Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 454 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/config/pa/pa64-hpux.h b/gcc-4.9/gcc/config/pa/pa64-hpux.h
new file mode 100644
index 000000000..04b8de96e
--- /dev/null
+++ b/gcc-4.9/gcc/config/pa/pa64-hpux.h
@@ -0,0 +1,454 @@
+/* Definitions of target machine for GNU compiler, for HPs running
+   HPUX using the 64bit runtime model.
+   Copyright (C) 1999-2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* We can debug dynamically linked executables on hpux11; we also
+   want dereferencing of a NULL pointer to cause a SEGV.  Do not move
+   the "+Accept TypeMismatch" switch.  We check for it in collect2
+   to determine which init/fini is needed.  */
+#undef LINK_SPEC
+#if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
+#define LINK_SPEC \
+  "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
+     %nwarning: consider linking with '-static' as system libraries with\n\
+     %n  profiling support are only provided in archive format}}}\
+   %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
+     %nwarning: consider linking with '-static' as system libraries with\n\
+     %n  profiling support are only provided in archive format}}}\
+   %{!shared:%{!static:%{rdynamic:-E}}}\
+   %{mhp-ld:+Accept TypeMismatch -z} %{mlinker-opt:-O}\
+   %{!shared:-u main %{!nostdlib:%{!nodefaultlibs:-u __cxa_finalize}}}\
+   %{static:-a archive} %{shared:%{mhp-ld:-b}%{!mhp-ld:-shared}}"
+#else
+#define LINK_SPEC \
+  "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
+     %nwarning: consider linking with '-static' as system libraries with\n\
+     %n  profiling support are only provided in archive format}}}\
+   %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
+     %nwarning: consider linking with '-static' as system libraries with\n\
+     %n  profiling support are only provided in archive format}}}\
+   %{!shared:%{!static:%{rdynamic:-E}}}\
+   %{!mgnu-ld:+Accept TypeMismatch -z} %{mlinker-opt:-O}\
+   %{!shared:-u main %{!nostdlib:%{!nodefaultlibs:-u __cxa_finalize}}}\
+   %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}}"
+#endif
+
+/* Profiling support is only provided in libc.a.  However, libprof and
+   libgprof are only available in shared form on HP-UX 11.00.  We use
+   the shared form if we are using the GNU linker or an archive form
+   isn't available.  We also usually need to link with libdld and it's
+   only available in shared form.  */
+#undef LIB_SPEC
+#if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
+#define LIB_SPEC \
+  "%{!shared:\
+     %{!p:%{!pg:%{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+                  %{static:-a archive}}\
+	    %{mt|pthread:-lpthread} -lc\
+	    %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+     %{p:%{!pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
+	   -lprof %{static:-a archive}\
+	   %{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+             %{static:-a archive}}\
+	   %{mt|pthread:-lpthread} -lc\
+	   %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+     %{pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
+       -lgprof %{static:-a archive}\
+       %{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+         %{static:-a archive}}\
+       %{mt|pthread:-lpthread} -lc\
+       %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+   %{shared:%{mt|pthread:-lpthread}}"
+#else
+#define LIB_SPEC \
+  "%{!shared:\
+     %{!p:%{!pg:%{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+                  %{static:-a archive}}\
+	    %{mt|pthread:-lpthread} -lc\
+	    %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+     %{p:%{!pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
+	   -lprof %{static:-a archive}\
+	   %{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+             %{static:-a archive}}\
+	   %{mt|pthread:-lpthread} -lc\
+	   %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+     %{pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
+       -lgprof %{static:-a archive}\
+       %{fopenmp|ftree-parallelize-loops=*:%{static:-a shared} -lrt\
+         %{static:-a archive}}\
+       %{mt|pthread:-lpthread} -lc\
+       %{static:%{!nolibdld:-a shared -ldld -a archive -lc}\
+		%{!mt:%{!pthread:-a shared -lc -a archive}}}}}\
+   %{shared:%{mt|pthread:-lpthread}}"
+#endif
+
+/* The libgcc_stub.a and milli.a libraries need to come last.  */
+#undef LINK_GCC_C_SEQUENCE_SPEC
+#define LINK_GCC_C_SEQUENCE_SPEC "\
+  %G %L %G %{!nostdlib:%{!nodefaultlibs:%{!shared:-lgcc_stub}\
+  milli.a%s}}"
+
+/* Under hpux11, the normal location of the `ld' and `as' programs is the
+   /usr/ccs/bin directory.  */
+
+#ifndef CROSS_DIRECTORY_STRUCTURE
+#undef MD_EXEC_PREFIX
+#define MD_EXEC_PREFIX "/usr/ccs/bin"
+#endif
+
+/* Default prefixes.  */
+
+#undef STANDARD_STARTFILE_PREFIX_1
+#define STANDARD_STARTFILE_PREFIX_1 "/lib/pa20_64/"
+
+#undef STANDARD_STARTFILE_PREFIX_2
+#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/pa20_64/"
+
+/* Under hpux11 the normal location of the various pa20_64 *crt*.o files
+   is the /usr/ccs/lib/pa20_64 directory.  Some files may also be in the
+   /opt/langtools/lib/pa20_64 directory.  */
+
+#ifndef CROSS_DIRECTORY_STRUCTURE
+#undef MD_STARTFILE_PREFIX
+#define MD_STARTFILE_PREFIX "/usr/ccs/lib/pa20_64/"
+#endif
+
+#ifndef CROSS_DIRECTORY_STRUCTURE
+#undef MD_STARTFILE_PREFIX_1
+#define MD_STARTFILE_PREFIX_1 "/opt/langtools/lib/pa20_64/"
+#endif
+
+/* This macro specifies the biggest alignment supported by the object
+   file format of this machine.
+
+   The .align directive in the HP assembler allows alignments up to
+   4096 bytes.  However, the maximum alignment of a global common symbol
+   is 16 bytes using HP ld.  Unfortunately, this macro doesn't provide
+   a method to check for common symbols.  */
+#undef MAX_OFILE_ALIGNMENT
+#define MAX_OFILE_ALIGNMENT 32768
+
+/* Due to limitations in the target structure, it isn't currently possible
+   to dynamically switch between the GNU and HP assemblers.  */
+#undef TARGET_GAS
+
+/* Configure selects the standard ELFOS defines for use with GAS.  */
+#ifdef USING_ELFOS_H
+
+/* We are using GAS.  */
+#define TARGET_GAS 1
+
+#undef TARGET_ASM_FILE_START
+#define TARGET_ASM_FILE_START pa_hpux64_gas_file_start
+
+/* This is how we output a null terminated string.  */
+#undef STRING_ASM_OP
+#define STRING_ASM_OP	"\t.stringz\t"
+
+#define TEXT_SECTION_ASM_OP	"\t.text"
+#define DATA_SECTION_ASM_OP	"\t.data"
+#define BSS_SECTION_ASM_OP	"\t.section\t.bss"
+
+#define JCR_SECTION_NAME	".jcr"
+
+#define HP_INIT_ARRAY_SECTION_ASM_OP	"\t.section\t.init"
+#define GNU_INIT_ARRAY_SECTION_ASM_OP	"\t.section\t.init_array"
+#define HP_FINI_ARRAY_SECTION_ASM_OP	"\t.section\t.fini"
+#define GNU_FINI_ARRAY_SECTION_ASM_OP	"\t.section\t.fini_array"
+
+/* We need to override the following two macros defined in elfos.h since
+   the .comm directive has a different syntax and it can't be used for
+   local common symbols.  */
+#undef ASM_OUTPUT_ALIGNED_COMMON
+#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)		\
+  pa_asm_output_aligned_common (FILE, NAME, SIZE, ALIGN)
+
+#undef ASM_OUTPUT_ALIGNED_LOCAL
+#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)		\
+  pa_asm_output_aligned_local (FILE, NAME, SIZE, ALIGN)
+
+/* The define in pa.h doesn't work with the alias attribute.  The
+   default is ok with the following define for GLOBAL_ASM_OP.  */
+#undef TARGET_ASM_GLOBALIZE_LABEL
+
+/* This is how we globalize a label.  */
+#define GLOBAL_ASM_OP	"\t.globl\t"
+
+/* Hacked version from defaults.h that uses assemble_name_raw
+   instead of assemble_name.  A symbol in a type directive that
+   isn't otherwise referenced doesn't cause the symbol to be
+   placed in the symbol table of the assembled object.  */
+#undef ASM_OUTPUT_TYPE_DIRECTIVE
+#define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)		\
+do {								\
+  fputs (TYPE_ASM_OP, STREAM);					\
+  assemble_name_raw (STREAM, NAME);				\
+  fputs (", ", STREAM);						\
+  fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);			\
+  putc ('\n', STREAM);						\
+} while (0)
+
+/* Hacked version from elfos.h that doesn't output a label.  */
+#undef ASM_DECLARE_FUNCTION_NAME
+#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)		\
+do {								\
+  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");		\
+  ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));		\
+} while (0)
+
+/* The type of external references must be set correctly for the
+   dynamic loader to work correctly.  This is equivalent to the
+   HP assembler's .IMPORT directive but relates more directly to
+   ELF object file types.  */
+#undef ASM_OUTPUT_EXTERNAL
+#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)			\
+  pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
+#define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME)		\
+do {								\
+  if (FUNCTION_NAME_P (NAME))					\
+    ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");		\
+  else								\
+    ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");		\
+  default_elf_asm_output_external (FILE, DECL, NAME);		\
+} while (0)
+
+/* We need set the type for external libcalls.  Also note that not all
+   libcall names are passed to targetm.encode_section_info (e.g., __main).
+   Thus, we also have to do the section encoding if it hasn't been done
+   already.  */
+#undef ASM_OUTPUT_EXTERNAL_LIBCALL
+#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)			\
+do {								\
+  if (!FUNCTION_NAME_P (XSTR (FUN, 0)))				\
+    pa_encode_label (FUN);					\
+  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");	\
+} while (0)
+
+/* We need to use the HP style for internal labels.  */
+#undef ASM_GENERATE_INTERNAL_LABEL
+#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)	\
+  sprintf (LABEL, "*%c$%s%04ld", (PREFIX)[0], (PREFIX) + 1, (long)(NUM))
+
+#else /* USING_ELFOS_H */
+
+/* We are not using GAS.  */
+#define TARGET_GAS 0
+
+/* HPUX 11 has the "new" HP assembler.  It's still lousy, but it's a whole
+   lot better than the assembler shipped with older versions of hpux.
+   However, it doesn't support weak symbols and is a bad fit with ELF.  */
+#undef NEW_HP_ASSEMBLER
+#define NEW_HP_ASSEMBLER 1
+
+/* It looks like DWARF2 will be the easiest debug format to handle on this
+   platform.  */
+#define DWARF2_DEBUGGING_INFO 1
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+
+/* This target uses the ELF object file format.  */
+#define OBJECT_FORMAT_ELF
+
+#undef TARGET_ASM_FILE_START
+#define TARGET_ASM_FILE_START pa_hpux64_hpas_file_start
+
+#undef TEXT_SECTION_ASM_OP
+#define TEXT_SECTION_ASM_OP		"\t.SUBSPA $CODE$\n"
+#undef READONLY_DATA_SECTION_ASM_OP
+#define READONLY_DATA_SECTION_ASM_OP	"\t.SUBSPA $LIT$\n"
+#undef DATA_SECTION_ASM_OP
+#define DATA_SECTION_ASM_OP		"\t.SUBSPA $DATA$\n"
+#undef BSS_SECTION_ASM_OP
+#define BSS_SECTION_ASM_OP		"\t.SUBSPA $BSS$\n"
+
+/* We provide explicit defines for CTORS_SECTION_ASM_OP and
+   DTORS_SECTION_ASM_OP since we don't yet have support for
+   named sections with the HP assembler.  */
+#undef CTORS_SECTION_ASM_OP
+#define CTORS_SECTION_ASM_OP "\t.SUBSPA \\.ctors,QUAD=1,ALIGN=8,ACCESS=31"
+#undef DTORS_SECTION_ASM_OP
+#define DTORS_SECTION_ASM_OP "\t.SUBSPA \\.dtors,QUAD=1,ALIGN=8,ACCESS=31"
+
+#define HP_INIT_ARRAY_SECTION_ASM_OP \
+  "\t.SUBSPA \\.init,QUAD=1,ALIGN=8,ACCESS=31"
+#define GNU_INIT_ARRAY_SECTION_ASM_OP \
+  "\t.SUBSPA \\.init_array,QUAD=1,ALIGN=8,ACCESS=31"
+#define HP_FINI_ARRAY_SECTION_ASM_OP \
+  "\t.SUBSPA \\.fini,QUAD=1,ALIGN=8,ACCESS=31"
+#define GNU_FINI_ARRAY_SECTION_ASM_OP \
+  "\t.SUBSPA \\.fini_array,QUAD=1,ALIGN=8,ACCESS=31"
+
+#endif /* USING_ELFOS_H */
+
+/* The following defines, used to run constructors and destructors with
+   the SOM linker under HP-UX 11, are not needed.  */
+#undef HAS_INIT_SECTION
+#undef LD_INIT_SWITCH
+#undef LD_FINI_SWITCH
+
+/* The following STARTFILE_SPEC and ENDFILE_SPEC defines provide the
+   magic needed to run initializers and finalizers.  */
+#undef STARTFILE_SPEC
+#if TARGET_HPUX_11_31
+#define STARTFILE_SPEC \
+  "%{!shared: %{!symbolic: crt0%O%s} \
+     %{munix=95:unix95.o%s} %{munix=98:unix98.o%s} \
+     %{!munix=93:%{!munix=95:%{!munix=98:unix2003%O%s}}}} \
+     %{static:crtbeginT%O%s} \
+   %{!static:%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
+#elif TARGET_HPUX_11_11
+#define STARTFILE_SPEC \
+  "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95.o%s} \
+     %{!munix=93:%{!munix=95:unix98%O%s}}} %{static:crtbeginT%O%s} \
+   %{!static:%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
+#else
+#define STARTFILE_SPEC \
+  "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95%O%s}} \
+   %{static:crtbeginT%O%s} %{!static:%{!shared:crtbegin%O%s} \
+   %{shared:crtbeginS%O%s}}"
+#endif
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
+
+/* Since HP uses the .init and .fini sections for array initializers
+   and finalizers, we need different defines for INIT_SECTION_ASM_OP
+   and FINI_SECTION_ASM_OP.  With the implementation adopted below,
+   the sections are not actually used.  However, we still must provide
+   defines to select the proper code path.  */
+#undef INIT_SECTION_ASM_OP
+#define INIT_SECTION_ASM_OP
+#undef FINI_SECTION_ASM_OP
+#define FINI_SECTION_ASM_OP
+
+/* We are using array initializers and don't want calls in the INIT
+   and FINI sections.  */
+#undef CRT_CALL_STATIC_FUNCTION
+#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)
+
+/* The init_priority attribute is not supported with HP ld.  This could be
+   supported if collect2 was used with LD_INIT_SWITCH.  Unfortunately, this
+   approach doesn't work with GNU ld since HP-UX doesn't support DT_INIT,
+   and therefore the -init and -fini GNU ld switches.  */
+#undef SUPPORTS_INIT_PRIORITY
+#define SUPPORTS_INIT_PRIORITY (TARGET_GNU_LD ? 1 : 0)
+
+/* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use
+   the init and fini array sections with both the HP and GNU linkers.
+   The linkers setup the required dynamic entries in the dynamic segment
+   and the dynamic linker does the calls.  This approach avoids using
+   collect2.
+
+   The first hack is to implement __do_global_ctors_aux in crtbegin as
+   it needs to be the first entry in the init array so that it is called
+   last.  HP got the order of the init array backwards.  The DT_INIT_ARRAY
+   is supposed to be executed in the same order as the addresses appear in
+   the array.  DT_FINI_ARRAY is supposed to be executed in the opposite
+   order.
+
+   The second hack is a set of plabels to implement the effect of
+   CRT_CALL_STATIC_FUNCTION.  HP-UX 11 only supports DI_INIT_ARRAY and
+   DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than
+   in .init_array and .fini_array.  The standard defines for .init and
+   .fini have the execute flag set.  So, the assembler has to be hacked
+   to munge the standard flags for these sections to make them agree
+   with what the HP linker expects.  With the GNU linker, we need to
+   used the .init_array and .fini_array sections.  So, we set up for
+   both just in case.  Once we have built the table, the linker does
+   the rest of the work.
+
+   The order is significant.  Placing __do_global_ctors_aux first in
+   the list, results in it being called last.  User specified initializers,
+   either using the linker +init command or a plabel, run before the
+   initializers specified here.  */
+
+/* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME
+   or JCR_SECTION_NAME is defined.  */
+#if defined(EH_FRAME_SECTION_NAME) || defined(JCR_SECTION_NAME)
+#define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy"
+#else
+#define PA_INIT_FRAME_DUMMY_ASM_OP ""
+#endif
+
+/* The following hack sets up the .init, .init_array, .fini and
+   .fini_array sections.  */
+#define PA_CRTBEGIN_HACK \
+asm (TEXT_SECTION_ASM_OP);						\
+static void __attribute__((used))					\
+__do_global_ctors_aux (void)						\
+{									\
+  func_ptr *p = __CTOR_LIST__;						\
+  while (*(p + 1))							\
+    p++;								\
+  for (; *p != (func_ptr) -1; p--)					\
+    (*p) ();								\
+}									\
+									\
+asm (HP_INIT_ARRAY_SECTION_ASM_OP);					\
+asm (".align 8");							\
+asm (".dword P%__do_global_ctors_aux");					\
+asm (PA_INIT_FRAME_DUMMY_ASM_OP);					\
+asm (GNU_INIT_ARRAY_SECTION_ASM_OP);					\
+asm (".align 8");							\
+asm (".dword P%__do_global_ctors_aux");					\
+asm (PA_INIT_FRAME_DUMMY_ASM_OP);					\
+asm (HP_FINI_ARRAY_SECTION_ASM_OP);					\
+asm (".align 8");							\
+asm (".dword P%__do_global_dtors_aux");					\
+asm (GNU_FINI_ARRAY_SECTION_ASM_OP);					\
+asm (".align 8");							\
+asm (".dword P%__do_global_dtors_aux")
+
+/* The following two variants of DTOR_LIST_BEGIN are identical to those
+   in crtstuff.c except for the addition of the above crtbegin hack.  */
+#ifdef DTORS_SECTION_ASM_OP
+#define DTOR_LIST_BEGIN \
+asm (DTORS_SECTION_ASM_OP);						\
+STATIC func_ptr __DTOR_LIST__[1]					\
+  __attribute__ ((aligned(sizeof(func_ptr))))				\
+  = { (func_ptr) (-1) };						\
+PA_CRTBEGIN_HACK
+#else
+#define DTOR_LIST_BEGIN \
+STATIC func_ptr __DTOR_LIST__[1]					\
+  __attribute__ ((section(".dtors"), aligned(sizeof(func_ptr))))	\
+  = { (func_ptr) (-1) };						\
+PA_CRTBEGIN_HACK
+#endif
+
+/* If using HP ld do not call pxdb.  Use size as a program that does nothing
+   and returns 0.  /bin/true cannot be used because it is a script without
+   an interpreter.  */
+#define INIT_ENVIRONMENT "LD_PXDB=/usr/ccs/bin/size"
+
+/* The HPUX dynamic linker objects to undefined weak symbols, so do
+   not use them in gthr-posix.h.  */
+#define GTHREAD_USE_WEAK 0
+
+/* We don't want undefined weak references to __register_frame_info,
+   __deregister_frame_info, _Jv_RegisterClasses and __cxa_finalize
+   introduced by crtbegin.o.  The GNU linker only resolves weak
+   references if they appear in a shared library.  Thus, it would be
+   impossible to create a static executable if the symbols were weak.
+   So, the best solution seems to be to make the symbols strong and
+   provide an archive library of empty stub functions.  */
+#define TARGET_ATTRIBUTE_WEAK