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Makefile: strip debugging informations only

--strip-unneeded causes SIGSEGV when accessing g_executable_path. So
test_libvpx crashes due to SIGSEGV in ::testing::InitGoogleTest().

OS/2, aout, strip v2.23.2

Change-Id: I2718d082447ee0d9ad0c021b9156c50e1ac085a6

--- a/build/make/Makefile

+++ b/build/make/Makefile

@@ -196,13 +196,13 @@

 # the copy implementation

 HAVE_GNU_STRIP := $(if $(CONFIG_DEBUG),,$(HAVE_GNU_STRIP))

 ifeq ($(HAVE_GNU_STRIP),yes)

-# Older binutils strip global sybols not needed for relocation processing

-# when given --strip-unneeded. Use nm and awk to identify globals and

-# keep them.

+# Older binutils strip global symbols not needed for relocation processing

+# when given --strip-unneeded. Using nm and awk to identify globals and

+# keep them caused command line length issues under mingw and segfaults in

+# test_libvpx were observed under OS/2: simply use --strip-debug.

 %.a: %_g.a

 	$(if $(quiet),@echo "    [STRIP] $@ < $<")

-	$(qexec)$(STRIP) --strip-unneeded \

-         `$(NM) $< | grep ' [A-TV-Z] ' | awk '{print "-K"$$3'}`\

+	$(qexec)$(STRIP) --strip-debug \

           -o $@ $<

 else

 %.a: %_g.a