extensions/Android.bp

cc_defaults {
    name: "libext_defaults",
    defaults: ["iptables_defaults"],

    header_libs: ["iptables_config_header"],

    cflags: [
        "-DNO_SHARED_LIBS=1",
        "-DXTABLES_INTERNAL",

        "-Wno-format",
        "-Wno-missing-field-initializers",
        // libxt_recent.c:202:11: error: address of array 'info->name' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
        "-Wno-pointer-bool-conversion",
        "-Wno-tautological-pointer-compare",
    ],
}

// All of the extension source files have the same function name (_init). Since we don't support
// per-file cflags that upstream uses, instead:
//
//  1. Rewrite the source files with filter_init to have per-file function names. (libext*_srcs)
//  2. Create a new source file that defines a function (init_extensions*) with gen_init that calls
//     all of the renamed _init functions (libext*_init)
//
// This all happens three times -- once each for libext, libext4, libext6

genrule {
    name: "libext_init",
    cmd: "$(location gen_init) '' $(locations libxt_*.c) > $(out)",
    srcs: [
        "gen_init",
        "libxt_*.c",
    ],
    out: ["initext.c"],
    exclude_srcs: [
        // Exclude some modules that are problematic to compile (types/headers)
        "libxt_TCPOPTSTRIP.c",
        "libxt_connlabel.c",
        "libxt_cgroup.c",

        "libxt_dccp.c",
        "libxt_ipvs.c",
    ],
}

gensrcs {
    name: "libext_srcs",
    tool_files: ["filter_init"],
    cmd: "$(location filter_init) $(in) > $(out)",
    output_extension: "c",
    srcs: ["libxt_*.c"],
    exclude_srcs: [
        // Exclude some modules that are problematic to compile (types/headers)
        "libxt_TCPOPTSTRIP.c",
        "libxt_connlabel.c",
        "libxt_cgroup.c",

        "libxt_dccp.c",
        "libxt_ipvs.c",
    ],
}

cc_library_static {
    name: "libext",
    defaults: ["libext_defaults"],
    srcs: [
        ":libext_init",
        ":libext_srcs",
    ],
}

////////////////////////////////////////////////////////////////////////////////////////////////////

genrule {
    name: "libext4_init",
    cmd: "$(location gen_init) '4' $(locations libipt_*.c) > $(out)",
    srcs: [
        "gen_init",
        "libipt_*.c",
    ],
    out: ["initext.c"],
}

gensrcs {
    name: "libext4_srcs",
    tool_files: ["filter_init"],
    cmd: "$(location filter_init) $(in) > $(out)",
    output_extension: "c",
    srcs: ["libipt_*.c"],
}

cc_library_static {
    name: "libext4",
    defaults: ["libext_defaults"],
    srcs: [
        ":libext4_init",
        ":libext4_srcs",
    ],
}

////////////////////////////////////////////////////////////////////////////////////////////////////

genrule {
    name: "libext6_init",
    cmd: "$(location gen_init) '6' $(locations libip6t_*.c) > $(out)",
    srcs: [
        "gen_init",
        "libip6t_*.c",
    ],
    out: ["initext.c"],
}

gensrcs {
    name: "libext6_srcs",
    tool_files: ["filter_init"],
    cmd: "$(location filter_init) $(in) > $(out)",
    output_extension: "c",
    srcs: ["libip6t_*.c"],
}

cc_library_static {
    name: "libext6",
    defaults: ["libext_defaults"],
    srcs: [
        ":libext6_init",
        ":libext6_srcs",
    ],
}