From 0318d0385acc2dc790087a81421982fc2de21357 Mon Sep 17 00:00:00 2001
From: Rasmus Thomsen <rasmus.thomsen@protonmail.com>
Date: Sun, 16 Sep 2018 21:39:23 +0200
Subject: [PATCH] build-style/cargo.sh: add

---
 Manual.md                               |  4 +++
 common/build-style/cargo.sh             | 35 +++++++++++++++++++++++++
 common/environment/build-style/cargo.sh | 10 +++++++
 3 files changed, 49 insertions(+)
 create mode 100644 common/build-style/cargo.sh
 create mode 100644 common/environment/build-style/cargo.sh

diff --git a/Manual.md b/Manual.md
index 42e1c0ddbe2..0f0f0503288 100644
--- a/Manual.md
+++ b/Manual.md
@@ -734,6 +734,10 @@ The current list of available `build_style` scripts is the following:
 `do_configure()`, `do_build()`, etc., and may overwrite default `do_fetch()` and
 `do_extract()` that fetch and extract files defined in `distfiles` variable.
 
+- `cargo` For packages written in rust that use Cargo for building.
+Configuration arguments (such as `--features`) can be defined in the variable
+`configure_args` and are passed to cargo during `do_build`.
+
 - `cmake` For packages that use the CMake build system, configuration arguments
 can be passed in via `configure_args`. The `cmake_builddir` variable may be
 defined to specify the directory for building under `build_wrksrc` instead of
diff --git a/common/build-style/cargo.sh b/common/build-style/cargo.sh
new file mode 100644
index 00000000000..4f4809be8ba
--- /dev/null
+++ b/common/build-style/cargo.sh
@@ -0,0 +1,35 @@
+#
+# This helper is for building rust projects which use cargo for building
+#
+
+do_configure() {
+	mkdir -p .cargo
+	# respect makejobs, do cross stuff
+	cat > .cargo/config <<EOF
+[build]
+jobs = ${makejobs#*j}
+target = "${RUST_TARGET}"
+
+[target.${RUST_TARGET}]
+linker = "${CC}"
+EOF
+}
+
+do_build() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} build --release ${configure_args}
+}
+
+do_check() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} test --release ${make_check_args}
+}
+
+do_install() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} install --root="${DESTDIR}/usr" ${make_install_args}
+	rm "${DESTDIR}"/usr/.crates.toml
+}
diff --git a/common/environment/build-style/cargo.sh b/common/environment/build-style/cargo.sh
new file mode 100644
index 00000000000..be9aa1b4ecd
--- /dev/null
+++ b/common/environment/build-style/cargo.sh
@@ -0,0 +1,10 @@
+hostmakedepends+=" cargo"
+
+if [ "$CROSS_BUILD" ]; then
+	makedepends+=" rust"
+fi
+
+# Use the config we set in do_configure
+export CARGO_HOME="$wrksrc/.cargo"
+
+export PKG_CONFIG_ALLOW_CROSS=1