From 78f4620b96bc4408f7f7a9b2aa4e1041a119c2ac Mon Sep 17 00:00:00 2001
From: Joel Rosdahl <joel@rosdahl.net>
Date: Fri, 5 Sep 2025 20:56:13 +0200
Subject: [PATCH] ci: Fix ccache version for PR workflows

---
 cmake/CcacheVersion.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmake/CcacheVersion.cmake b/cmake/CcacheVersion.cmake
index f9541e42..111d5c66 100644
--- a/cmake/CcacheVersion.cmake
+++ b/cmake/CcacheVersion.cmake
@@ -43,7 +43,11 @@ elseif(DEFINED ENV{GITHUB_REF})
     set(CCACHE_VERSION "${CMAKE_MATCH_1}")
   else()
     string(SUBSTRING "$ENV{GITHUB_SHA}" 0 8 hash)
-    set(CCACHE_VERSION "$ENV{GITHUB_REF_NAME}.${hash}")
+    if("$ENV{GITHUB_REF}" MATCHES "^refs/pull/(.+)/merge$")
+      set(CCACHE_VERSION "pr.${CMAKE_MATCH_1}.${hash}")
+    else()
+      set(CCACHE_VERSION "$ENV{GITHUB_REF_NAME}.${hash}")
+    endif()
   endif()
 elseif(EXISTS "${CMAKE_SOURCE_DIR}/.git")
   # Scenario 4.
-- 
2.47.3