Allow Specifying Custom Sysroot

dependencies/armhf-sysroot/CMakeLists.txt

@@ -1,9 +1,15 @@
 project(armhf-sysroot)
 
-# Packages
+# Allow Custom Sysroot
+set(MCPI_CUSTOM_BUNDLED_ARMHF_SYSROOT "" CACHE PATH "Custom Bundled ARMHF Sysroot")
+if(MCPI_CUSTOM_BUNDLED_ARMHF_SYSROOT)
+    # Custom Sysroot
+    set(SYSROOT_DIR "${MCPI_CUSTOM_BUNDLED_ARMHF_SYSROOT}")
+else()
+    # Download From APT
     set(APT_PACKAGES "libc6" "libstdc++6")
 
-# Trigger Reconfigure On APT Change
+    # Reconfigure CMake If APT Data Is Changed
     file(GLOB_RECURSE APT_FILES "apt/*")
     foreach(APT_FILE IN LISTS APT_FILES)
         set_property(
@@ -51,7 +57,7 @@ file(WRITE "${APT_DIR}/apt.conf" "${APT_CONFIG}")
     set(APT_ENV
         "${CMAKE_COMMAND}"
         -E env
-    DEBIAN_FRONTEND=noninteractive
+        "DEBIAN_FRONTEND=noninteractive"
         "APT_CONFIG=${APT_DIR}/apt.conf"
     )
 
@@ -64,24 +70,25 @@ file(MAKE_DIRECTORY "${SYSROOT_DIR}")
     add_custom_command(
         OUTPUT "${APT_DIR}/.update-stamp"
         COMMAND ${APT_ENV} apt-get update
-    COMMAND touch ARGS "${APT_DIR}/.update-stamp"
+        COMMAND "${CMAKE_COMMAND}" -E touch "${APT_DIR}/.update-stamp"
         VERBATIM
     )
     add_custom_command(
         OUTPUT "${APT_DIR}/.download-stamp"
         DEPENDS "${APT_DIR}/.update-stamp"
         COMMAND ${APT_ENV} apt-get install -y --no-install-recommends --download-only ${APT_PACKAGES}
-    COMMAND touch ARGS "${APT_DIR}/.download-stamp"
+        COMMAND "${CMAKE_COMMAND}" -E touch "${APT_DIR}/.download-stamp"
         VERBATIM
     )
     add_custom_command(
         OUTPUT "${APT_DIR}/.extract-stamp"
         DEPENDS "${APT_DIR}/.download-stamp"
         COMMAND ${APT_ENV} find "${APT_DIR}/archives" -maxdepth 1 -type f -name "*.deb" -exec dpkg -x {} "${SYSROOT_DIR}" ";"
-    COMMAND touch ARGS "${APT_DIR}/.extract-stamp"
+        COMMAND "${CMAKE_COMMAND}" -E touch "${APT_DIR}/.extract-stamp"
         VERBATIM
     )
     add_custom_target(armhf-sysroot ALL DEPENDS "${APT_DIR}/.extract-stamp")
+endif()
 
 # Install
 install(