fix: python environment, working around fastcrc and msgspec on mingw

Author: sylefeb

tools/requirements.txt

@@ -4,4 +4,4 @@ yowasp-yosys
 yowasp-nextpnr-ice40
 yowasp-nextpnr-ecp5
 yowasp-nextpnr-himbaechel-gowin
-yowasp-nextpnr-himbaechel-gatemate
+# yowasp-nextpnr-himbaechel-gatemate # TODO: enable when available

tools/setup-python-env.sh

@@ -9,12 +9,48 @@ set -euo pipefail
 VENV_DIR="$HOME/.local/share/silice/.venv"
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 REQ_FILE="$SCRIPT_DIR/requirements.txt"
-# Create environment director
+
+# Detect MinGW
+IS_MINGW=false
+case "${MSYSTEM:-}" in
+    MINGW32|MINGW64|MSYS|CLANG32|CLANG64|CLANGARM64|UCRT64)
+        IS_MINGW=true
+        ;;
+esac
+if [ "$IS_MINGW" = false ]; then
+    case "$(uname -s 2>/dev/null)" in
+        MINGW*|MSYS*|CYGWIN*)
+            IS_MINGW=true
+            ;;
+    esac
+fi
+
+# Create environment directory
 mkdir -p "$(dirname "$VENV_DIR")"
+
 # Create the python environment
 if [ ! -d "$VENV_DIR" ]; then
-    echo "Creating venv at $VENV_DIR"
+    echo "Creating and setting up venv at $VENV_DIR, this can take a few minutes"
     python3 -m venv "$VENV_DIR"
 fi
-# Install
-"$VENV_DIR/bin/pip" install --quiet -r "$REQ_FILE"
+
+PIP="$VENV_DIR/bin/pip"
+
+if [ "$IS_MINGW" = true ]; then
+    echo "MinGW environment detected — using apycula install workaround to avoid fastcrc and msgspec"
+
+    TMP_REQ="$(mktemp /tmp/silice-req-XXXXXX.txt)"
+    grep -v -iE '^(apycula|yowasp-nextpnr-himbaechel-gowin)' "$REQ_FILE" > "$TMP_REQ" || true
+    "$PIP" install --quiet -r "$TMP_REQ"
+    rm -f "$TMP_REQ"
+
+    # Pure-Python replacements for the C extensions apycula would normally pull
+    "$PIP" install --quiet numpy msgpack cattrs
+    # Install the two packages without dependency resolution so pip never
+    # attempts to build fastcrc or msgspec from source
+    "$PIP" install --quiet --no-deps apycula
+    "$PIP" install --quiet --no-deps yowasp-nextpnr-himbaechel-gowin
+else
+	# Normal install
+    "$PIP" install --quiet -r "$REQ_FILE"
+fi