[gcc r12-6870] Fortran: fix issignaling() implementation

[Franथईois-Xavier Coudert]

https://gcc.gnu.org/g:fa262add75ab6631bf22b7e2884437ba9c62ed2a

commit r12-6870-gfa262add75ab6631bf22b7e2884437ba9c62ed2a
Author: Francois-Xavier Coudert <fxcoudert@gmail.com>
Date:   Tue Jan 25 21:54:03 2022 +0100

    Fortran: fix issignaling() implementation
    
    libgfortran/ChangeLog:
    
            * ieee/issignaling_fallback.h: Fix GCC-specific preprocessor
            macros.

Diff:
---
 libgfortran/ieee/issignaling_fallback.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libgfortran/ieee/issignaling_fallback.h b/libgfortran/ieee/issignaling_fallback.h
index 5b9e1c88d6f..440a3f6c9a5 100644
--- a/libgfortran/ieee/issignaling_fallback.h
+++ b/libgfortran/ieee/issignaling_fallback.h
@@ -103,12 +103,12 @@ typedef union
   long double value;
   struct
   {
-#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
     int sign_exponent:16;
     unsigned int empty:16;
     uint32_t msw;
     uint32_t lsw;
-#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
     uint32_t lsw;
     uint32_t msw;
     int sign_exponent:16;
@@ -159,10 +159,10 @@ typedef union
   long double value;
   struct
   {
-#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
     uint64_t msw;
     uint64_t lsw;
-#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
     uint64_t lsw;
     uint64_t msw;
 #endif
@@ -204,10 +204,10 @@ typedef union
   __float128 value;
   struct
   {
-#if __FLOAT_WORD_ORDER == __BIG_ENDIAN
+#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__
     uint64_t msw;
     uint64_t lsw;
-#elif __FLOAT_WORD_ORDER == __LITTLE_ENDIAN
+#elif __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__
     uint64_t lsw;
     uint64_t msw;
 #endif