Tweak R-package

R-package/cleanup.win

@@ -0,0 +1 @@
+rm -f src/Makevars.win

R-package/configure

@@ -1,8 +1,3 @@
-# Note: this script is not executed on Windows. Please add `configure.win` if
-#       you want to check the Rust installation also on Windows. In addition,
-#       don't forget `cleanup.win` if you decide to generate `src/Makevars.win`
-#       in the script.
-
 # Even when `cargo` is on `PATH`, `rustc` might not in some cases. This adds
 # ~/.cargo/bin to PATH to address such cases. Note that is not always available
 # (e.g. or on Ubuntu with Rust installed via APT).

R-package/configure.win

@@ -0,0 +1,24 @@
+CARGO_VERSION="$(cargo --version)"
+
+if [ $ret -ne 0 ]; then
+  echo "-------------- ERROR: CONFIGURATION FAILED --------------------"
+  echo ""
+  echo "The cargo command is not available. To install Rust, please refer"
+  echo "to the official instruction:"
+  echo ""
+  echo "https://www.rust-lang.org/tools/install"
+  echo ""
+  echo "---------------------------------------------------------------"
+
+  exit $ret
+fi
+
+# There's a little chance that rustc is not available on PATH while cargo is.
+# So, just ignore the error case.
+RUSTC_VERSION="$(rustc --version || true)"
+
+# Report the version of Rustc to comply with the CRAN policy
+echo "using Rust package manager: '${CARGO_VERSION}'"
+echo "using Rust compiler: '${RUSTC_VERSION}'"
+
+sed -e "s/@TARGET@/x86_64-pc-windows-gnu/" src/Makevars.win.in > src/Makevars.win

R-package/src/Makevars.win → R-package/src/Makevars.win.in

@@ -1,4 +1,4 @@
-TARGET = x86_64-pc-windows-gnu
+TARGET = @TARGET@
 
 # catch DEBUG envvar, which is passed from pkgbuild::compile_dll()
 PROFILE = $(subst x,release,$(subst truex,dev,$(DEBUG)x))