Switch from archive libraries to partial linking

Before this commit, weak symbols were not overridden by non-weak symbols
found in archive libraries when linking with recent versions of
binutils.  As stated in the System V ABI, "the link editor does not
extract archive members to resolve undefined weak symbols".

This commit changes all Makefiles to use partial linking (ld -r) instead
of creating library archives, which forces all symbols to participate in
linking, allowing non-weak symbols to override weak symbols as intended.
This approach is also used by Linux, from which the gmake function
cmd_link_o_target (defined in config.mk and used in all Makefiles) is
inspired.

The name of each former library archive is preserved except for
extensions which change from ".a" to ".o".  This commit updates
references accordingly where needed, in particular in some linker
scripts.

This commit reveals board configurations that exclude some features but
include source files that depend these disabled features in the build,
resulting in undefined symbols.  Known such cases include:
- disabling CMD_NET but not CMD_NFS;
- enabling CONFIG_OF_LIBFDT but not CONFIG_QE.

Signed-off-by: Sebastien Carlier <sebastien.carlier@gmail.com>

11 files changed, 22 insertions, 22 deletions

diff --git a/board/ti/beagle/Makefile b/board/ti/beagle/Makefile
index f797112..3b4aaac 100644
--- a/board/ti/beagle/Makefile
+++ b/board/ti/beagle/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= beagle.o
 
@@ -31,7 +31,7 @@ SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 clean:
 	rm -f $(OBJS)
diff --git a/board/ti/evm/Makefile b/board/ti/evm/Makefile
index b951bb4..2ff8356 100644
--- a/board/ti/evm/Makefile
+++ b/board/ti/evm/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= evm.o
 
@@ -31,7 +31,7 @@ SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 clean:
 	rm -f $(OBJS)
diff --git a/board/ti/omap1510inn/Makefile b/board/ti/omap1510inn/Makefile
index cd222db..9281fc2 100644
--- a/board/ti/omap1510inn/Makefile
+++ b/board/ti/omap1510inn/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= omap1510innovator.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/ti/omap1610inn/Makefile b/board/ti/omap1610inn/Makefile
index 1adcad6..4e21a37 100644
--- a/board/ti/omap1610inn/Makefile
+++ b/board/ti/omap1610inn/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= omap1610innovator.o flash.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/ti/omap2420h4/Makefile b/board/ti/omap2420h4/Makefile
index f39eef0..5174d89 100644
--- a/board/ti/omap2420h4/Makefile
+++ b/board/ti/omap2420h4/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= omap2420h4.o mem.o sys_info.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/ti/omap5912osk/Makefile b/board/ti/omap5912osk/Makefile
index e9bb0ec..e2de898 100644
--- a/board/ti/omap5912osk/Makefile
+++ b/board/ti/omap5912osk/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= omap5912osk.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/ti/omap730p2/Makefile b/board/ti/omap730p2/Makefile
index 0d7ae61..a04f7aa 100644
--- a/board/ti/omap730p2/Makefile
+++ b/board/ti/omap730p2/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= omap730p2.o flash.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/ti/panda/Makefile b/board/ti/panda/Makefile
index 81e5469..2186403 100644
--- a/board/ti/panda/Makefile
+++ b/board/ti/panda/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= panda.o
 
@@ -31,7 +31,7 @@ SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 clean:
 	rm -f $(OBJS)
diff --git a/board/ti/sdp3430/Makefile b/board/ti/sdp3430/Makefile
index 2554c7b..bce8534 100644
--- a/board/ti/sdp3430/Makefile
+++ b/board/ti/sdp3430/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= sdp.o
 
@@ -31,7 +31,7 @@ SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 clean:
 	rm -f $(OBJS)
diff --git a/board/ti/sdp4430/Makefile b/board/ti/sdp4430/Makefile
index 2554c7b..bce8534 100644
--- a/board/ti/sdp4430/Makefile
+++ b/board/ti/sdp4430/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= sdp.o
 
@@ -31,7 +31,7 @@ SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 clean:
 	rm -f $(OBJS)
diff --git a/board/ti/tnetv107xevm/Makefile b/board/ti/tnetv107xevm/Makefile
index 2446c2a..03238f0 100644
--- a/board/ti/tnetv107xevm/Makefile
+++ b/board/ti/tnetv107xevm/Makefile
@@ -19,7 +19,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS		+= sdb_board.o
 
@@ -32,7 +32,7 @@ SOBJS	:= $(addprefix $(obj),$(SOBJS))
 all: $(LIB)
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)