Modification of https://github.com/bazelbuild/examples/cpp-tutorial/stage3 to demonstrate conan & bazel 7

This repo is a clone of https://github.com/bazelbuild/examples/cpp-tutorial/stage3, fixed for bazel 7 and enhanced to demonstrate usage of conan dependencies

Fixes for bazel 7

• .bazelrc changes
• remove WORKSPACE content
• add MODULE.bazel
• specify bazel version 7.2.0rc2

Conan demo

• conan artifact definitions added to deps/conan
• deps/conan/conan_extension.bzl added. This should be autogenerated by conan
• deps/conan/artifacts.MODULE.bazel added. This should be autogenerated by conan.
• include line added to MODULE.bazel, including deps/conan/artifacts.MODULE.bazel. include statements require bazel 7.2.0 (7.2.0rc2 is available and works). For use pre-7.2.0, the lines in artifacts.MODULE.bazel can be inlined into MODULE.bazel

Conan install

• cd %workspace%
• conan install deps/conan/conanfile.py

Manual hacks to fixup conan's current autogen content

• deps/conan/conan/dependencies.bzl manually hacked after conan generation to fix existing issues
• deps/conan/conan/dependencies.bzl hacked to make compatible with bazel modules
• deps/conan/conan/zlib/BUILD.bazel hacked to add missing dependency on zlib.dll
• resulting files after hacks are checked into deps/conan/conan-hacks for demo purposes

Build

• bazel build //...

Stage 3

In this stage we step it up and showcase how to integrate multiple cc_library targets from different packages.

Below, we see a similar configuration from Stage 2, except that this BUILD file is in a subdirectory called lib. In Bazel, subdirectories containing BUILD files are known as packages. The new property visibility will tell Bazel which package(s) can reference this target, in this case the //main package can use hello-time library.

cc_library(
    name = "hello-time",
    srcs = ["hello-time.cc"],
    hdrs = ["hello-time.h"],
    visibility = ["//main:__pkg__"],
)

To use our hello-time library, an extra dependency is added in the form of //path/to/package:target_name, in this case, it's //lib:hello-time

cc_binary(
    name = "hello-world",
    srcs = ["hello-world.cc"],
    deps = [
        ":hello-greet",
        "//lib:hello-time",
    ],
)

To build this example, use

bazel build //main:hello-world