Fix ARM crti.o/crtn.o unwind tables issue

[Joseph S. Myers]

I've applied this patch, a followup fix to the ARM backtrace changes, to 
fix an issue building crti.o and crtn.o with unwind tables enabled by 
default.  I quote Paul's description of the issue and fix:

    The crti.o and crtn.o objects are generated by compiling a function, then 
    splitting the assembly in two. Some ARM EABI toolchains enable unwinding 
    tables by default. This adds additional directives to the assembly which break 
    when post-processed into separate files.

    The patch below fixes this by disabling unwinding tables for these files. 

diff --git a/ChangeLog.arm b/ChangeLog.arm
index ebc4e30..47aa61d 100644
--- a/ChangeLog.arm
+++ b/ChangeLog.arm
@@ -1,3 +1,9 @@
+2009-06-30  Paul Brook  <paul@codesourcery.com>
+
+	* sysdeps/arm/eabi/Makefile (CFLAGS-initfini.s): Add
+	-fno-asynchronous-unwind-tables -fno-unwind-tables.
+	(CFLAGS-pt-initfini.s): Ditto.
+
 2009-06-25  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* sysdeps/arm/eabi/aeabi_lcsts.c (__aeabi_stdin, __aeabi_stdout,
diff --git a/sysdeps/arm/eabi/Makefile b/sysdeps/arm/eabi/Makefile
index 890d1d9..05aede6 100644
--- a/sysdeps/arm/eabi/Makefile
+++ b/sysdeps/arm/eabi/Makefile
@@ -3,6 +3,7 @@ aeabi_constants = aeabi_lcsts aeabi_sighandlers aeabi_math
 aeabi_routines = aeabi_assert aeabi_localeconv aeabi_errno_addr \
 	aeabi_mb_cur_max aeabi_atexit aeabi_memclr aeabi_memcpy \
 	aeabi_memmove aeabi_memset
+CFLAGS-initfini.s += -fno-asynchronous-unwind-tables -fno-unwind-tables
 
 sysdep_routines += $(aeabi_constants) $(aeabi_routines)
 static-only-routines += $(aeabi_constants)
@@ -24,3 +25,7 @@ endif
 ifeq ($(subdir),math)
 $(objpfx)libm.so: $(elfobjdir)/ld.so
 endif
+
+ifeq ($(subdir),nptl)
+CFLAGS-pt-initfini.s += -fno-asynchronous-unwind-tables -fno-unwind-tables
+endif

-- 
Joseph S. Myers
joseph@codesourcery.com