1 files changed, 48 insertions, 0 deletions
diff --git a/content/2022-05-30-cmake-cargo-example/libcalc/CMakeLists.txt b/content/2022-05-30-cmake-cargo-example/libcalc/CMakeLists.txt
new file mode 100644
index 0000000..2abab17
--- /dev/null
+++ b/content/2022-05-30-cmake-cargo-example/libcalc/CMakeLists.txt
@@ -0,0 +1,48 @@
+cmake_minimum_required(VERSION 3.14)
+
+set(BDIR ${CMAKE_BINARY_DIR}/libcalc)
+
+# Define external project to build rust lib with cargo.
+include(ExternalProject)
+ExternalProject_Add(
+    ext_libcalc
+    # Always trigger build, let cargo decide if we want to rebuild.
+    BUILD_ALWAYS         ON
+    CONFIGURE_COMMAND    ""
+    # Can not pass arguments to build.rs and was not able to set env variables
+    # for the external build command, therefore use 'env' to setup env var.
+    BUILD_COMMAND        env LIBCALC_BUILD_DIR=${BDIR}
+                         cargo build --target-dir ${BDIR} "$<IF:$<CONFIG:Release>,--release,>"
+    BUILD_BYPRODUCTS     ${BDIR}/$<IF:$<CONFIG:Release>,release,debug>/libcalc.a
+                         ${BDIR}/libcalc.h
+    INSTALL_COMMAND      ""
+    # Location of sources (since we don't download).
+    SOURCE_DIR           "${CMAKE_CURRENT_SOURCE_DIR}"
+    # Build dir location used as CWD for build commands.
+    BINARY_DIR           "${CMAKE_CURRENT_SOURCE_DIR}"
+    # Root directory for external project in cmake build dir.
+    PREFIX               "libcalc"
+    # Log directory (relative to PREFIX).
+    LOG_DIR              "log"
+    # Log build step.
+    LOG_BUILD             ON
+    # In case of error output log on terminal.
+    LOG_OUTPUT_ON_FAILURE ON
+)
+
+# Define pseudo target (import lib) for usage in cmake and let it depend on
+# the cargo build.
+add_library(libcalc STATIC IMPORTED GLOBAL)
+add_dependencies(libcalc ext_libcalc)
+
+# Configure the import locations (libs) for the import lib.
+
+set_target_properties(libcalc PROPERTIES
+    IMPORTED_CONFIGURATIONS "Debug;Release"
+    IMPORTED_LOCATION       "${BDIR}/release/libcalc.a"
+    IMPORTED_LOCATION_DEBUG "${BDIR}/debug/libcalc.a"
+)
+
+# Configure the additional interface for they pseudo target.
+
+target_include_directories(libcalc INTERFACE "${BDIR}")