From d79b2b59b2fab9a4337f544a3895e119f05b1b77 Mon Sep 17 00:00:00 2001
From: Geoff Martin <geoff.martin@zettascale.tech>
Date: Thu, 22 Aug 2024 15:58:47 +0100
Subject: [PATCH] Ensure build directory contains a copy of
 rust-toolchain.toml.

When building using cargo's --manifest-path option the toolchain configuration file within the manifest directory is ignored. Ensuring a copy of the rust-toolchain.toml file is in the build directory ensures the toolchain settings are pciked up when building via cmake.
---
 CMakeLists.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0e13dbed..9a5885c77 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,6 +149,16 @@ else()
 	configure_cargo_toml(${cargo_toml_dir_release} ${project_version} ${cargo_lib_name_release})
 endif()
 
+#
+# Copy toolchain configuration to build directory to ensure it is used when cargo is invoked from a directory other
+# than the directory containing the manifest file
+#
+if(NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}/rust-toolchain.toml")
+	file(COPY
+		${CMAKE_CURRENT_SOURCE_DIR}/rust-toolchain.toml
+		DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+endif()
+
 #
 # Configure result library names
 #