From 634f9eba688126b949c03e03fecfe8c4cfff0495 Mon Sep 17 00:00:00 2001
From: Tony Butler <spudz76@gmail.com>
Date: Mon, 7 Feb 2022 13:07:10 -0700
Subject: [PATCH] Check for required L3CACHE object type in hwloc

---
 cmake/FindHWLOC.cmake  | 7 +++++++
 cmake/ghostrider.cmake | 1 +
 2 files changed, 8 insertions(+)

diff --git a/cmake/FindHWLOC.cmake b/cmake/FindHWLOC.cmake
index 55309d3e..a3ca9984 100644
--- a/cmake/FindHWLOC.cmake
+++ b/cmake/FindHWLOC.cmake
@@ -23,3 +23,10 @@ set(HWLOC_INCLUDE_DIRS ${HWLOC_INCLUDE_DIR})
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(HWLOC DEFAULT_MSG HWLOC_LIBRARY HWLOC_INCLUDE_DIR)
+
+include(CheckCSourceCompiles)
+check_c_source_compiles( "#include <hwloc.h>\nint main(void) {hwloc_obj_t o; o->type = HWLOC_OBJ_L3CACHE; return 0;}" HAVE_HWLOC_OBJ_L3CACHE)
+if (NOT HAVE_HWLOC_OBJ_L3CACHE)
+    message(STATUS "HWLOC is too old (v2 minimum), some algorithms will not be built, may cause other problems")
+    set(WITH_GHOSTRIDER OFF CACHE BOOL "Enable GhostRider algorithm" FORCE)
+endif()
diff --git a/cmake/ghostrider.cmake b/cmake/ghostrider.cmake
index 3bc935b1..9a5b1745 100644
--- a/cmake/ghostrider.cmake
+++ b/cmake/ghostrider.cmake
@@ -3,6 +3,7 @@ if (WITH_GHOSTRIDER)
     add_subdirectory(src/crypto/ghostrider)
     set(GHOSTRIDER_LIBRARY ghostrider)
 else()
+    message(STATUS "WITH_GHOSTRIDER=OFF ... GhostRider algorithm disabled")
     remove_definitions(/DXMRIG_ALGO_GHOSTRIDER)
     set(GHOSTRIDER_LIBRARY "")
 endif()