tools/mtd-utils: avoid linking libm statically

Rework static linker flags to not link libm statically, this should fix the
build on CentOS where libm.a is not provided by the libc devel package.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 46989

tools/mtd-utils/patches/310-add-static-linking-option.patch

@@ -1,23 +1,43 @@
 --- a/common.mk
 +++ b/common.mk
-@@ -2,6 +2,11 @@ CC := $(CROSS)gcc
+@@ -2,6 +2,16 @@ CC := $(CROSS)gcc
  AR := $(CROSS)ar
  RANLIB := $(CROSS)ranlib
  
 +ifeq ($(STATIC),1)
-+  LD_STATIC_ON := -Wl,-Bstatic
-+  LD_STATIC_OFF := -Wl,-Bdynamic
++ define static_link
++  -Wl,-Bstatic $(1) -Wl,-Bdynamic
++ endef
++else
++ define static_link
++  $(1)
++ endef
 +endif
 +
  # Stolen from Linux build system
  comma = ,
  try-run = $(shell set -e; ($(1)) >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
-@@ -68,7 +73,7 @@ endef
+--- a/Makefile
++++ b/Makefile
+@@ -89,10 +89,10 @@ obj-mkfs.jffs2 = compr_rtime.o compr_zli
+ 	compr_lzma.o lzma/LzFind.o lzma/LzmaEnc.o lzma/LzmaDec.o \
+ 	compr.o rbtree.o
+ LDFLAGS_mkfs.jffs2 = $(ZLIBLDFLAGS) $(LZOLDFLAGS)
+-LDLIBS_mkfs.jffs2  = -lz $(LZOLDLIBS)
++LDLIBS_mkfs.jffs2  = $(call static_link,-lz $(LZOLDLIBS))
  
- %: %.o $(LDDEPS)
- 	$(call BECHO,LD)
--	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(LDFLAGS_$(notdir $@)) -g -o $@ $^ $(LDLIBS) $(LDLIBS_$(notdir $@))
-+	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(LDFLAGS_$(notdir $@)) -g -o $@ $(LD_STATIC_ON) $^ $(LDLIBS) $(LDLIBS_$(notdir $@)) $(LD_STATIC_OFF)
+ LDFLAGS_jffs2reader = $(ZLIBLDFLAGS) $(LZOLDFLAGS)
+-LDLIBS_jffs2reader  = -lz $(LZOLDLIBS)
++LDLIBS_jffs2reader  = $(call static_link,-lz $(LZOLDLIBS))
  
- $(BUILDDIR)/%.a:
- 	$(call BECHO,AR)
+ $(foreach v,$(MTD_BINS),$(eval $(call mkdep,,$(v))))
+ 
+@@ -119,7 +119,7 @@ else
+   XZLDLIBS = -llzma
+ endif
+ 
+-LDLIBS_mkfs.ubifs = -lz $(LZOLDLIBS) $(XZLDLIBS) -lm -luuid
++LDLIBS_mkfs.ubifs = $(call static_link,-lz $(LZOLDLIBS) $(XZLDLIBS)) -lm $(call static_link,-luuid)
+ $(call mkdep,mkfs.ubifs/,mkfs.ubifs,,ubi-utils/libubi.a)
+ 
+ #