src/Android.bp

cc_binary_host {
    // Not named "flex" because we need the flex module to build scan.l below,
    // and we don't support dependency loops. The stem renames this back to
    // 'flex' in the installed path
    name: "flex_bin",
    stem: "flex",

    stl: "none",
    srcs: [
        "ccl.c",
        "dfa.c",
        "ecs.c",
        "scanflags.c",
        "gen.c",
        "main.c",
        "misc.c",
        "nfa.c",
        "parse.y",
        "scan.l",
        "sym.c",
        "tblcmp.c",
        "yylex.c",
        "options.c",
        "scanopt.c",
        "buf.c",
        "tables.c",
        "tables_shared.c",
        "filter.c",
        "regex.c",

        ":flex_skel.c",
    ],

    cflags: [
        "-DHAVE_ALLOCA=1",
        "-DHAVE_LIMITS_H=1",
        "-DHAVE_UNISTD_H=1",
        "-DHAVE_NETINET_IN_H=1",
        "-DHAVE_SYS_WAIT_H=1",
        "-DHAVE_STDBOOL_H=1",
        "-DHAVE_REGEX_H=1",
        "-DSTDC_HEADERS=1",
        "-DVERSION=\"2.6.4\"",

        // TODO: This should use a hermetic m4 -- this is a default that can be overwritten
        // overwritten with the M4 environment variable, which may be simpler within the build.
        "-DM4=\"m4\"",

        "-Wno-pointer-sign",

        "-Wno-unused-parameter",
        "-Wno-unused-variable",
        "-Wno-unused-label",

        "-Wno-error=dangling-else",
        "-Wno-error=incompatible-pointer-types-discards-qualifiers",
        "-Wno-error=int-conversion",
    ],
}

genrule {
    name: "flex_skel.c",
    // This is lightly modified from Makefile.am
    cmd: "/bin/bash $(location mkskel.sh) `dirname $(in)` $(location m4) 2.6.4 >$(out)",
    tool_files: [
        "mkskel.sh",
        "flexint.h",
        "tables_shared.c",
        "tables_shared.h",
    ],
    tools: ["m4"],
    srcs: [
        "flex.skl",
    ],
    out: [
        "skel.c",
    ],
}