[dpdk-dev] [PATCH RFC 11/13] mk: Use LDLIBS when linking shared libraries

[Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>]

This patch mainly makes use of the LDLIBS variable when linking shared
libraries, setting proper DT_NEEDED entries.
This patch also fix a few nits like syntax highlighting, the command
string (O_TO_S_STR) used for linking shared libraries and the displayed
of dependencies when debugging is enable (D).

Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
---
 mk/rte.lib.mk | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk
index 7c99fd1..559c76a 100644
--- a/mk/rte.lib.mk
+++ b/mk/rte.lib.mk
@@ -59,16 +59,19 @@ build: _postbuild
 
 exe2cmd = $(strip $(call dotfile,$(patsubst %,%.cmd,$(1))))
 
+_LDLIBS := -z defs --as-needed $(LDLIBS) $(EXECENV_LDLIBS) --no-as-needed
+
 ifeq ($(LINK_USING_CC),1)
 # Override the definition of LD here, since we're linking with CC
 LD := $(CC) $(CPU_CFLAGS)
 _CPU_LDFLAGS := $(call linkerprefix,$(CPU_LDFLAGS))
+_LDLIBS := $(call linkerprefix,$(_LDLIBS))
 else
 _CPU_LDFLAGS := $(CPU_LDFLAGS)
 endif
 
 O_TO_A = $(AR) crus $(LIB) $(OBJS-y)
-O_TO_A_STR = $(subst ','\'',$(O_TO_A)) #'# fix syntax highlight
+O_TO_A_STR = $(subst ','\'',$(O_TO_A)) #')# fix syntax highlight
 O_TO_A_DISP = $(if $(V),"$(O_TO_A_STR)","  AR $(@)")
 O_TO_A_CMD = "cmd_$@ = $(O_TO_A_STR)"
 O_TO_A_DO = @set -e; \
@@ -76,9 +79,11 @@ O_TO_A_DO = @set -e; \
 	$(O_TO_A) && \
 	echo $(O_TO_A_CMD) > $(call exe2cmd,$(@))
 
-O_TO_S = $(LD) $(_CPU_LDFLAGS) -shared $(OBJS-y) -o $(LIB)
-O_TO_S_STR = $(subst ','\'',$(O_TO_S)) #'# fix syntax highlight
+O_TO_S = $(LD) $(_CPU_LDFLAGS) -L $(RTE_OUTPUT)/lib \
+		 -shared $(OBJS-y) $(_LDLIBS) -o $(LIB)
+O_TO_S_STR = $(subst ','\'',$(O_TO_S)) #')# fix syntax highlight
 O_TO_S_DISP = $(if $(V),"$(O_TO_S_STR)","  LD $(@)")
+O_TO_S_CMD = "cmd_$@ = $(O_TO_S_STR)"
 O_TO_S_DO = @set -e; \
 	echo $(O_TO_S_DISP); \
 	$(O_TO_S) && \
@@ -93,7 +98,7 @@ ifeq ($(RTE_BUILD_SHARED_LIB),y)
 $(LIB): $(OBJS-y) $(DEP_$(LIB)) FORCE
 	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
 	$(if $(D),\
-		@echo -n "$< -> $@ " ; \
+		@echo -n "$? -> $@ " ; \
 		echo -n "file_missing=$(call boolean,$(file_missing)) " ; \
 		echo -n "cmdline_changed=$(call boolean,$(call cmdline_changed,$(O_TO_S_STR))) " ; \
 		echo -n "depfile_missing=$(call boolean,$(depfile_missing)) " ; \
@@ -108,7 +113,7 @@ else
 $(LIB): $(OBJS-y) $(DEP_$(LIB)) FORCE
 	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
 	$(if $(D),\
-	    @echo -n "$< -> $@ " ; \
+	    @echo -n "$? -> $@ " ; \
 	    echo -n "file_missing=$(call boolean,$(file_missing)) " ; \
 	    echo -n "cmdline_changed=$(call boolean,$(call cmdline_changed,$(O_TO_A_STR))) " ; \
 	    echo -n "depfile_missing=$(call boolean,$(depfile_missing)) " ; \
-- 
1.9.3