[Qemu-devel] [PATCH V5 1/5] libqblock build system

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  Libqblock was placed in new directory ./libqblock, libtool will build
dynamic library there, source files of block layer remains in ./block.
So block related source code will generate 3 sets of binary, first is old
ones used in qemu, second and third are non PIC and PIC ones in ./libqblock.
  GCC compiler flag visibility=hidden was used with special macro, to export
only symbols that was marked as PUBLIC.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 Makefile                       |   11 +++++-
 libqblock/Makefile             |   72 ++++++++++++++++++++++++++++++++++++++++
 libqblock/libqblock.pc.in      |   13 +++++++
 3 files changed, 95 insertions(+), 1 deletions(-)
 create mode 100644 libqblock/Makefile
 create mode 100644 libqblock/libqblock-error.c
 create mode 100644 libqblock/libqblock-error.h
 create mode 100644 libqblock/libqblock-internal.h
 create mode 100644 libqblock/libqblock-types.h
 create mode 100644 libqblock/libqblock.c
 create mode 100644 libqblock/libqblock.h
 create mode 100644 libqblock/libqblock.pc.in

diff --git a/Makefile b/Makefile
index 0464297..f16ef99 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,15 @@ qemu-io$(EXESUF): qemu-io.o cmd.o $(tools-obj-y) $(block-obj-y)
 
 qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
 
+######################################################################
+# Support building shared library libqblock
+libqblock.la:
+	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C libqblock V="$(V)" TARGET_DIR="$*/" libqblock.la,)
+
+install-libqblock:
+	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C libqblock V="$(V)" TARGET_DIR="$*/" install-libqblock,)
+###########################################################################
+
 vscclient$(EXESUF): $(libcacard-y) $(oslib-obj-y) $(trace-obj-y) $(tools-obj-y) qemu-timer-common.o libcacard/vscclient.o
 	$(call quiet-command,$(CC) $(LDFLAGS) -o $@ $^ $(libcacard_libs) $(LIBS),"  LINK  $@")
 
@@ -232,7 +241,7 @@ clean:
 	rm -rf qapi-generated
 	rm -rf qga/qapi-generated
 	$(MAKE) -C tests/tcg clean
-	for d in $(ALL_SUBDIRS) $(QEMULIBS) libcacard; do \
+	for d in $(ALL_SUBDIRS) $(QEMULIBS) libcacard libqblock; do \
 	if test -d $$d; then $(MAKE) -C $$d $@ || exit 1; fi; \
 	rm -f $$d/qemu-options.def; \
         done
diff --git a/libqblock/Makefile b/libqblock/Makefile
new file mode 100644
index 0000000..cd5f4c1
--- /dev/null
+++ b/libqblock/Makefile
@@ -0,0 +1,72 @@
+###########################################################################
+# libqblock Makefile
+# Todo:
+#    1 trace related files is generated in this directory, move
+#  them to the root directory.
+##########################################################################
+-include ../config-host.mak
+-include $(SRC_PATH)/Makefile.objs
+-include $(SRC_PATH)/rules.mak
+
+#############################################################################
+# Library settings
+#############################################################################
+$(call set-vpath, $(SRC_PATH))
+
+#expand the foldered vars,especially ./block
+dummy := $(call unnest-vars)
+
+#library objects
+libqblock-y=libqblock.o libqblock-error.o
+tools-obj-y =  $(oslib-obj-y) $(trace-obj-y) qemu-tool.o qemu-timer.o \
+       qemu-timer-common.o main-loop.o notify.o \
+       iohandler.o cutils.o iov.o async.o
+tools-obj-$(CONFIG_POSIX) += compatfd.o
+
+
+QEMU_OBJS= $(libqblock-y) $(block-obj-y) $(tools-obj-y)
+QEMU_OBJS_LIB=$(patsubst %.o, %.lo, $(QEMU_OBJS))
+
+QEMU_CFLAGS+= -I../ -I../include
+#adding magic macro define for symbol hiding and exposing
+QEMU_CFLAGS+= -fvisibility=hidden -D LIBQB_BUILD
+
+#dependency libraries
+LIBS+=-lz $(LIBS_TOOLS)
+
+#header files to be installed
+libqblock-pub-headers=libqblock.h libqblock-types.h libqblock-error.h
+libqblock_includedir=$(includedir)/qblock
+libqblock_srcpath=$(SRC_PATH)/libqblock
+
+#################################################################
+# Runtime rules
+#################################################################
+clean:
+	rm -f *.lo *.o *.d *.la libqblock-test trace.c trace.c-timestamp *.pc
+	rm -rf .libs block trace audio fsdev hw net qapi qga qom slirp ui
+
+all: libqblock.la libqblock.pc
+# Dummy command so that make thinks it has done something
+	@true
+
+libqblock.la: $(QEMU_OBJS_LIB)
+	$(call quiet-command,$(LIBTOOL) --mode=link --quiet --tag=CC $(CC) -rpath $(libdir) -o $@ $^ $(LIBS),"  lt LINK $@")
+
+libqblock.pc: $(libqblock_srcpath)/libqblock.pc.in
+	$(call quiet-command,sed -e 's|@LIBDIR@|$(libdir)|' \
+		-e 's|@INCLUDEDIR@|$(libqblock_includedir)|' \
+	    -e 's|@VERSION@|$(shell cat $(SRC_PATH)/VERSION)|' \
+		-e 's|@PREFIX@|$(prefix)|' \
+		< $(libqblock_srcpath)/libqblock.pc.in > libqblock.pc,\
+	"  GEN   $@")
+
+.PHONY: install-libqblock
+
+install-libqblock: libqblock.la libqblock.pc
+	$(INSTALL_DIR) "$(DESTDIR)$(libdir)"
+	$(INSTALL_DIR) "$(DESTDIR)$(libdir)/pkgconfig"
+	$(INSTALL_DIR) "$(DESTDIR)$(libqblock_includedir)"
+	$(LIBTOOL) --mode=install $(INSTALL_DATA) libqblock.la "$(DESTDIR)$(libdir)"
+	$(LIBTOOL) --mode=install $(INSTALL_DATA) libqblock.pc "$(DESTDIR)$(libdir)/pkgconfig"
+	$(LIBTOOL) --mode=install $(INSTALL_DATA) $(libqblock-pub-headers) "$(DESTDIR)$(libqblock_includedir)"
diff --git a/libqblock/libqblock-error.c b/libqblock/libqblock-error.c
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock-error.h b/libqblock/libqblock-error.h
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock-internal.h b/libqblock/libqblock-internal.h
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock-types.h b/libqblock/libqblock-types.h
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock.c b/libqblock/libqblock.c
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock.h b/libqblock/libqblock.h
new file mode 100644
index 0000000..e69de29
diff --git a/libqblock/libqblock.pc.in b/libqblock/libqblock.pc.in
new file mode 100644
index 0000000..d2a7d06
--- /dev/null
+++ b/libqblock/libqblock.pc.in
@@ -0,0 +1,13 @@
+prefix=@PREFIX@
+exec_prefix=${prefix}
+libdir=@LIBDIR@
+includedir=@INCLUDEDIR@
+
+Name: qblock
+Description: QEMU block layer library
+Version: @VERSION@
+
+Requires:  rt gthread-2.0 glib-2.0 z curl cap-ng uuid
+Libs: -L${libdir} -lqblock
+Libs.private:
+Cflags: -I${includedir}
-- 
1.7.1