check_ld some more flags

  gold does not currently implement these.

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

Rules.mak

@@ -282,7 +282,7 @@ endif
 	# Idx Name          Size      VMA       LMA       File off  Algn
 	#   0 .text         xxxxxxxx  00000000  00000000  xxxxxxxx  2**2 <===!
 	CPU_CFLAGS-y  += $(call check_gcc,-ffunction-sections -fdata-sections,)
-ifneq ($(call check_ld,--sort-common,),)
+ifneq ($(call check_ld,--sort-common),)
 	CPU_LDFLAGS-y += -Wl,--sort-common
 endif
 ifneq ($(call check_ld,--sort-section alignment),)
@@ -547,8 +547,11 @@ ifneq ($(HAVE_SHARED),y)
 CFLAGS += -DSTATIC
 endif
 
+LDFLAG_WARN_ONCE:=$(if $(call check_ld,--warn-once),-Wl$(comma)--warn-once)
+LDFLAG_SORT_COMMON:=$(if $(call check_ld,--sort-common),-Wl$(comma)--sort-common)
+LDFLAG_DISCARD_ALL:=$(if $(call check_ld,--discard-all),-Wl$(comma)--discard-all)
 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
-	-Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
+	-Wl,--warn-common $(LDFLAG_WARN_ONCE) -Wl,-z,combreloc
 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
 #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
 

ldso/ldso/Makefile.in

@@ -35,7 +35,7 @@ LDFLAGS-$(UCLIBC_LDSO_NAME).so := $(LDFLAGS)
 else
 LDFLAGS-$(UCLIBC_LDSO_NAME).so := $(LDFLAGS_NOSTRIP) -Wl,-z,defs
 endif
-LDFLAGS-$(UCLIBC_LDSO_NAME).so += -Wl,-e,_start -Wl,-z,now -Wl,-Bsymbolic -Wl,--export-dynamic -Wl,--sort-common -Wl,--discard-locals -Wl,--discard-all -Wl,--no-undefined
+LDFLAGS-$(UCLIBC_LDSO_NAME).so += -Wl,-e,_start -Wl,-z,now -Wl,-Bsymbolic -Wl,--export-dynamic $(LDFLAG_SORT_COMMON) -Wl,--discard-locals $(LDFLAG_DISCARD_ALL) -Wl,--no-undefined
 
 ldso_FULL_NAME := $(UCLIBC_LDSO_NAME)-$(VERSION).so