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>

14 files changed, 28 insertions, 28 deletions

diff --git a/arch/powerpc/cpu/74xx_7xx/Makefile b/arch/powerpc/cpu/74xx_7xx/Makefile
index fe905f31fe2..8c2800b26b8 100644
--- a/arch/powerpc/cpu/74xx_7xx/Makefile
+++ b/arch/powerpc/cpu/74xx_7xx/Makefile
@@ -26,7 +26,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 SOBJS	= cache.o kgdb.o io.o
@@ -39,7 +39,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc512x/Makefile b/arch/powerpc/cpu/mpc512x/Makefile
index 37b06f346ed..cb1263ab7ca 100644
--- a/arch/powerpc/cpu/mpc512x/Makefile
+++ b/arch/powerpc/cpu/mpc512x/Makefile
@@ -24,7 +24,7 @@ include $(TOPDIR)/config.mk
 
 $(shell mkdir -p $(OBJTREE)/board/freescale/common)
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 COBJS-y	:= cpu.o
@@ -50,7 +50,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc5xx/Makefile b/arch/powerpc/cpu/mpc5xx/Makefile
index 80c53203e96..078b52477a4 100644
--- a/arch/powerpc/cpu/mpc5xx/Makefile
+++ b/arch/powerpc/cpu/mpc5xx/Makefile
@@ -35,7 +35,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 COBJS	= serial.o cpu.o cpu_init.o interrupts.o traps.o speed.o spi.o
@@ -47,7 +47,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc5xxx/Makefile b/arch/powerpc/cpu/mpc5xxx/Makefile
index 0ee0611550b..ecaeb22a643 100644
--- a/arch/powerpc/cpu/mpc5xxx/Makefile
+++ b/arch/powerpc/cpu/mpc5xxx/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 SOBJS	= io.o firmware_sc_task_bestcomm.impl.o
@@ -37,7 +37,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc8220/Makefile b/arch/powerpc/cpu/mpc8220/Makefile
index b4fad286dcb..b8529efe912 100644
--- a/arch/powerpc/cpu/mpc8220/Makefile
+++ b/arch/powerpc/cpu/mpc8220/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 SOBJS	= io.o fec_dma_tasks.o
@@ -38,7 +38,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc824x/Makefile b/arch/powerpc/cpu/mpc824x/Makefile
index a57ad12c41e..2bfcd8548c2 100644
--- a/arch/powerpc/cpu/mpc824x/Makefile
+++ b/arch/powerpc/cpu/mpc824x/Makefile
@@ -27,7 +27,7 @@ $(shell mkdir -p $(obj)drivers/epic)
 $(shell mkdir -p $(obj)drivers/i2c)
 endif
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 COBJS	= traps.o cpu.o cpu_init.o interrupts.o speed.o \
@@ -41,7 +41,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 $(obj)bedbug_603e.c:
 	ln -sf $(src)../mpc8260/bedbug_603e.c $(obj)bedbug_603e.c
diff --git a/arch/powerpc/cpu/mpc8260/Makefile b/arch/powerpc/cpu/mpc8260/Makefile
index 9f0c2dd50cc..aa8b88105a8 100644
--- a/arch/powerpc/cpu/mpc8260/Makefile
+++ b/arch/powerpc/cpu/mpc8260/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o kgdb.o
 COBJS	= traps.o serial_smc.o serial_scc.o cpu.o cpu_init.o speed.o \
@@ -41,7 +41,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(obj)kgdb.o
+	$(call cmd_link_o_target, $(OBJS) $(obj)kgdb.o)
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc83xx/Makefile b/arch/powerpc/cpu/mpc83xx/Makefile
index 15e2c18b137..3979b6fbab6 100644
--- a/arch/powerpc/cpu/mpc83xx/Makefile
+++ b/arch/powerpc/cpu/mpc83xx/Makefile
@@ -25,7 +25,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 
@@ -50,7 +50,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index b7c02721052..63d79233d5a 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -26,7 +26,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o resetvec.o
 SOBJS-$(CONFIG_MP)	+= release.o
@@ -95,7 +95,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc86xx/Makefile b/arch/powerpc/cpu/mpc86xx/Makefile
index daca79ad4f2..9b2db1bccb6 100644
--- a/arch/powerpc/cpu/mpc86xx/Makefile
+++ b/arch/powerpc/cpu/mpc86xx/Makefile
@@ -26,7 +26,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	= start.o
 
@@ -51,7 +51,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(ASOBJS) $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc8xx/Makefile b/arch/powerpc/cpu/mpc8xx/Makefile
index 5f70459690a..527771edaa5 100644
--- a/arch/powerpc/cpu/mpc8xx/Makefile
+++ b/arch/powerpc/cpu/mpc8xx/Makefile
@@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
 
 # CFLAGS += -DET_DEBUG
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START-y	+= start.o
 START-y	+= kgdb.o
@@ -54,7 +54,7 @@ START	:= $(addprefix $(obj),$(START-y))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(obj)kgdb.o
+	$(call cmd_link_o_target, $(OBJS) $(obj)kgdb.o)
 
 #########################################################################
 
diff --git a/arch/powerpc/cpu/mpc8xxx/Makefile b/arch/powerpc/cpu/mpc8xxx/Makefile
index ea5122289e2..ab80dd77230 100644
--- a/arch/powerpc/cpu/mpc8xxx/Makefile
+++ b/arch/powerpc/cpu/mpc8xxx/Makefile
@@ -8,7 +8,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib8xxx.a
+LIB	= $(obj)lib8xxx.o
 
 ifneq ($(CPU),mpc83xx)
 COBJS-y	+= cpu.o
@@ -24,7 +24,7 @@ OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
 all:	$(obj).depend $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 include $(SRCTREE)/rules.mk
 
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/Makefile b/arch/powerpc/cpu/mpc8xxx/ddr/Makefile
index cb7f856554c..4a5a78558be 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/Makefile
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/Makefile
@@ -8,7 +8,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)libddr.a
+LIB	= $(obj)libddr.o
 
 COBJS-$(CONFIG_FSL_DDR1)	+= main.o util.o ctrl_regs.o options.o \
 				   lc_common_dimm_params.o
@@ -28,7 +28,7 @@ OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
 all:	$(obj).depend $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 include $(SRCTREE)/rules.mk
 
diff --git a/arch/powerpc/cpu/ppc4xx/Makefile b/arch/powerpc/cpu/ppc4xx/Makefile
index fa8d10c627c..129a61e939e 100644
--- a/arch/powerpc/cpu/ppc4xx/Makefile
+++ b/arch/powerpc/cpu/ppc4xx/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(CPU).a
+LIB	= $(obj)lib$(CPU).o
 
 START	:= resetvec.o
 START	+= start.o
@@ -82,7 +82,7 @@ START	:= $(addprefix $(obj),$(START))
 all:	$(obj).depend $(START) $(LIB)
 
 $(LIB):	$(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
 
 #########################################################################