fix "INFO-march=i686 flag not accepted"

Author: jK

CMakeLists.txt

@@ -195,7 +195,7 @@ if    (CMAKE_SIZEOF_VOID_P EQUAL 8)
 	set (MARCH_FLAG CACHE STRING "CPU optimization (use i686 for generic optimization)")
 else  (CMAKE_SIZEOF_VOID_P EQUAL 8)
 	message (STATUS "Building Spring for 32bit environment")
-	set (MARCH_FLAG ${I686_FLAG} CACHE STRING "CPU optimization (use i686 for generic optimization)")
+	set (MARCH_FLAG ${MARCH} CACHE STRING "CPU optimization (use i686 for generic optimization)")
 endif (CMAKE_SIZEOF_VOID_P EQUAL 8)
 
 if    ($ENV{CXX} MATCHES "icpc")

rts/build/cmake/TestCXXFlags.cmake

@@ -26,7 +26,7 @@ If    (NOT DEFINED VISIBILITY_HIDDEN)
 		EndIf (HAS_VISIBILITY_HIDDEN)
 	EndIf (NOT MINGW AND NOT APPLE)
 EndIf (NOT DEFINED VISIBILITY_HIDDEN)
-	
+
 
 If    (NOT DEFINED VISIBILITY_INLINES_HIDDEN)
 	Set(VISIBILITY_INLINES_HIDDEN "")
@@ -87,13 +87,13 @@ If    (NOT DEFINED LTO_FLAGS)
 	EndIf (LTO AND LTO_WHOPR)
 EndIf (NOT DEFINED LTO_FLAGS)
 
-IF    (NOT DEFINED I686_FLAG)
-	CHECK_CXX_ACCEPTS_FLAG("-march i686" HAS_I686_FLAG)
-	IF    (HAS_I686_FLAG)
-		Set(HAS_I686_FLAG "-march i686")
-	Else  (HAS_I686_FLAG)
-		Message(INFO "-march i686 flag not accepted")
-		Set(I686_FLAG "")
-	EndIf (HAS_I686_FLAG)
-EndIf (NOT DEFINED I686_FLAG)
 
+IF    (NOT DEFINED MARCH)
+	CHECK_CXX_ACCEPTS_FLAG("-march=i686" HAS_I686_FLAG_)
+	IF    (HAS_I686_FLAG_)
+		Set(MARCH "i686")
+	Else  (HAS_I686_FLAG_)
+		Message(INFO "-march=i686 flag not accepted")
+		Set(MARCH "")
+	EndIf (HAS_I686_FLAG_)
+EndIf (NOT DEFINED MARCH)