[Bug target/99708] __SIZEOF_FLOAT128__ not defined on powerpc64le-linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99708

--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So what about:
--- gcc/config/rs6000/rs6000-c.cc.jj    2022-02-17 10:24:16.756113275 +0100
+++ gcc/config/rs6000/rs6000-c.cc       2022-03-03 19:06:25.771981905 +0100
@@ -584,6 +584,10 @@ rs6000_target_modify_macros (bool define
        rs6000_define_or_undefine_macro (true, "__float128=__ieee128");
       else
        rs6000_define_or_undefine_macro (false, "__float128");
+      if (ibm128_float_type_node != ieee128_float_type_node && define_p)
+       rs6000_define_or_undefine_macro (true, "__SIZEOF_FLOAT128__=16");
+      else
+       rs6000_define_or_undefine_macro (false, "__SIZEOF_FLOAT128__");
     }
   /* OPTION_MASK_FLOAT128_HARDWARE can be turned on if -mcpu=power9 is used or
      via the target attribute/pragma.  */
@@ -623,11 +627,9 @@ rs6000_cpu_cpp_builtins (cpp_reader *pfi
   if (TARGET_FRSQRTES)
     builtin_define ("__RSQRTEF__");
   if (TARGET_FLOAT128_TYPE)
-      builtin_define ("__FLOAT128_TYPE__");
-  if (ibm128_float_type_node)
+    builtin_define ("__FLOAT128_TYPE__");
+  if (ibm128_float_type_node != ieee128_float_type_node)
     builtin_define ("__SIZEOF_IBM128__=16");
-  if (ieee128_float_type_node)
-    builtin_define ("__SIZEOF_FLOAT128__=16");
 #ifdef TARGET_LIBC_PROVIDES_HWCAP_IN_TCB
   builtin_define ("__BUILTIN_CPU_SUPPORTS__");
 #endif

?