From e389ab727d6eb1024567c2629150a72fc26fb7ef Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@rambler-co.ru>
Date: Tue, 27 Mar 2012 18:58:04 +0400
Subject: [PATCH] Detect amd64.

---
 CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80045a4bb..565cabe04 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,6 +97,19 @@ IF(CMAKE_INSTALL_PREFIX)
     SET(PREFIX ${CMAKE_INSTALL_PREFIX})
 ENDIF(CMAKE_INSTALL_PREFIX)
 
+# Try to detect platform for further configuration
+CHECK_C_SOURCE_COMPILES ("#if !defined(__x86_64) && !defined(__amd64) && !defined(_M_X64)
+					#error assume 32 bit arch
+					#endif
+					int main() { return 0;}" AMD_64)
+IF(NOT BUILD_CPU_MODE)
+	IF(AMD_64)
+		SET (BUILD_CPU_MODE "64")
+	ELSE(AMD_64)
+		SET (BUILD_CPU_MODE "32")
+	ENDIF(AMD_64)
+ENDIF(NOT BUILD_CPU_MODE)
+
 # Platform specific configuration
 IF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
 	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_BSD_SOURCE -DFREEBSD")
-- 
2.39.5