Support building without TR1.
Change-Id: Ib59e201198e1ff2621626ab80e6b6f2156f0d1d1
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 628cab7..f8af88c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -413,17 +413,27 @@
ADD_DEFINITIONS(-DCERES_NO_THREADS)
ENDIF (${BUILD_ANDROID})
-# Use the std namespace for the hash<> and related templates. This may vary by
-# system.
-IF (MSVC)
- # This is known to work with Visual Studio 2010 Express.
- ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_START=namespace std {\"")
- ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_END=}\"")
-ELSE (MSVC)
- # This is known to work with recent versions of Linux and Mac OS X.
- ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_START=namespace std { namespace tr1 {\"")
- ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_END=}}\"")
-ENDIF (MSVC)
+OPTION(DISABLE_TR1
+ "Don't use TR1. This replaces some hash tables with sets. Slower."
+ OFF)
+
+IF (${DISABLE_TR1})
+ MESSAGE("-- Replacing unordered_map/set with map/set (warning: slower!)")
+ ADD_DEFINITIONS(-DCERES_NO_TR1)
+ELSE (${DISABLE_TR1})
+ MESSAGE("-- Using normal TR1 unordered_map/set")
+ # Use the std namespace for the hash<> and related templates. This may vary by
+ # system.
+ IF (MSVC)
+ # This is known to work with Visual Studio 2010 Express.
+ ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_START=namespace std {\"")
+ ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_END=}\"")
+ ELSE (MSVC)
+ # This is known to work with recent versions of Linux and Mac OS X.
+ ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_START=namespace std { namespace tr1 {\"")
+ ADD_DEFINITIONS("\"-DCERES_HASH_NAMESPACE_END=}}\"")
+ ENDIF (MSVC)
+ENDIF (${DISABLE_TR1})
INCLUDE_DIRECTORIES(
include
