Plugins (Build): Build G-Force plugin only if floats are 32-bit.

Author: kaixiong

libvisual-plugins/CMakeLists.txt

@@ -76,6 +76,8 @@ CHECK_FUNCTION_EXISTS(mmap HAVE_MMAP)
 CHECK_FUNCTION_EXISTS(mremap HAVE_MREMAP)
 #AC_FUNC_MMAP
 
+INCLUDE(CheckTypeSize)
+
 # Assembly
 #AM_PROG_AS
 
@@ -215,6 +217,14 @@ IF(ENABLE_GOOM2K4)
   ENDIF()
 ENDIF()
 
+IF(ENABLE_GFORCE)
+  CHECK_TYPE_SIZE(float CXX_FLOAT_SIZE LANGUAGE CXX)
+  IF(NOT CXX_FLOAT_SIZE EQUAL 4)
+    MESSAGE(WARNING "G-Force requires 32-bit floats.")
+    SET(ENABLE_GFORCE no)
+  ENDIF()
+ENDIF()
+
 IF(ENABLE_GSTREAMER)
   PKG_CHECK_MODULES(GSTREAMER gstreamer-1.0>=${GST_REQUIRED_VERSION} IMPORTED_TARGET)
   IF(NOT GSTREAMER_FOUND)