From 9721d974fcd88cd522251568730d8de542cc8c4e Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@meta.com>
Date: Wed, 22 Oct 2025 12:34:47 -0700
Subject: [PATCH] Workaround ABI compatibility between clang and gcc

---
 include/fmt/base.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/fmt/base.h b/include/fmt/base.h
index e58a5d72..f407888e 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -923,7 +923,7 @@ class locale_ref {
  public:
   constexpr locale_ref() : locale_(nullptr) {}
 
-  template <typename Locale, FMT_ENABLE_IF(sizeof(Locale::collate) != 0)>
+  template <typename Locale, int = Locale::collate>
   locale_ref(const Locale& loc) : locale_(&loc) {
     // Check if std::isalpha is found via ADL to reduce the chance of misuse.
     isalpha('x', loc);