Failure to generate c code using "float" type instead of "double"

Hi, I wanna generate C code for my MCU, and use "float" instead of "double". The Matlab command is: 

"m.codegen('Ccode1','FLOAT',true,'LONG',false)"

This command is able to generate c code. However the type of numerical variable is still double. 

1> [CMake] -- Floats are OFF
1> [CMake] -- Long integers (64bit) are ON

what's wrong with it? 