Bump Rust to 1.38.0

Due to rust-lang/rust#62558, the tools: rls,
clippy, and rustfmt cannot be built.

We also remove src which cuts the resulting size of the dep from about
330MB to 180MB.

The build is further broken into two steps:
1. `x.py dist`
2. `x.py install`

This change is because `x.py install` now fails due to an issue where
bootstrap tries to install  rustc-aarch64-linux-android before the
installation script is generated.

packages/rust/build.sh

@@ -2,9 +2,9 @@ TERMUX_PKG_HOMEPAGE=https://www.rust-lang.org/
 TERMUX_PKG_DESCRIPTION="Systems programming language focused on safety, speed and concurrency"
 TERMUX_PKG_LICENSE="MIT"
 TERMUX_PKG_MAINTAINER="Kevin Cotugno @kcotugno"
-TERMUX_PKG_VERSION=1.36.0
+TERMUX_PKG_VERSION=1.38.0
 TERMUX_PKG_SRCURL=https://static.rust-lang.org/dist/rustc-$TERMUX_PKG_VERSION-src.tar.xz
-TERMUX_PKG_SHA256=f51645b9f787af4a5d94db17f6af39db0c55980ed24fe366cad55b57900f8f2d
+TERMUX_PKG_SHA256=3a7991aa4cb44ef941d71636e45a95468b520dc6fc7cf725364925bd3e3d3a34
 TERMUX_PKG_DEPENDS="libc++, clang, openssl, lld, zlib"
 
 termux_step_configure() {
@@ -18,8 +18,8 @@ termux_step_configure() {
 	# like 30 to 40 + minutes ... so lets get it right
 
 	# 1.36 needs 1.35 to build revert to using $TERMUX_PKG_VERSION next time..
-	rustup install 1.35.0
-	export PATH=$HOME/.rustup/toolchains/1.35.0-x86_64-unknown-linux-gnu/bin:$PATH
+	rustup install 1.37.0
+	export PATH=$HOME/.rustup/toolchains/1.37.0-x86_64-unknown-linux-gnu/bin:$PATH
 	local RUSTC=$(which rustc)
 	local CARGO=$(which cargo)
 
@@ -44,16 +44,21 @@ termux_step_configure() {
 }
 
 termux_step_make() {
-return 0;
+	$TERMUX_PKG_SRCDIR/x.py dist
 }
 
 termux_step_make_install() {
-	$TERMUX_PKG_SRCDIR/x.py install  \
-		--host $CARGO_TARGET_NAME \
-		--target $CARGO_TARGET_NAME \
-		--target wasm32-unknown-unknown
+	$TERMUX_PKG_SRCDIR/x.py install
 
 	cd "$TERMUX_PREFIX/lib"
 	ln -sf rustlib/$CARGO_TARGET_NAME/lib/*.so .
 	ln -sf $TERMUX_PREFIX/bin/lld $TERMUX_PREFIX/bin/rust-lld
+
+	cd "$TERMUX_PREFIX/lib/rustlib"
+	rm -rf components \
+		install.log \
+		uninstall.sh \
+		rust-installer-version \
+		manifest-* \
+		x86_64-unknown-linux-gnu
 }

packages/rust/config.toml

@@ -6,37 +6,35 @@ link-shared = true
 
 [build]
 host = ["@triple@"]
-target = ["@triple@"]
+target = ["@triple@", "wasm32-unknown-unknown"]
 rustc = "@RUSTC@"
-cargo = "@CARGO@" 
+cargo = "@CARGO@"
 
 python = "python2.7"
 extended = true
 sanitizers = false
 
+tools = ["cargo", "analysis"]
+
 [install]
 prefix = "@TERMUX_PREFIX@"
 sysconfdir = "etc"
 
 [rust]
-codegen-units = 1
-
+optimize = true
+debug = false
+codegen-units = 0
 jemalloc = false
-
-debuginfo = true
-debuginfo-lines = true
-
 channel = "stable"
-
 rpath = false
 
 [target.x86_64-unknown-linux-gnu]
 llvm-config = "/usr/bin/llvm-config-8"
 
-
 [target.@triple@]
 android-ndk = "@TERMUX_STANDALONE_TOOLCHAIN@"
 llvm-config = "@TERMUX_PREFIX@/bin/llvm-config"
 
 [dist]
 src-tarball = false
+missing-tools = true