[Qemu-devel] [PATCH] libcacard: add libcacard.la target

[Alon Levy <alevy@redhat.com>]

No flag to configure is required. Instead, added a libcacard.la target that
is not built by default, only when requested explicitly via:

mkdir build
cd build
../configure
make libcacard.la
make install-libcacard

Uses libtool to do actual linking of object files and shared library, and
installing. Tested only under linux, but supposed to work on other systems as
well.

If libtool isn't found you get a message complaining about that, only at build
time (since it is not a default target I did not add a message at configure
time).

Note: please ignore the following warning message, it is harmless, and fixing
it would require using libtool to build trace-dtrace.lo which, since it isn't
built by gcc, I don't know how to do.

 *** Warning: Linking the shared library libcacard.la against the non-libtool
 *** objects  ../trace-dtrace.o is not portable!
---
 Makefile           |   17 +++++++++++++++++
 configure          |   12 +++++++++++-
 libcacard/Makefile |   38 ++++++++++++++++++++++++++++++++++----
 3 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 2b0438c..0215307 100644
--- a/Makefile
+++ b/Makefile
@@ -119,6 +119,23 @@ version.o: $(SRC_PATH)/version.rc config-host.mak
 
 version-obj-$(CONFIG_WIN32) += version.o
 ######################################################################
+# Support building shared library libcacard
+
+.PHONY: libcacard.la install-libcacard
+ifeq ($(LIBTOOL),)
+libcacard.la:
+	@echo libtool is missing, please install and rerun configure
+
+install-libcacard:
+	@echo libtool is missing, please install and rerun configure
+else
+libcacard.la: $(GENERATED_HEADERS) $(oslib-obj-y) qemu-malloc.o qemu-timer-common.o $(trace-obj-y)
+	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C libcacard V="$(V)" TARGET_DIR="$*/" libcacard.la,)
+
+install-libcacard: libcacard.la
+	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C libcacard V="$(V)" TARGET_DIR="$*/" install-libcacard,)
+endif
+######################################################################
 
 qemu-img.o: qemu-img-cmds.h
 qemu-img.o qemu-tool.o qemu-nbd.o qemu-io.o cmd.o: $(GENERATED_HEADERS)
diff --git a/configure b/configure
index 0627f1d..e62841e 100755
--- a/configure
+++ b/configure
@@ -1276,6 +1276,15 @@ if ! has $pkg_config; then
 fi
 
 ##########################################
+# libtool probe
+
+if ! has libtool; then
+    libtool=
+else
+    libtool=libtool
+fi
+
+##########################################
 # Sparse probe
 if test "$sparse" != "no" ; then
   if has cgcc; then
@@ -3060,6 +3069,7 @@ echo "AR=$ar" >> $config_host_mak
 echo "OBJCOPY=$objcopy" >> $config_host_mak
 echo "LD=$ld" >> $config_host_mak
 echo "WINDRES=$windres" >> $config_host_mak
+echo "LIBTOOL=$libtool" >> $config_host_mak
 echo "CFLAGS=$CFLAGS" >> $config_host_mak
 echo "QEMU_CFLAGS=$QEMU_CFLAGS" >> $config_host_mak
 echo "QEMU_INCLUDES=$QEMU_INCLUDES" >> $config_host_mak
@@ -3595,7 +3605,7 @@ if [ "$source_path" != `pwd` ]; then
     # out of tree build
     mkdir -p libcacard
     rm -f libcacard/Makefile
-    ln -s "$source_path/libcacard/Makefile" libcacard/Makefile
+    symlink "$source_path/libcacard/Makefile" libcacard/Makefile
 fi
 
 d=libuser
diff --git a/libcacard/Makefile b/libcacard/Makefile
index 1d34df0..3a5ad61 100644
--- a/libcacard/Makefile
+++ b/libcacard/Makefile
@@ -4,15 +4,45 @@
 
 $(call set-vpath, $(SRC_PATH):$(SRC_PATH)/libcacard)
 
-QEMU_OBJS=$(addprefix ../, $(oslib-obj-y) $(trace-obj-y) qemu-malloc.o qemu-timer-common.o)
+QEMU_TRACE_OBJS=$(addprefix ../,$(trace-obj-y))
+
+QEMU_BASE_OBJS=$(addprefix ../,$(oslib-obj-y) qemu-malloc.o qemu-timer-common.o)
+
+# objects linked against normal qemu binaries, not compiled with libtool
+QEMU_OBJS = $(QEMU_BASE_OBJS) $(QEMU_TRACE_OBJS)
+
+# objects linked into a shared library, built with libtool with -fPIC if required
+QEMU_BASE_OBJS_LIB=$(addsuffix .lo,$(basename $(QEMU_BASE_OBJS)))
+
+QEMU_OBJS_LIB = $(QEMU_BASE_OBJS_LIB) $(QEMU_TRACE_OBJS)
 
 QEMU_CFLAGS+=-I../
 
+libcacard.lib-y=$(addsuffix .lo,$(basename $(libcacard-y)))
+
 vscclient: $(libcacard-y) $(QEMU_OBJS) vscclient.o
-	$(call quiet-command,$(CC) $(libcacard_libs) -lrt -o $@ $^,"  LINK  $(TARGET_DIR)$@")
+	$(call quiet-command,$(CC) $(libcacard_libs) -lrt -o $@ $^,"  LINK  $@")
+
+clean:
+	rm -f *.o */*.o *.d */*.d *.a */*.a *~ */*~ vscclient libcacard.so *.lo .libs/* *.la
+	rm -Rf .libs
 
 all: vscclient
 
-clean:
-	rm -f *.o */*.o *.d */*.d *.a */*.a *~ */*~ vscclient
+ifeq ($(LIBTOOL),)
+libcacard.la:
+	@echo libtool is missing, please install and rerun configure
+
+install-libcacard:
+	@echo libtool is missing, please install and rerun configure
+else
+$(libcacard.lib-y) $(QEMU_BASE_OBJS_LIB) : %.lo: %.c
+	$(call quiet-command,libtool --mode=compile --quiet --tag=CC $(CC) $(QEMU_CFLAGS) $(QEMU_INCLUDES) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  lt CC $@")
+
+libcacard.la: $(libcacard.lib-y) $(QEMU_OBJS_LIB)
+	$(call quiet-command,libtool --mode=link --quiet --tag=CC $(CC) $(libcacard_libs) -lrt -rpath $(libdir) -o $@ $^,"  lt LINK $@")
 
+install-libcacard: libcacard.la
+	$(INSTALL_DIR) "$(DESTDIR)$(libdir)"
+	libtool --mode=install $(INSTALL_PROG) libcacard.la "$(DESTDIR)$(libdir)"
+endif
-- 
1.7.5.1