[PATCH v2] libstdc++: Fix preprocessor check for __float128 formatter [PR119246]

[Tomasz Kamiński]

The previous check `_GLIBCXX_FORMAT_F128 != 1` was passing if
_GLIBCXX_FORMAT_F128 was not defined, i.e. evaluted to zero.

This broke sparc-sun-solaris2.11 and x86_64-darwin.

        PR libstdc++/119246

libstdc++-v3/ChangeLog:

        * include/std/format: Updated check for _GLIBCXX_FORMAT_F128.
---
 libstdc++-v3/include/std/format | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index f0b0252255d..bfda5895e0c 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -2973,7 +2973,7 @@ namespace __format
     };
 #endif
 
-#if defined(__SIZEOF_FLOAT128__) && _GLIBCXX_FORMAT_F128 != 1
+#if defined(__SIZEOF_FLOAT128__) && _GLIBCXX_FORMAT_F128 > 1
   // Reuse __formatter_fp<C>::format<__format::__flt128_t, Out> for __float128.
   // This formatter is not declared if _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT is 
true,
   // as __float128 when present is same type as __ieee128, which may be same as
-- 
2.49.0