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 661b59d005..3529810d97 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 21f3e6e29c..5a2a0f33c7 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 e96a8aa986..7d92354d4f 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 c100e7e2ad..14c5e427b9 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 5412010ae6..f908ba0761 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 62a683d57f..5f3770044a 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 b8e43f7d6d..b5c496f763 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)