qt5base-lts/mkspecs/features/lex.prf

#
# Lex extra-compiler for handling files specified in the LEXSOURCES variable
#

isEmpty(LEX_DIR): LEX_DIR = .

defineReplace(lexCommands) {
    input = $$relative_path($$absolute_path($$1, $$OUT_PWD), $$OUT_PWD/$$LEX_DIR)
    output = $$basename(2)
    input_base = $$basename(1)
    input_base ~= s/\.[^.]*$//

    isEmpty(QMAKE_LEXFLAGS_MANGLE): QMAKE_LEXFLAGS_MANGLE = -P$${input_base}
    QMAKE_LEXEXTRAFLAGS = $$QMAKE_LEXFLAGS
    !yacc_no_name_mangle: QMAKE_LEXEXTRAFLAGS += $$QMAKE_LEXFLAGS_MANGLE

    contains(QMAKE_LEX, .*flex) {
        # GNU flex, we can use -o outfile
        commands = $$QMAKE_LEX $$QMAKE_LEXEXTRAFLAGS --nounistd -o $$output $$input
    } else {
        # stupid POSIX lex, it only generates a file called lex.yy.c
        # or lex.prefix.c if the -P<prefix> option is active
        intermediate_file = lex.yy.c
        QMAKE_LEXEXTRAFLAGS = $$QMAKE_LEXFLAGS $$QMAKE_LEXFLAGS_MANGLE

        commands = \
            -$(DEL_FILE) $${output}$$escape_expand(\\n\\t) \
            $$QMAKE_LEX $$QMAKE_LEXEXTRAFLAGS $${input}$$escape_expand(\\n\\t) \
            $(MOVE) $$intermediate_file $$output $$escape_expand(\\n\\t)
    }
    !equals(LEX_DIR, .): \
        commands = cd $$LEX_DIR && $$commands
    silent: commands = @echo Lex $$1 && $$commands
    return($$commands)
}

{
    lex.name = Lex ${QMAKE_FILE_IN}
    lex.input = LEXSOURCES
    lex.dependency_type = TYPE_C
    lex_included {
        lex.CONFIG += no_link
    } else {
        lex.variable_out = GENERATED_SOURCES
    }

    lex.commands = ${QMAKE_FUNC_lexCommands}
    lex.output = $$LEX_DIR/$${QMAKE_CPP_MOD_MOC}${QMAKE_FILE_BASE}$${QMAKE_MOD_LEX}$${first(QMAKE_EXT_CPP)}
    QMAKE_EXTRA_COMPILERS += lex
}