libunwind related patch from David Mosberger

libunwind related patch from David Mosberger
* unwind-libunwind.c (_Unwind_SetGR): Clear the NaT bit as
required by C++ ABI for Itanium.
* config/t-libunwind (LIB2ADDEH): Remove unwind-libunwind.c.
* config/t-libunwind-no-eh: New file.
* configure.in: Check libunwind for _Unwind_Resume() and if it's
present, set libunwind_has_eh_support to "yes".
* configure: Regenerate.
* config.gcc (ia64*-*-linux*): If $libunwind_has_eh_support is
set to yes, use t-libunwind, otherwise, use t-libunwind-no-eh.

From-SVN: r74548

gcc/ChangeLog

+2003-12-11  David Mosberger  <davidm@hpl.hp.com>
+
+	* unwind-libunwind.c (_Unwind_SetGR): Clear the NaT bit as
+	required by C++ ABI for Itanium.
+	* config/t-libunwind (LIB2ADDEH): Remove unwind-libunwind.c.
+	* config/t-libunwind-no-eh: New file.
+	* configure.in: Check libunwind for _Unwind_Resume() and if it's
+	present, set libunwind_has_eh_support to "yes".
+	* configure: Regenerate.
+	* config.gcc (ia64*-*-linux*): If $libunwind_has_eh_support is
+	set to yes, use t-libunwind, otherwise, use t-libunwind-no-eh.
+
 2003-12-11  Richard Sandiford  <rsandifo@redhat.com>
 
 	* config/mips/mips.c (mips_global_pointer): Force functions with

gcc/config.gcc

@@ -1245,7 +1245,11 @@ ia64*-*-linux*)
 	target_cpu_default="MASK_GNU_AS|MASK_GNU_LD"
 	extra_parts="crtbegin.o crtend.o crtbeginS.o crtendS.o crtfastmath.o"
 	if test x"$use_libunwind_exceptions" = xyes; then
-	  tmake_file="$tmake_file t-libunwind"
+	  if test x"$libunwind_has_eh_support" = xyes; then
+	    tmake_file="$tmake_file t-libunwind"
+	  else
+	    tmake_file="$tmake_file t-libunwind-no-eh"
+	  fi
 	fi
 	;;
 ia64*-*-hpux*)

gcc/config/t-libunwind

@@ -2,5 +2,4 @@
 # so that the resulting libgcc_s.so has the necessary DT_NEEDED entry for
 # libunwind.
 SHLIB_LC = -lunwind -lc
-LIB2ADDEH = $(srcdir)/unwind-libunwind.c $(srcdir)/unwind-sjlj.c \
-	    $(srcdir)/unwind-c.c
+LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c

gcc/config/t-libunwind-no-eh

+# Override the default value from t-slibgcc-elf-ver and mention -lunwind
+# so that the resulting libgcc_s.so has the necessary DT_NEEDED entry for
+# libunwind.
+SHLIB_LC = -lunwind -lc
+LIB2ADDEH = $(srcdir)/unwind-libunwind.c $(srcdir)/unwind-sjlj.c \
+	    $(srcdir)/unwind-c.c

gcc/configure.in

@@ -957,6 +957,8 @@ use_libunwind_exceptions=$use_libunwind_default)
 if test x"$use_libunwind_exceptions" = xyes; then
    AC_DEFINE(USE_LIBUNWIND_EXCEPTIONS, 1,
 	[Define if gcc should use -lunwind.])
+   AC_CHECK_LIB(unwind, _Unwind_Resume, libunwind_has_eh_support=yes,
+	libunwind_has_eh_support=no)
 fi
 
 # --------------------------------------------------------

gcc/unwind-libunwind.c

@@ -124,6 +124,11 @@ _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
   /* Note: here we depend on the fact that general registers are
      expected to start with register number 0!  */
   unw_set_reg (&context->cursor, index, val);
+#ifdef UNW_TARGET_IA64
+  if (index >= UNW_IA64_GR && index <= UNW_IA64_GR + 127)
+    /* Clear the NaT bit. */
+    unw_set_reg (&context->cursor, UNW_IA64_NAT + (index - UNW_IA64_GR), 0);
+#endif
 }
 
 /* Retrieve the return address for CONTEXT.  */