[XEN PATCH v4 16/32] tools: Introduce $(xenlibs-ldlibs, ) macro

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

This can be used when linking against multiple in-tree Xen libraries,
and avoid duplicated flags. It can be used instead of multiple
$(LDLIBS_libxen*).

For now, replace the open-coding in libs.mk.

The macro $(xenlibs-libs, ) will be useful later when only the path to
the libraries is wanted (e.g. for checking for dependencies).

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
---
 tools/Rules.mk     | 16 ++++++++++++++--
 tools/libs/libs.mk |  2 +-
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/tools/Rules.mk b/tools/Rules.mk
index 23979ed254..ce77dd2eb1 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -93,12 +93,24 @@ define xenlibs-rpath
     $(addprefix -Wl$(comma)-rpath-link=$(XEN_ROOT)/tools/libs/,$(call 
xenlibs-dependencies,$(1)))
 endef
 
+# Provide a path for each library in $(1)
+define xenlibs-libs
+    $(foreach lib,$(1), \
+        $(XEN_ROOT)/tools/libs/$(lib)/lib$(FILENAME_$(lib))$(libextension))
+endef
+
+# Flags for linking against all Xen libraries listed in $(1)
+define xenlibs-ldlibs
+    $(call xenlibs-rpath,$(1)) $(call xenlibs-libs,$(1)) \
+    $(foreach lib,$(1),$(xenlibs-ldlibs-$(lib)))
+endef
+
 define LIB_defs
  FILENAME_$(1) ?= xen$(1)
  XEN_libxen$(1) = $$(XEN_ROOT)/tools/libs/$(1)
  CFLAGS_libxen$(1) = $$(CFLAGS_xeninclude)
  SHLIB_libxen$(1) = $$(call xenlibs-rpath,$(1)) 
-Wl,-rpath-link=$$(XEN_libxen$(1))
- LDLIBS_libxen$(1) = $$(call xenlibs-rpath,$(1)) 
$$(XEN_libxen$(1))/lib$$(FILENAME_$(1))$$(libextension)
+ LDLIBS_libxen$(1) = $$(call xenlibs-ldlibs,$(1))
 endef
 
 $(foreach lib,$(LIBS_LIBS),$(eval $(call LIB_defs,$(lib))))
@@ -108,7 +120,7 @@ $(foreach lib,$(LIBS_LIBS),$(eval $(call LIB_defs,$(lib))))
 CFLAGS_libxenctrl += -D__XEN_TOOLS__
 
 ifeq ($(CONFIG_Linux),y)
-LDLIBS_libxenstore += -ldl
+xenlibs-ldlibs-store := -ldl
 endif
 
 CFLAGS_libxenlight += $(CFLAGS_libxenctrl)
diff --git a/tools/libs/libs.mk b/tools/libs/libs.mk
index d7e1274249..2b8e7a6128 100644
--- a/tools/libs/libs.mk
+++ b/tools/libs/libs.mk
@@ -18,7 +18,7 @@ CFLAGS   += -Werror -Wmissing-prototypes
 CFLAGS   += $(CFLAGS_xeninclude)
 CFLAGS   += $(foreach lib, $(USELIBS_$(LIBNAME)), $(CFLAGS_libxen$(lib)))
 
-LDLIBS += $(foreach lib, $(USELIBS_$(LIBNAME)), $(LDLIBS_libxen$(lib)))
+LDLIBS += $(call xenlibs-ldlibs,$(USELIBS_$(LIBNAME)))
 
 PIC_OBJS := $(OBJS-y:.o=.opic)
 
-- 
Anthony PERARD