ -201,6 +201,14 @@ AC_ARG_ENABLE([edd],
 	[], [enable_edd=no])
 AM_CONDITIONAL([ENABLE_EDD], [test "x$enable_edd" = "xyes"])
 
+my_CFLAGS="-Wall \
+-Wmissing-declarations -Wmissing-prototypes \
+-Wnested-externs -Wpointer-arith \
+-Wpointer-arith -Wsign-compare -Wchar-subscripts \
+-Wstrict-prototypes -Wshadow \
+-Wformat-security -Wtype-limits"
+AC_SUBST([my_CFLAGS])
+
 AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_FILES([
 	Makefile