$NetBSD: patch-lib_Basic_Targets_OSTargets.h,v 1.4 2019/10/19 13:54:29 adam Exp $

Sync SunOS default defines with a working reality.

--- llvm-20.1.7.src/tools/clang/lib/Basic/Targets/OSTargets.h.orig
+++ llvm-20.1.7.src/tools/clang/lib/Basic/Targets/OSTargets.h
@@ -620,14 +620,15 @@
     Builder.defineMacro("__svr4__");
     Builder.defineMacro("__SVR4");
     Builder.defineMacro("_XOPEN_SOURCE", "600");
+    // Compatibility with GCC to satisfy <sys/feature_tests.h> requirements.
     if (Opts.CPlusPlus) {
-      Builder.defineMacro("__C99FEATURES__");
+      Builder.defineMacro("__STDC_VERSION__", "201112L");
       Builder.defineMacro("_FILE_OFFSET_BITS", "64");
+      Builder.defineMacro("_LARGEFILE_SOURCE");
+      Builder.defineMacro("_LARGEFILE64_SOURCE");
+      Builder.defineMacro("__EXTENSIONS__");
     }
     // GCC restricts the next two to C++.
-    Builder.defineMacro("_LARGEFILE_SOURCE");
-    Builder.defineMacro("_LARGEFILE64_SOURCE");
-    Builder.defineMacro("__EXTENSIONS__");
     if (Opts.POSIXThreads)
       Builder.defineMacro("_REENTRANT");
     if (this->HasFloat128)