From 49f84082765c030d9361312db5539e9845e8588e Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Sun, 12 Jul 2026 12:00:01 +0100
Subject: [PATCH] Make float128 support detection more robust. Fixes
 https://github.com/boostorg/config/issues/503

---
 include/boost/config/compiler/gcc.hpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/boost/config/compiler/gcc.hpp b/include/boost/config/compiler/gcc.hpp
index ab7cfe6a..f2714821 100644
--- a/include/boost/config/compiler/gcc.hpp
+++ b/include/boost/config/compiler/gcc.hpp
@@ -167,7 +167,13 @@
 #include <stddef.h>
 #endif
 #if defined(_GLIBCXX_USE_FLOAT128) && !defined(__STRICT_ANSI__) && !defined(BOOST_NVCC_CXX03)
-# define BOOST_HAS_FLOAT128
+#if defined(__has_include)
+#if __has_include(<quadmath.h>)
+#  define BOOST_HAS_FLOAT128
+#endif
+#else
+#  define BOOST_HAS_FLOAT128
+#endif
 #endif
 
 // C++0x features in 4.3.n and later