Add Makefile support for DSBT ELF.

This adds support for a new binary format, DSBT ELF, to the Makefiles.
Every shared library is assigned a DSBT index, and the link.so macro is
adjusted to ensure the correct linker argument is passed.

Configuration and ldso support will follow in separate commits.

Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Makerules

@@ -297,7 +297,8 @@ cmd_hcompile.o = $(HOSTCC) $(filter-out $(PHONY),$<) $(DEPS-$(notdir $@)) -c -o
 define link.so
 	$(Q)$(RM) $@ $@.$(2) $(dir $@)$(1)
 	@$(disp_ld)
-	$(Q)$(CC) $(LDFLAGS-$(notdir $@)) -Wl,-soname=$(notdir $@).$(2) \
+	$(Q)$(CC) $(LDFLAGS-$(notdir $@)) $(LDFLAGS-y-$(@F)) \
+		-Wl,-soname=$(notdir $@).$(2) \
 		$(NOSTDLIB_CFLAGS) -o $(dir $@)$(1) $(START_FILE-$(notdir $@)) \
 		-Wl,--whole-archive $(firstword $^) -Wl,--no-whole-archive \
 		$(LIBS-$(notdir $@)) $(LIBGCC) $(END_FILE-$(notdir $@))

ldso/ldso/Makefile.in

@@ -30,6 +30,7 @@ CFLAGS-ldso/ldso/$(TARGET_ARCH)/ := $(CFLAGS-ldso)
 
 CFLAGS-ldso.c := -DLDSO_ELFINTERP=\"$(TARGET_ARCH)/elfinterp.c\" $(CFLAGS-ldso)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-$(UCLIBC_LDSO_NAME).so := -Wl,--dsbt-index=1
 ifneq ($(SUPPORT_LD_DEBUG),y)
 LDFLAGS-$(UCLIBC_LDSO_NAME).so := $(LDFLAGS)
 else

ldso/libdl/Makefile.in

@@ -19,6 +19,7 @@ endif
 
 CFLAGS-libdl.c := -DLDSO_ELFINTERP=\"$(TARGET_ARCH)/elfinterp.c\"
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libdl.so := -Wl,--dsbt-index=3
 LDFLAGS-libdl.so := $(LDFLAGS) -Wl,-fini,dl_cleanup
 
 LIBS-libdl.so := $(LIBS) $(ldso)

libc/Makefile.in

@@ -15,6 +15,7 @@ ifneq ($(VERSION_SCRIPT),)
 VERSION_SCRIPT := -Wl,--version-script,$(VERSION_SCRIPT)
 endif
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libc.so := -Wl,--dsbt-index=2
 LDFLAGS-libc.so := $(LDFLAGS) $(VERSION_SCRIPT) -Wl,-init,$(SYMBOL_PREFIX)__uClibc_init
 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 CFLAGS += -D__USE_STDIO_FUTEXES__

libcrypt/Makefile.in

@@ -9,6 +9,7 @@ subdirs += libcrypt
 
 CFLAGS-libcrypt := -DNOT_IN_libc -DIS_IN_libcrypt $(SSP_ALL_CFLAGS)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libcrypt.so := -Wl,--dsbt-index=4
 LDFLAGS-libcrypt.so := $(LDFLAGS)
 
 LIBS-libcrypt.so := $(LIBS)

libm/Makefile.in

@@ -25,6 +25,7 @@ subdirs += libm
 CFLAGS-libm := -DNOT_IN_libc -DIS_IN_libm $(SSP_ALL_CFLAGS)
 CFLAGS-libm += -D_IEEE_LIBM
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libm.so := -Wl,--dsbt-index=5
 LDFLAGS-libm.so := $(LDFLAGS)
 
 LIBS-libm.so := $(LIBS)

libnsl/Makefile.in

@@ -9,6 +9,7 @@ subdirs += libnsl
 
 CFLAGS-libnsl := -DNOT_IN_libc -DIS_IN_libnsl $(SSP_ALL_CFLAGS)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libnsl.so := -Wl,--dsbt-index=6
 LDFLAGS-libnsl.so := $(LDFLAGS) $(call link.asneeded,-lc)
 
 LIBS-libnsl.so := $(LIBS)

libpthread/linuxthreads.old/Makefile.in

@@ -18,6 +18,7 @@ LDFLAGS-libpthread.so := $(LDFLAGS_NOSTRIP) -Wl,-z,defs
 else
 LDFLAGS-libpthread.so := $(LDFLAGS)
 endif
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libpthread.so := -Wl,--dsbt-index=10
 
 LIBS-libpthread.so := $(LIBS) $(ldso)
 

libresolv/Makefile.in

@@ -9,6 +9,7 @@ subdirs += libresolv
 
 CFLAGS-libresolv := -DNOT_IN_libc -DIS_IN_libresolv $(SSP_ALL_CFLAGS)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libresolv.so := -Wl,--dsbt-index=7
 LDFLAGS-libresolv.so := $(LDFLAGS) $(call link.asneeded,-lc)
 
 LIBS-libresolv.so := $(LIBS)

librt/Makefile.in

@@ -9,6 +9,7 @@ subdirs += librt
 
 CFLAGS-librt := -DNOT_IN_libc -DIS_IN_librt $(SSP_ALL_CFLAGS)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-librt.so := -Wl,--dsbt-index=9
 LDFLAGS-librt.so := $(LDFLAGS)
 LIBS-librt.so := $(LIBS)
 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)

libutil/Makefile.in

@@ -9,6 +9,7 @@ subdirs += libutil
 
 CFLAGS-libutil := -DNOT_IN_libc -DIS_IN_libutil $(SSP_ALL_CFLAGS)
 
+LDFLAGS-$(UCLIBC_FORMAT_DSBT_ELF)-libutil.so := -Wl,--dsbt-index=8
 LDFLAGS-libutil.so := $(LDFLAGS)
 
 LIBS-libutil.so := $(LIBS)