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Use as a Bazel Dependency

To use libcbor in your Baze project, first add the following section to your project's WORKSPACE file. Note the location of the third_party/libcbor.BUILD file - you may use a different location if you wish, but you the file must be make available to WORKSPACE.

WORKSPACE

Note, this imports version 0.8.0 - you may need to update the version and the sha256 hash.

# libcbor
http_archive(
    name = "libcbor",
    build_file = "//third_party:libcbor.BUILD",
    sha256 = "dd04ea1a7df484217058d389e027e7a0143a4f245aa18a9f89a5dd3e1a4fcc9a",
    strip_prefix = "libcbor-0.8.0",
    urls = ["https://github.com/PJK/libcbor/archive/refs/tags/v0.8.0.zip"],
)

third_party/libcbor.BUILD

Bazel will unzip the libcbor zip file, then copy this file in as BUILD. Bazel will then use this file to compile libcbor. Cmake is used in two passes: to create the Makefiles, and then to invoke Make to build the libcbor.a static library. libcbor.a and the .h files are then made available for other packages to use.

genrule(
  name = "cbor_cmake",
  srcs = glob(["**"]),
  outs = ["libcbor.a", "cbor.h", "cbor/arrays.h", "cbor/bytestrings.h",
          "cbor/callbacks.h", "cbor/cbor_export.h", "cbor/common.h", "cbor/configuration.h", "cbor/data.h",
          "cbor/encoding.h", "cbor/floats_ctrls.h", "cbor/ints.h", "cbor/maps.h",
          "cbor/serialization.h", "cbor/streaming.h", "cbor/strings.h", "cbor/tags.h"],
  cmd = " && ".join([
    # Remember where output should go.
    "INITIAL_WD=`pwd`",
    # Build libcbor library.
    "cd `dirname $(location CMakeLists.txt)`",
    "cmake -DCMAKE_BUILD_TYPE=Release .",
    "cmake --build .",
    # Export the .a and .h files for cbor rule, below.
    "cp src/libcbor.a src/cbor.h $$INITIAL_WD/$(RULEDIR)",
    "cp src/cbor/*h cbor/configuration.h $$INITIAL_WD/$(RULEDIR)/cbor"]),
  visibility = ["//visibility:private"],
)

cc_import(
  name = "cbor",
  hdrs = ["cbor.h", "cbor/arrays.h", "cbor/bytestrings.h",
          "cbor/callbacks.h", "cbor/cbor_export.h", "cbor/common.h", "cbor/configuration.h", "cbor/data.h",
          "cbor/encoding.h", "cbor/floats_ctrls.h", "cbor/ints.h", "cbor/maps.h",
          "cbor/serialization.h", "cbor/streaming.h", "cbor/strings.h", "cbor/tags.h"],
  static_library = "libcbor.a",
  visibility = ["//visibility:public"],
)

third_party/BUILD

The libcbor.BUILD file must be make available to the top-level WORKSPACE file:

exports_files(["libcbor.BUILD"]))

Your BUILD File

Add libcbor dependency to your package's BUILD file like so:

cc_library(
    name = "...",
    srcs = [ ... ],
    hdrs = [ ... ],
    deps = [
        ...
        "@libcbor//:cbor",
    ],
)

Your C File

Now you may simply include cbor.h:

#include "cbor.h"

static const uint8_t version = cbor_major_version;