Add SLINT_TARGET_CARGO_FLAGS cmake variable

* Add SLINT_TARGET_CARGO_FLAGS cmake variable

CHANGELOG.md

@@ -3,6 +3,10 @@ All notable changes to this project are documented in this file.
 
 ## Unreleased
 
+### C++
+
+ - Added `SLINT_TARGET_CARGO_FLAGS` cmake variable
+
 ## [1.1.1] - 2023-07-10
 
 ### General

api/cpp/CMakeLists.txt

@@ -27,6 +27,13 @@ endif()
 corrosion_import_crate(MANIFEST_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../Cargo.toml"
     CRATES slint-cpp ${slint_compiler_crate})
 
+set(SLINT_TARGET_CARGO_FLAGS "" CACHE STRING
+    "Flags to pass to cargo when building the Slint runtime library")
+if(SLINT_TARGET_CARGO_FLAGS)
+    corrosion_set_cargo_flags(slint-cpp ${SLINT_TARGET_CARGO_FLAGS})
+endif()
+
+
 # When doing "make install" package builds, set install_name to rpath, so that the installed
 # binaries don't have a load-command pointing back to their build directory.
 # Don't do this when Slint is used via FetchContent. While we could set CMAKE_BUILD_RPATH to

api/cpp/docs/cmake.md

@@ -100,6 +100,12 @@ to discover and toggle features.
 This works when compiling Slint as a package, using `cmake --build` and
 `cmake --install`, or when including Slint using `FetchContent`.
 
+### Rust Flags
+
+Slint uses [Corrosion](https://github.com/corrosion-rs/corrosion) to build Slint, which is developed in Rust. You can utilize [Corrosion's global CMake variables](https://corrosion-rs.github.io/corrosion/usage.html#global-corrosion-options) to control certain aspects of the Rust build process.
+
+Furthermore, you can set the `SLINT_TARGET_CARGO_FLAGS` cache variable to specify additional flags for the Slint runtime during the build.
+
 ### Back-Ends
 
 Slint needs a back-end that acts as liaison between Slint and the OS. Several