From 34cf3a95031408e747a0c904c0f98170d09244c6 Mon Sep 17 00:00:00 2001
From: Dennis <dkorpel@users.noreply.github.com>
Date: Wed, 19 Feb 2025 06:42:21 +0100
Subject: [PATCH] Fix #20894 (#20895)

- pragma(msg) interprets printf format specifiers
---
 compiler/src/dmd/pragmasem.d        | 2 +-
 compiler/test/compilable/bug11735.d | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/compiler/src/dmd/pragmasem.d b/compiler/src/dmd/pragmasem.d
index 3a455fb3d1..eb84d83705 100644
--- a/compiler/src/dmd/pragmasem.d
+++ b/compiler/src/dmd/pragmasem.d
@@ -568,7 +568,7 @@ private bool pragmaMsgSemantic(Loc loc, Scope* sc, Expressions* args)
     else
     {
         buf.writestring("\n");
-        fprintf(stderr, buf.extractChars);
+        fprintf(stderr, "%s", buf.extractChars);
     }
     return true;
 }
diff --git a/compiler/test/compilable/bug11735.d b/compiler/test/compilable/bug11735.d
index b94cb6e77d..be61a50585 100644
--- a/compiler/test/compilable/bug11735.d
+++ b/compiler/test/compilable/bug11735.d
@@ -13,6 +13,7 @@ print dstring
 foo_str
 foo_wstr
 foo_dstr
+X%nY
 ---
 */
 
@@ -33,4 +34,7 @@ void main()
     pragma(msg, a);
     pragma(msg, b);
     pragma(msg, c);
+
+    // https://github.com/dlang/dmd/issues/20894
+    pragma(msg, "X%nY");
 }