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>

7 files changed, 14 insertions, 14 deletions

diff --git a/board/renesas/MigoR/Makefile b/board/renesas/MigoR/Makefile
index 661b59d00..3529810d9 100644
--- a/board/renesas/MigoR/Makefile
+++ b/board/renesas/MigoR/Makefile
@@ -24,7 +24,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= migo_r.o
 SOBJS	:= lowlevel_init.o
@@ -34,7 +34,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/renesas/ap325rxa/Makefile b/board/renesas/ap325rxa/Makefile
index 21f3e6e29..5a2a0f33c 100644
--- a/board/renesas/ap325rxa/Makefile
+++ b/board/renesas/ap325rxa/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= ap325rxa.o cpld-ap325rxa.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/renesas/r2dplus/Makefile b/board/renesas/r2dplus/Makefile
index e96a8aa98..7d92354d4 100644
--- a/board/renesas/r2dplus/Makefile
+++ b/board/renesas/r2dplus/Makefile
@@ -19,7 +19,7 @@
 #
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= r2dplus.o
 SOBJS	:= lowlevel_init.o
@@ -29,7 +29,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/renesas/r7780mp/Makefile b/board/renesas/r7780mp/Makefile
index c100e7e2a..14c5e427b 100644
--- a/board/renesas/r7780mp/Makefile
+++ b/board/renesas/r7780mp/Makefile
@@ -20,7 +20,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= r7780mp.o
 SOBJS	:= lowlevel_init.o
@@ -30,7 +30,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/renesas/rsk7203/Makefile b/board/renesas/rsk7203/Makefile
index 5412010ae..f908ba076 100644
--- a/board/renesas/rsk7203/Makefile
+++ b/board/renesas/rsk7203/Makefile
@@ -21,7 +21,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= lib$(BOARD).o
 
 OBJS	:= rsk7203.o
 SOBJS	:= lowlevel_init.o
@@ -31,7 +31,7 @@ OBJS	:= $(addprefix $(obj),$(OBJS))
 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/renesas/sh7763rdp/Makefile b/board/renesas/sh7763rdp/Makefile
index 62a683d57..5f3770044 100644
--- a/board/renesas/sh7763rdp/Makefile
+++ b/board/renesas/sh7763rdp/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= sh7763rdp.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
diff --git a/board/renesas/sh7785lcr/Makefile b/board/renesas/sh7785lcr/Makefile
index b8e43f7d6..b5c496f76 100644
--- a/board/renesas/sh7785lcr/Makefile
+++ b/board/renesas/sh7785lcr/Makefile
@@ -18,13 +18,13 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= sh7785lcr.o selfcheck.o rtl8169_mac.o
 SOBJS	:= lowlevel_init.o
 
 $(LIB):	$(obj).depend $(COBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(COBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(COBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)