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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99708] __SIZEOF_FLOAT128__ not defined on
 powerpc64le-linux
Date: Thu, 03 Mar 2022 15:39:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99708

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Maybe we could do this instead:

--- a/gcc/config/rs6000/rs6000-c.cc
+++ b/gcc/config/rs6000/rs6000-c.cc
@@ -623,11 +623,13 @@ rs6000_cpu_cpp_builtins (cpp_reader *pfile)
   if (TARGET_FRSQRTES)
     builtin_define ("__RSQRTEF__");
   if (TARGET_FLOAT128_TYPE)
+    {
       builtin_define ("__FLOAT128_TYPE__");
+      if (ieee128_float_type_node)
+       builtin_define ("__SIZEOF_FLOAT128__=3D16");
+    }
   if (ibm128_float_type_node)
     builtin_define ("__SIZEOF_IBM128__=3D16");
-  if (ieee128_float_type_node)
-    builtin_define ("__SIZEOF_FLOAT128__=3D16");
 #ifdef TARGET_LIBC_PROVIDES_HWCAP_IN_TCB
   builtin_define ("__BUILTIN_CPU_SUPPORTS__");
 #endif


It would be nice to add a test to the testsuite along the lines of:

/* { dg-do compile } */
#ifdef __SIZEOF_FLOAT128__
__float128 f;
#endif=