ci: test that BUILD_RUST=ON builds (#1459)

.github/ci/build_rust.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+function get_dependencies {
+    :
+}
+
+function build_nextpnr {
+    mkdir build
+    pushd build
+    cmake .. -DARCH=generic -DWERROR=on -DBUILD_RUST=on
+    make nextpnr-generic -j`nproc`
+    popd
+}
+
+function run_tests {
+    export PATH=${GITHUB_WORKSPACE}/.yosys/bin:$PATH
+    ( export NPNR=$(pwd)/build/nextpnr-generic && cd tests/generic/flow && ./run.sh )
+}
+
+function run_archcheck {
+    pushd build
+    # This isn't strictly necessary, since it's tested by build_generic.sh
+    # but it can't hurt to run it anyway.
+    ./nextpnr-generic --uarch example --test
+    popd
+}

.github/workflows/arch_ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [mistral, ice40, ecp5, generic, nexus, machxo2, himbaechel]
+        arch: [mistral, ice40, ecp5, generic, nexus, machxo2, himbaechel, rust]
     runs-on: ubuntu-latest
     env:
       DEPS_PATH: ${{ github.workspace }}/deps
@@ -30,7 +30,7 @@ jobs:
     - name: Install
       run: |
         sudo apt-get update
-        sudo apt-get install git make cmake libboost-all-dev python3-dev pypy3 libeigen3-dev tcl-dev lzma-dev libftdi-dev clang bison flex swig qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools iverilog libreadline-dev liblzma-dev
+        sudo apt-get install git make cmake libboost-all-dev python3-dev pypy3 libeigen3-dev tcl-dev lzma-dev libftdi-dev clang bison flex swig qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools iverilog libreadline-dev liblzma-dev cargo rustc
 
     - name: Cache yosys installation
       uses: actions/cache@v4