From d4dbc18404de3c30e78560f27c92984d8c1d9725 Mon Sep 17 00:00:00 2001
From: Soonho Kong <soonhok@cs.cmu.edu>
Date: Fri, 8 Nov 2013 18:04:55 -0500
Subject: [PATCH] chore(cmake/Modules/FindLua): disable TRY_RUN in
 cross-compilation.

---
 src/cmake/Modules/FindLua.cmake | 49 +++++++++++++++++----------------
 1 file changed, 26 insertions(+), 23 deletions(-)

diff --git a/src/cmake/Modules/FindLua.cmake b/src/cmake/Modules/FindLua.cmake
index 681f9fb72..93f4a1af0 100644
--- a/src/cmake/Modules/FindLua.cmake
+++ b/src/cmake/Modules/FindLua.cmake
@@ -118,30 +118,33 @@ MARK_AS_ADVANCED(LUA_INCLUDE_DIR LUA_LIBRARIES LUA_LIBRARY LUA_MATH_LIBRARY LUA_
 
 # Print out version number
 if (LUA_FOUND)
-  try_run(LUA_CHECK LUA_CHECK_BUILD
-    ${LEAN_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
-    ${LEAN_SOURCE_DIR}/cmake/Modules/CheckLuaNewstate.cc
-    CMAKE_FLAGS -DINCLUDE_DIRECTORIES=${LUA_INCLUDE_DIR}
-    -DLINK_LIBRARIES=${LUA_LIBRARIES}
-    RUN_OUTPUT_VARIABLE LUA_TRY_OUT)
-  if ("${LUA_CHECK}" MATCHES "0" AND "${LUA_CHECK_BUILD}$" MATCHES "TRUE")
-    message(STATUS "lua_newstate works")
-    set(HAS_LUA_NEWSTATE TRUE)
+  if (CMAKE_CROSSCOMPILING)
+    message(STATUS "Cross-compiling: can't find whether lua_objlen or lua_newstate is available.")
   else()
-    message(STATUS "lua_newstate is not supported by your Lua engine, Lean will not be able to track memory consumed by the Lua engine")
-  endif()
+    try_run(LUA_CHECK LUA_CHECK_BUILD
+      ${LEAN_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
+      ${LEAN_SOURCE_DIR}/cmake/Modules/CheckLuaNewstate.cc
+      CMAKE_FLAGS -DINCLUDE_DIRECTORIES=${LUA_INCLUDE_DIR}
+      -DLINK_LIBRARIES=${LUA_LIBRARIES}
+      RUN_OUTPUT_VARIABLE LUA_TRY_OUT)
+    if ("${LUA_CHECK}" MATCHES "0" AND "${LUA_CHECK_BUILD}$" MATCHES "TRUE")
+      message(STATUS "lua_newstate works")
+      set(HAS_LUA_NEWSTATE TRUE)
+    else()
+      message(STATUS "lua_newstate is not supported by your Lua engine, Lean will not be able to track memory consumed by the Lua engine")
+    endif()
 
-  try_run(LUA_CHECK2 LUA_CHECK_BUILD2
-    ${LEAN_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
-    ${LEAN_SOURCE_DIR}/cmake/Modules/CheckLuaObjlen.cc
-    CMAKE_FLAGS -DINCLUDE_DIRECTORIES=${LUA_INCLUDE_DIR}
-    -DLINK_LIBRARIES=${LUA_LIBRARIES}
-    RUN_OUTPUT_VARIABLE LUA_TRY_OUT)
-  if ("${LUA_CHECK2}" MATCHES "0" AND "${LUA_CHECK_BUILD2}$" MATCHES "TRUE")
-    message(STATUS "lua_objlen found")
-    set(HAS_LUA_OBJLEN TRUE)
-  else()
-    message(STATUS "lua_objlen is not available, using lua_rawlen instead")
+    try_run(LUA_CHECK2 LUA_CHECK_BUILD2
+      ${LEAN_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp
+      ${LEAN_SOURCE_DIR}/cmake/Modules/CheckLuaObjlen.cc
+      CMAKE_FLAGS -DINCLUDE_DIRECTORIES=${LUA_INCLUDE_DIR}
+      -DLINK_LIBRARIES=${LUA_LIBRARIES}
+      RUN_OUTPUT_VARIABLE LUA_TRY_OUT)
+    if ("${LUA_CHECK2}" MATCHES "0" AND "${LUA_CHECK_BUILD2}$" MATCHES "TRUE")
+      message(STATUS "lua_objlen found")
+      set(HAS_LUA_OBJLEN TRUE)
+    else()
+      message(STATUS "lua_objlen is not available, using lua_rawlen instead")
+    endif()
   endif()
-
 endif ()