Hello,

I run into a problem when use FindBISON module in CMakeLists.txt. The 
BISON_TARGET will run bison command in CMAKE_CURRENT_SOURCE_DIR. The GNU Bison 
has problem for ‘—defines=‘ option because it will always generate the header 
file in the working directory. So, 

BISON_TARGET(Parser ${CMAKE_CURRENT_SOURCE_DIR}/Parser.y
${CMAKE_CURRENT_BINARY_DIR}/Parser.bison
DEFINES_FILE ${CMAKE_CURRENT_BINARY_DIR}/Parser.h)

will not work, because ‘Parser.h’ will be generated under 
CMAKE_CURRENT_SOURCE_DIR.

So I just wonder whither it is better for  BISON_TARGET to use 
CMAKE_CURRENT_BINARY_DIR as WORKING_DIRECTORY.

Thanks
Mingjie
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