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# Create macros for using the lemon parser generator.
# If we're cross-compiling and /usr/share/lemon/lempar.c exists, try to
# find the system lemon and use it. We need to build our own lemon
# otherwise.
if (CMAKE_CROSSCOMPILING AND EXISTS /usr/share/lemon/lempar.c)
find_program(LEMON_EXECUTABLE lemon)
endif()
if(LEMON_EXECUTABLE)
# Use system lemon
macro(generate_lemon_file _out _in)
add_custom_command(
OUTPUT
${_out}.c
# These files are generated as side-effect
${_out}.h
${_out}.out
COMMAND ${LEMON_EXECUTABLE}
-T/usr/share/lemon/lempar.c
-d.
${_in}
DEPENDS
${_in}
)
endmacro()
add_custom_target(lemon)
else()
# Compile bundled lemon with support for -- to end options
macro(generate_lemon_file _out _in)
add_custom_command(
OUTPUT
${_out}.c
# These files are generated as side-effect
${_out}.h
${_out}.out
COMMAND $<TARGET_FILE:lemon>
-T${CMAKE_SOURCE_DIR}/tools/lemon/lempar.c
-d.
--
${_in}
DEPENDS
${_in}
lemon
${CMAKE_SOURCE_DIR}/tools/lemon/lempar.c
)
endmacro()
endif()
macro(ADD_LEMON_FILES _source _generated)
foreach (_current_FILE ${ARGN})
get_filename_component(_in ${_current_FILE} ABSOLUTE)
get_filename_component(_basename ${_current_FILE} NAME_WE)
set(_out ${CMAKE_CURRENT_BINARY_DIR}/${_basename})
generate_lemon_file(${_out} ${_in})
list(APPEND ${_source} ${_in})
list(APPEND ${_generated} ${_out}.c)
endforeach(_current_FILE)
endmacro(ADD_LEMON_FILES)
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