classes-recipe: add cargo_c.bbclass

This class can be used inside rust recipe to generate
a rust library that can be called by C/C++ code.

The rust recipe which uses this class has to only replace
"inherit cargo" by "inherit cargo_c".

(From OE-Core rev: 1e4862db1d6293872b76b62acee1e4a5e2597367)

Signed-off-by: Frederic Martinsons <frederic.martinsons@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/cargo_c.bbclass

@@ -0,0 +1,41 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+##
+## Purpose:
+## This class is used by any recipes that want to compile a C ABI compatible
+## library with header and pkg config file
+
+inherit cargo pkgconfig
+
+# the binaries we will use
+CARGO_C_BUILD = "cargo-cbuild"
+CARGO_C_INSTALL = "cargo-cinstall"
+
+# We need cargo-c to compile for the target
+BASEDEPENDS:append = " cargo-c-native"
+
+do_compile[progress] = "outof:\s+(\d+)/(\d+)"
+cargo_c_do_compile() {
+    oe_cargo_fix_env
+    export RUSTFLAGS="${RUSTFLAGS}"
+    bbnote "Using rust targets from ${RUST_TARGET_PATH}"
+    bbnote "cargo-cbuild = $(which ${CARGO_C_BUILD})"
+    bbnote "${CARGO_C_BUILD} cbuild ${CARGO_BUILD_FLAGS}"
+    "${CARGO_C_BUILD}" cbuild ${CARGO_BUILD_FLAGS}
+}
+
+cargo_c_do_install() {
+    oe_cargo_fix_env
+    export RUSTFLAGS="${RUSTFLAGS}"
+    bbnote "cargo-cinstall = $(which ${CARGO_C_INSTALL})"
+    "${CARGO_C_INSTALL}" cinstall ${CARGO_BUILD_FLAGS} \
+        --destdir ${D} \
+        --prefix ${prefix} \
+        --library-type cdylib
+}
+
+EXPORT_FUNCTIONS do_compile do_install