feat: add self-contained offline development resources

native/planegcs/build.sh

@@ -7,6 +7,9 @@ PLANEGCS_SOURCE_DIR="${FREECAD_SOURCE_DIR}/src/Mod/Sketcher/App/planegcs"
 DIST_DIR="${PLANEGCS_DIST_DIR:-${ROOT_DIR}/native/planegcs/dist}"
 PUBLIC_DIR="${PLANEGCS_PUBLIC_DIR:-${ROOT_DIR}/public/native/planegcs}"
 HOST_HEADERS_DIR="${ROOT_DIR}/.cache/bitbybit/planegcs-host-headers"
+OFFLINE_HEADERS_DIR="${ROOT_DIR}/.cache/offline-sysroot/include"
+BOOST_INCLUDE_DIR="${BOOST_INCLUDE_DIR:-$([[ -d "${OFFLINE_HEADERS_DIR}/boost" ]] && printf '%s' "${OFFLINE_HEADERS_DIR}" || printf '%s' /usr/include)}"
+EIGEN3_INCLUDE_DIR="${EIGEN3_INCLUDE_DIR:-$([[ -d "${OFFLINE_HEADERS_DIR}/eigen3" ]] && printf '%s' "${OFFLINE_HEADERS_DIR}/eigen3" || printf '%s' /usr/include/eigen3)}"
 
 if [[ ! -f "${PLANEGCS_SOURCE_DIR}/GCS.cpp" ]]; then
   echo "Locked FreeCAD planegcs source not found: ${PLANEGCS_SOURCE_DIR}" >&2
@@ -16,14 +19,17 @@ if ! command -v em++ >/dev/null; then
   echo "Emscripten em++ is required." >&2
   exit 1
 fi
-if [[ ! -d /usr/include/eigen3 ]] || [[ ! -d /usr/include/boost ]]; then
+if [[ ! -d "${EIGEN3_INCLUDE_DIR}" ]] || [[ ! -d "${BOOST_INCLUDE_DIR}/boost" ]]; then
   echo "Eigen3 and Boost headers are required." >&2
   exit 1
 fi
 
 mkdir -p "${DIST_DIR}" "${PUBLIC_DIR}" "${HOST_HEADERS_DIR}"
+if [[ -L "${HOST_HEADERS_DIR}/boost" && "$(readlink "${HOST_HEADERS_DIR}/boost")" != "${BOOST_INCLUDE_DIR}/boost" ]]; then
+  rm "${HOST_HEADERS_DIR}/boost"
+fi
 if [[ ! -e "${HOST_HEADERS_DIR}/boost" ]]; then
-  ln -s /usr/include/boost "${HOST_HEADERS_DIR}/boost"
+  ln -s "${BOOST_INCLUDE_DIR}/boost" "${HOST_HEADERS_DIR}/boost"
 fi
 em++ \
   "${PLANEGCS_SOURCE_DIR}/Geo.cpp" \
@@ -36,7 +42,7 @@ em++ \
   -I"${FREECAD_SOURCE_DIR}/src" \
   -I"${PLANEGCS_SOURCE_DIR}" \
   -I"${HOST_HEADERS_DIR}" \
-  -I/usr/include/eigen3 \
+  -I"${EIGEN3_INCLUDE_DIR}" \
   -std=c++20 -O2 -DNDEBUG -DEIGEN_NO_DEBUG -fexceptions -pthread --bind \
   -sMODULARIZE=1 -sEXPORT_ES6=1 -sENVIRONMENT=web,worker,node \
   -sPTHREAD_POOL_SIZE=2 \