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# Stamp_Check(VARNAME PATH CONTENT)
# Stamp_Check sets VARNAME as TRUE if a file exists at "PATH", and its content is same as "CONTENT"
# Stamp_Check sets VARNAME as FALSE otherwise
function(Stamp_Check VARNAME PATH EXPECTED_CONTENT)
if(NOT EXISTS "${PATH}")
set(${VARNAME} FALSE PARENT_SCOPE)
return()
endif(NOT EXISTS "${PATH}")
file(READ ${PATH} OBTAINED_CONTENT)
if(NOT EXPECTED_CONTENT STREQUAL OBTAINED_CONTENT)
set(${VARNAME} FALSE PARENT_SCOPE)
return()
endif(NOT EXPECTED_CONTENT STREQUAL OBTAINED_CONTENT)
set(${VARNAME} TRUE PARENT_SCOPE)
endfunction(Stamp_Check)
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