[clang] [Clang][Driver][Hurd] Enable __float128 support on x86 on Hurd (PR #153925)

[Pino Toscano via cfe-commits]

https://github.com/pinotree created https://github.com/llvm/llvm-project/pull/153925

It works fine, and this makes the Hurd driver more consistent with other drivers.

>From 9187bc22e1d65ac34644e1c1bf00bf55591ceec6 Mon Sep 17 00:00:00 2001
From: Pino Toscano <toscano.pino at tiscali.it>
Date: Sat, 16 Aug 2025 06:56:17 +0200
Subject: [PATCH] [Clang][Driver][Hurd] Enable __float128 support on x86 on
 Hurd

It works fine, and this makes the Hurd driver more consistent with other
drivers.
---
 clang/lib/Basic/Targets/OSTargets.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Basic/Targets/OSTargets.h b/clang/lib/Basic/Targets/OSTargets.h
index 94b018a0751d1..8d3e232dde1a5 100644
--- a/clang/lib/Basic/Targets/OSTargets.h
+++ b/clang/lib/Basic/Targets/OSTargets.h
@@ -325,9 +325,21 @@ class LLVM_LIBRARY_VISIBILITY HurdTargetInfo : public OSTargetInfo<Target> {
       Builder.defineMacro("_REENTRANT");
     if (Opts.CPlusPlus)
       Builder.defineMacro("_GNU_SOURCE");
+    if (this->HasFloat128)
+      Builder.defineMacro("__FLOAT128__");
   }
 public:
-  using OSTargetInfo<Target>::OSTargetInfo;
+  HurdTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : OSTargetInfo<Target>(Triple, Opts) {
+    switch (Triple.getArch()) {
+    default:
+      break;
+    case llvm::Triple::x86:
+    case llvm::Triple::x86_64:
+      this->HasFloat128 = true;
+      break;
+    }
+  }
 };
 
 // Linux target