From 027fc03e93fc2ea0fc8ed7a49f4130b884db583a Mon Sep 17 00:00:00 2001
From: Christoph Froehlich <christoph.froehlich@ait.ac.at>
Date: Sun, 22 Mar 2026 21:11:49 +0000
Subject: [PATCH] FIx invalid preprocessor command 'warning' on MSVC

---
 tl_expected/include/tl_expected/expected.hpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tl_expected/include/tl_expected/expected.hpp b/tl_expected/include/tl_expected/expected.hpp
index 2af2e7a..3c7f98e 100644
--- a/tl_expected/include/tl_expected/expected.hpp
+++ b/tl_expected/include/tl_expected/expected.hpp
@@ -13,7 +13,13 @@
 // <http://creativecommons.org/publicdomain/zero/1.0/>.
 ///
 
-#warning "tl_expected/expected.hpp is deprecated. Use <tl/expected.hpp> from libexpected-dev, or <rcpputils/tl_expected/expected.hpp> if the system header is not available."
+#ifdef _WIN32
+#pragma message( \
+  "tl_expected/expected.hpp is deprecated. Use <tl/expected.hpp> from libexpected-dev, or <rcpputils/tl_expected/expected.hpp> if the system header is not available.")   // NOLINT
+#else
+#warning \
+  "tl_expected/expected.hpp is deprecated. Use <tl/expected.hpp> from libexpected-dev, or <rcpputils/tl_expected/expected.hpp> if the system header is not available."   // NOLINT
+#endif
 // If the system header is available, redirect to it.
 // Otherwise, fall back to the vendored version
 #if __has_include(<tl/expected.hpp>)