build: ease DragonFlyBSD build

Implicitly pretending being FreeBSD and disable
large pages for this platform.

PR-URL: #30201
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/debug_utils.cc

@@ -26,10 +26,10 @@
 #endif  // __POSIX__
 
 #if defined(__linux__) || defined(__sun) || \
-    defined(__FreeBSD__) || defined(__OpenBSD__)
+    defined(__FreeBSD__) || defined(__OpenBSD__) || \
+    defined(__DragonFly__)
 #include <link.h>
-#endif  // (__linux__) || defined(__sun) ||
-        // (__FreeBSD__) || defined(__OpenBSD__)
+#endif
 
 #ifdef __APPLE__
 #include <mach-o/dyld.h>  // _dyld_get_image_name()
@@ -337,7 +337,8 @@ void PrintLibuvHandleInformation(uv_loop_t* loop, FILE* stream) {
 
 std::vector<std::string> NativeSymbolDebuggingContext::GetLoadedLibraries() {
   std::vector<std::string> list;
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#if defined(__linux__) || defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || defined(__DragonFly__)
   dl_iterate_phdr(
       [](struct dl_phdr_info* info, size_t size, void* data) {
         auto list = static_cast<std::vector<std::string>*>(data);

tools/utils.py

@@ -63,6 +63,10 @@ def GuessOS():
     return 'solaris'
   elif id == 'NetBSD':
     return 'netbsd'
+  elif id == 'DragonFly':
+    # Doing so on purpose as they are pretty close
+    # minus few features
+    return 'freebsd'
   elif id == 'AIX':
     return 'aix'
   else: