From cf4270c052dd5c59c336a78231319d57c7d2b24c Mon Sep 17 00:00:00 2001
From: Christoph Cullmann <cullmann@kde.org>
Date: Thu, 21 Jan 2021 21:55:10 +0000
Subject: ignore source files in CMAKE_BINARY_DIR for clang-format target

---
 kde-modules/KDEClangFormat.cmake | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/kde-modules/KDEClangFormat.cmake b/kde-modules/KDEClangFormat.cmake
index 7f85508b..6cdbd2b5 100644
--- a/kde-modules/KDEClangFormat.cmake
+++ b/kde-modules/KDEClangFormat.cmake
@@ -45,18 +45,24 @@ function(KDE_CLANG_FORMAT)
 
     # run clang-format only if available, else signal the user what is missing
     if(KDE_CLANG_FORMAT_EXECUTABLE)
+        get_filename_component(_binary_dir ${CMAKE_BINARY_DIR} REALPATH)
         foreach(_file ${ARGV})
-            add_custom_command(TARGET clang-format
-                COMMAND
-                    ${KDE_CLANG_FORMAT_EXECUTABLE}
-                    -style=file
-                    -i
-                    ${_file}
-                WORKING_DIRECTORY
-                    ${CMAKE_CURRENT_SOURCE_DIR}
-                COMMENT
-                    "Formatting ${_file}..."
-                )
+            # check if the file is inside the build directory => ignore such files
+            get_filename_component(_full_file_path ${_file} REALPATH)
+            string(FIND ${_full_file_path} ${_binary_dir} _index)
+            if(NOT _index EQUAL 0)
+                add_custom_command(TARGET clang-format
+                    COMMAND
+                        ${KDE_CLANG_FORMAT_EXECUTABLE}
+                        -style=file
+                        -i
+                        ${_full_file_path}
+                    WORKING_DIRECTORY
+                        ${CMAKE_CURRENT_SOURCE_DIR}
+                    COMMENT
+                        "Formatting ${_full_file_path}..."
+                    )
+            endif()
         endforeach()
     else()
         add_custom_command(TARGET clang-format
-- 
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