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*: transfer back to cmake from autotools autotools just made lots of things more complicated than they should have and many things broke (i.e. translations)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 05:56:06 -0400
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1 # Bazel support
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3 To get [Bazel](https://bazel.build/) working with {fmt} you can copy the files `BUILD.bazel`, `WORKSPACE.bazel`, and `.bazelversion` from this folder (`support/bazel`) to the root folder of this project. This way {fmt} gets bazelized and can be used with Bazel (e.g. doing a `bazel build //...` on {fmt}).
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5 ## Using {fmt} as a dependency
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7 The following minimal example shows how to use {fmt} as a dependency within a Bazel project.
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8
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9 The following file structure is assumed:
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10
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11 ```
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12 example
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13 ├── BUILD.bazel
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14 ├── main.cpp
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15 └── WORKSPACE.bazel
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16 ```
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17
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18 *main.cpp*:
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19
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20 ```c++
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21 #include "fmt/core.h"
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22
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23 int main() {
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24 fmt::print("The answer is {}\n", 42);
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25 }
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26 ```
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27
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28 The expected output of this example is `The answer is 42`.
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29
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30 *WORKSPACE.bazel*:
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31
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32 ```python
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33 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
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34
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35 git_repository(
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36 name = "fmt",
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37 branch = "master",
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38 remote = "https://github.com/fmtlib/fmt",
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39 patch_cmds = [
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40 "mv support/bazel/.bazelversion .bazelversion",
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41 "mv support/bazel/BUILD.bazel BUILD.bazel",
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42 "mv support/bazel/WORKSPACE.bazel WORKSPACE.bazel",
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43 ],
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44 # Windows-related patch commands are only needed in the case MSYS2 is not installed.
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45 # More details about the installation process of MSYS2 on Windows systems can be found here:
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46 # https://docs.bazel.build/versions/main/install-windows.html#installing-compilers-and-language-runtimes
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47 # Even if MSYS2 is installed the Windows related patch commands can still be used.
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48 patch_cmds_win = [
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49 "Move-Item -Path support/bazel/.bazelversion -Destination .bazelversion",
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50 "Move-Item -Path support/bazel/BUILD.bazel -Destination BUILD.bazel",
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51 "Move-Item -Path support/bazel/WORKSPACE.bazel -Destination WORKSPACE.bazel",
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52 ],
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53 )
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54 ```
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55
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56 In the *WORKSPACE* file, the {fmt} GitHub repository is fetched. Using the attribute `patch_cmds` the files `BUILD.bazel`, `WORKSPACE.bazel`, and `.bazelversion` are moved to the root of the {fmt} repository. This way the {fmt} repository is recognized as a bazelized workspace.
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57
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58 *BUILD.bazel*:
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59
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60 ```python
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61 cc_binary(
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62 name = "Demo",
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63 srcs = ["main.cpp"],
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64 deps = ["@fmt"],
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65 )
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66 ```
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67
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68 The *BUILD* file defines a binary named `Demo` that has a dependency to {fmt}.
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70 To execute the binary you can run `bazel run //:Demo`.
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71
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72 # Using Bzlmod
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73
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74 The [Bazel Central Registry](https://github.com/bazelbuild/bazel-central-registry/tree/main/modules/fmt) also provides support for {fmt}.