From 9f9989ea72f93f9ffb6792d7297f981d86c72b20 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Thu, 2 Feb 2023 18:04:40 +0100
Subject: [PATCH] Properly detect changes in Rust code and recompile Rust
 libraries

Due to we need to substitude config for Rust builds (see #44762 for
details), the source dir is copied to the binary dir, but this is done
only once, so to detect changes in sources you need to run cmake,
without this patch.

Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
---
 rust/CMakeLists.txt     | 14 +++++++++++++-
 rust/copy_exclude.cmake |  2 ++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 rust/copy_exclude.cmake

diff --git a/rust/CMakeLists.txt b/rust/CMakeLists.txt
index 1f11423a557..ec2377fce71 100644
--- a/rust/CMakeLists.txt
+++ b/rust/CMakeLists.txt
@@ -51,8 +51,20 @@ file(COPY ".cargo" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
 function(add_rust_subdirectory src)
     set(dst "${CMAKE_CURRENT_BINARY_DIR}/${src}")
     message(STATUS "Copy ${src} to ${dst}")
-    file(COPY "${src}" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
+    file(COPY "${src}" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}"
+        PATTERN target EXCLUDE)
     add_subdirectory("${dst}" "${dst}")
+
+    # cmake -E copy* do now know how to exclude files
+    # but we need to exclude "target" folder from copying, if someone or semantic
+    # completion created it.
+    add_custom_target(${src}-update ALL
+        COMMAND ${CMAKE_COMMAND}
+            -DFROM=${src}
+            -DTO=${CMAKE_CURRENT_BINARY_DIR}
+            -P "${CMAKE_CURRENT_SOURCE_DIR}/copy_exclude.cmake"
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        VERBATIM)
 endfunction()
 
 add_rust_subdirectory (BLAKE3)
diff --git a/rust/copy_exclude.cmake b/rust/copy_exclude.cmake
new file mode 100644
index 00000000000..c6a6ff56b6e
--- /dev/null
+++ b/rust/copy_exclude.cmake
@@ -0,0 +1,2 @@
+file(COPY "${FROM}" DESTINATION "${TO}"
+    PATTERN target EXCLUDE)