[PATCH] Check endianess detection.

[Martin Liška]

Hi.

As seen in the PR, sparc64 LTO test-suite fails due to missing
definition of __BIG_ENDIAN__ macro. That said, I updated the
endianess detection to use __BYTE_ORDER__.

I tested the detection on x86_64-linux-gnu, ppc64-linux-gnu and
lto.exp testsuite survives on a sparc64-linux machine.

Ready to be installed?
Thanks,
Martin

include/ChangeLog:

2020-03-23  Martin Liska  <mli...@suse.cz>

        PR lto/94249
        * plugin-api.h: Use __BYTE_ORDER__ instead of __BIG_ENDIAN__
        which is not defined on sparc64 target.
---
 include/plugin-api.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)



diff --git a/include/plugin-api.h b/include/plugin-api.h
index 673f136ce68..5a45ce773f7 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -89,16 +89,18 @@ struct ld_plugin_symbol
   char *version;
   /* This is for compatibility with older ABIs.  The older ABI defined
      only 'def' field.  */
-#ifdef __BIG_ENDIAN__
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
   char unused;
   char section_kind;
   char symbol_type;
   char def;
-#else
+#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
   char def;
   char symbol_type;
   char section_kind;
   char unused;
+#else
+#error "Could not detect architecture endianess"
 #endif
   int visibility;
   uint64_t size;