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 f7971127c82..3b4aaace231 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 b951bb4ed7f..2ff83567ce5 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 cd222dbc164..9281fc2f49b 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 1adcad64e08..4e21a3724ff 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 f39eef0adb1..5174d8959b2 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 e9bb0ecd724..e2de898501b 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 0d7ae6145cc..a04f7aa7c25 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 81e54692bb3..21864037327 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 2554c7b0813..bce85342a80 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 2554c7b0813..bce85342a80 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 2446c2ae12e..03238f0afb3 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)