vec-iree: Make the springbok BSP configurable

Change-Id: Ice747f014edcbf7835315a2d5e7a010e05ea64fe

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad2c355..2a3b606 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,7 @@
 set(STACK_SIZE "10K" CACHE STRING "Stack size (default: 10K)")
 add_link_options("LINKER:--defsym=__stack_size__=${STACK_SIZE}")
 set(SPRINGBOK_LINKER_SCRIPT "$ENV{ROOTDIR}/sw/vec/springbok/matcha.ld" CACHE PATH "Springbok linker script path (default: matcha.ld)")
+set(BUILD_WITH_SPRINGBOK ON CACHE BOOL "Build the target with springbok BSP (default: ON)")
 add_subdirectory($ENV{ROOTDIR}/sw/vec/springbok springbok)
 
 #-------------------------------------------------------------------------------
@@ -43,7 +44,13 @@
   add_definitions(-DIREE_USER_CONFIG_H="${SPRINGBOK_CONFIG_HEADER}")
 endif()
 
-include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/riscv_springbok.cmake)
+# Springbok BSPrelated setting
+if(${BUILD_WITH_SPRINGBOK})
+  include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/riscv_springbok.cmake)
+else()
+  # Add the LOG_X header file for build compatibility.
+  include_directories($ENV{ROOTDIR}/sw/vec/springbok/include)
+endif()
 
 # Build IREE runtime libraries.
 add_subdirectory($ENV{ROOTDIR}/toolchain/iree iree)