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#
# Setup flex to build lexer
#
# We don't really support any lex(1) other than flex. It's possible some
# minor editing of lex.l could get you through that...
#
# If you DO have flex, we go ahead and use it to build the lexer. If you
# don't, we check to see if there's a prebuilt one in the tree; one will
# be shipped with tarballs for releases etc (but you'll still build your
# own if you have flex). If neither of those hit, not much we can do but
# bomb...
# Override for forcing use of pregen'd source files
if(NOT FORCE_PREGEN_FILES)
find_package(FLEX)
endif()
if(FLEX_FOUND)
FLEX_TARGET(ctwm_lexer lex.l ${CMAKE_CURRENT_BINARY_DIR}/lex.c)
else()
# See if we have a pre-built lex.c
find_file(LEX_C lex.c
PATHS ${GENSRCDIR}
NO_DEFAULT_PATH)
if(LEX_C)
# Make the build process just copy it in
message(STATUS "No flex found, using prebuilt lex.c")
add_custom_command(OUTPUT lex.c
DEPENDS ${LEX_C}
COMMAND cp ${LEX_C} .
COMMENT "Copying in prebuilt lex.c"
)
else()
# No flex, no pre-built lex.c
message(FATAL_ERROR "Can't find flex, and no prebuilt files "
"available.")
endif(LEX_C)
endif(FLEX_FOUND)
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