NetBSD/libgcc: Check for TARGET_DL_ITERATE_PHDR in the unwinder

Disable USE_PT_GNU_EH_FRAME frame unwinder support for old OS versions,
fixing compilation errors:

.../libgcc/unwind-dw2-fde-dip.c:75:21: error: unknown type name 'Elf_Phdr'
   75 | # define ElfW(type) Elf_##type
      |                     ^~~~
.../libgcc/unwind-dw2-fde-dip.c:132:9: note: in expansion of macro 'ElfW'
  132 |   const ElfW(Phdr) *p_eh_frame_hdr;
      |         ^~~~
.../libgcc/unwind-dw2-fde-dip.c:75:21: error: unknown type name 'Elf_Phdr'
   75 | # define ElfW(type) Elf_##type
      |                     ^~~~
.../libgcc/unwind-dw2-fde-dip.c:133:9: note: in expansion of macro 'ElfW'
  133 |   const ElfW(Phdr) *p_dynamic;
      |         ^~~~
.../libgcc/unwind-dw2-fde-dip.c:165:37: warning: 'struct dl_phdr_info' declared inside parameter list will not be visible outside of this definition or declaration
  165 | _Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
      |                                     ^~~~~~~~~~~~
[...]

and producing a working cross-compiler at least with VAX/NetBSD 1.6.2.

	libgcc/
	* unwind-dw2-fde-dip.c [__OpenBSD__ || __NetBSD__]
	(USE_PT_GNU_EH_FRAME): Do not define if !TARGET_DL_ITERATE_PHDR.

diff --git a/libgcc/unwind-dw2-fde-dip.c b/libgcc/unwind-dw2-fde-dip.c
index 6e50405da08f675af61461a87c3af3cfb9b562b5..e60c9fea34ac8dd7fdeb6fcaf124c37cabec0461 100644 (file)
--- a/libgcc/unwind-dw2-fde-dip.c
+++ b/libgcc/unwind-dw2-fde-dip.c
@@ -71,6 +71,7 @@
 #endif
 
 #if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
+    && defined(TARGET_DL_ITERATE_PHDR) \
     && (defined(__OpenBSD__) || defined(__NetBSD__))
 # define ElfW(type) Elf_##type
 # define USE_PT_GNU_EH_FRAME