build-sys: add CFLAGS and LDFLAGS for daemons and shared libs

This is necessary for paranoid security guys who believe that things
like "-Wl,-z,relro" or "-Wl,-z,bind_now" is a way how to make the
world a safer place...

Signed-off-by: Karel Zak <kzak@redhat.com>

Documentation/howto-compilation.txt

@@ -27,12 +27,12 @@ Compiling
 	The SUID_* feature is currently supported for chfn, chsh,
 	newgrp, su, write, mount, and umount.
 
-	Preferred compilation options for developers, when
-	using gcc, are:
+	Use DAEMON_CFLAGS and DAEMON_LDFLAGS when you want to define
+	special compiler options for daemons; supported for uuidd.
 
-	export CFLAGS="-Wmissing-parameter-type -Wsign-compare
-	-Wtype-limits -Wuninitialized -Wunused-parameter
-	-Wunused-but-set-parameter -fno-common"
+	Use SOLIB_CFLAGS and SOLIB_LDFLAGS when you want to define
+	special compiler options for shared libraries; supported for
+	libmount, libblkid and libuuid.
 
 	FIXME: add notes about klib and uClib.
 

configure.ac

@@ -1473,6 +1473,16 @@ AC_ARG_VAR([SUID_CFLAGS],
 AC_ARG_VAR([SUID_LDFLAGS],
 	   [LDFLAGS used for binaries which are usually with the suid bit])
 
+AC_ARG_VAR([DAEMON_CFLAGS],
+	   [CFLAGS used for binaries which are usually executed as daemons])
+AC_ARG_VAR([DAEMON_LDFLAGS],
+	   [LDFLAGS used for binaries which are usually executed as daemons])
+
+AC_ARG_VAR([SOLIB_CFLAGS],
+	   [CFLAGS used for shared libraries])
+AC_ARG_VAR([SOLIB_LDFLAGS],
+	   [LDFLAGS used for shared libraries])
+
 LIBS=""
 
 

libblkid/src/Makemodule.am

@@ -113,6 +113,7 @@ libblkid_la_LIBADD = libcommon.la
 
 
 libblkid_la_CFLAGS = \
+	$(SOLIB_CFLAGS) \
 	-I$(ul_libblkid_incdir) \
 	-I$(top_srcdir)/libblkid/src
 
@@ -128,6 +129,7 @@ libblkid_la_DEPENDENCIES = \
 	libblkid/src/blkid.h.in
 
 libblkid_la_LDFLAGS = \
+	$(SOLIB_LDFLAGS) \
 	-Wl,--version-script=$(top_srcdir)/libblkid/src/blkid.sym \
 	-version-info $(LIBBLKID_VERSION_INFO)
 

libmount/src/Makemodule.am

@@ -33,6 +33,7 @@ nodist_libmount_la_SOURCES = libmount/src/mountP.h
 libmount_la_LIBADD = libcommon.la libblkid.la $(SELINUX_LIBS)
 
 libmount_la_CFLAGS = \
+	$(SOLIB_CFLAGS) \
 	-I$(ul_libblkid_incdir) \
 	-I$(ul_libmount_incdir) \
 	-I$(top_srcdir)/libmount/src
@@ -43,6 +44,7 @@ libmount_la_DEPENDENCIES = \
 	libmount/src/libmount.h.in
 
 libmount_la_LDFLAGS = \
+	$(SOLIB_LDFLAGS) \
 	-Wl,--version-script=$(top_srcdir)/libmount/src/libmount.sym \
 	-version-info $(LIBMOUNT_VERSION_INFO)
 

libuuid/src/Makemodule.am

@@ -29,9 +29,14 @@ libuuid_la_SOURCES = \
 
 libuuid_la_DEPENDENCIES = libuuid/src/uuid.sym
 libuuid_la_LIBADD       = $(SOCKET_LIBS)
-libuuid_la_CFLAGS       = -I$(ul_libuuid_incdir) -Ilibuuid/src
+
+libuuid_la_CFLAGS = \
+	 $(SOLIB_CFLAGS) \
+	 -I$(ul_libuuid_incdir) \
+	 -Ilibuuid/src
 
 libuuid_la_LDFLAGS = \
+	$(SOLIB_LDFLAGS) \
 	-Wl,--version-script=$(top_srcdir)/libuuid/src/uuid.sym \
 	-version-info $(LIBUUID_VERSION_INFO)
 

misc-utils/Makemodule.am

@@ -77,7 +77,8 @@ if BUILD_UUIDD
 usrsbin_exec_PROGRAMS += uuidd
 dist_man_MANS += misc-utils/uuidd.8
 uuidd_LDADD = $(LDADD) libuuid.la libcommon.la
-uuidd_CFLAGS = $(AM_CFLAGS) -I$(ul_libuuid_incdir)
+uuidd_CFLAGS = $(DAEMON_CFLAGS) $(AM_CFLAGS) -I$(ul_libuuid_incdir)
+uuidd_LDFLAGS = $(DAEMON_LDFLAGS) $(AM_LDFLAGS)
 uuidd_SOURCES = misc-utils/uuidd.c
 if USE_SOCKET_ACTIVATION
 uuidd_SOURCES += misc-utils/sd-daemon.c misc-utils/sd-daemon.h