[gcc r15-11481] libstdc++: Fix preprocessor check for bfloat16_t in <numbers> [PR126849]

[Jonathan Wakely]

https://gcc.gnu.org/g:0176d8df3e6b4008f8354a5eaa0c2b2c74cd37ca

commit r15-11481-g0176d8df3e6b4008f8354a5eaa0c2b2c74cd37ca
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Aug 17 14:09:16 2026 +0100

    libstdc++: Fix preprocessor check for bfloat16_t in <numbers> [PR126849]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/126849
            * include/std/numbers: Fix preprocessor check for
            std::bfloat16_t support.
    
    (cherry picked from commit 92bcc711fafc026e0cc2f48b7f3ab23657787a8c)

Diff:
---
 libstdc++-v3/include/std/numbers | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/numbers b/libstdc++-v3/include/std/numbers
index f4c45a4281eb..c6efcf37bdec 100644
--- a/libstdc++-v3/include/std/numbers
+++ b/libstdc++-v3/include/std/numbers
@@ -222,7 +222,7 @@ __glibcxx_numbers (_Float64, F64);
 __glibcxx_numbers (_Float128, F128);
 #endif
 
-#ifdef __STDCPP_BFLOAT128_T__
+#ifdef __STDCPP_BFLOAT16_T__
 __glibcxx_numbers (__gnu_cxx::__bfloat16_t, BF16);
 #endif