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74 lines
2.4 KiB
Markdown
74 lines
2.4 KiB
Markdown
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# Bazel support
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To get [Bazel](https://bazel.build/) working with {fmt} you can copy the files `BUILD.bazel`, `WORKSPACE.bazel`, `.bazelrc`, 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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## Using {fmt} as a dependency
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The following minimal example shows how to use {fmt} as a dependency within a Bazel project.
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The following file structure is assumed:
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```
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example
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├── BUILD.bazel
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├── main.cpp
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└── WORKSPACE.bazel
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```
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*main.cpp*:
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```c++
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#include "fmt/core.h"
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int main() {
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fmt::print("The answer is {}\n", 42);
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}
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```
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The expected output of this example is `The answer is 42`.
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*WORKSPACE.bazel*:
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```python
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load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
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git_repository(
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name = "fmt",
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branch = "master",
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remote = "https://github.com/fmtlib/fmt",
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patch_cmds = [
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"mv support/bazel/.bazelrc .bazelrc",
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"mv support/bazel/.bazelversion .bazelversion",
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"mv support/bazel/BUILD.bazel BUILD.bazel",
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"mv support/bazel/WORKSPACE.bazel WORKSPACE.bazel",
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],
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# Windows-related patch commands are only needed in the case MSYS2 is not installed.
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# More details about the installation process of MSYS2 on Windows systems can be found here:
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# https://docs.bazel.build/versions/main/install-windows.html#installing-compilers-and-language-runtimes
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# Even if MSYS2 is installed the Windows related patch commands can still be used.
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patch_cmds_win = [
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"Move-Item -Path support/bazel/.bazelrc -Destination .bazelrc",
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"Move-Item -Path support/bazel/.bazelversion -Destination .bazelversion",
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"Move-Item -Path support/bazel/BUILD.bazel -Destination BUILD.bazel",
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"Move-Item -Path support/bazel/WORKSPACE.bazel -Destination WORKSPACE.bazel",
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],
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)
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```
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In the *WORKSPACE* file, the {fmt} GitHub repository is fetched. Using the attribute `patch_cmds` the files `BUILD.bazel`, `WORKSPACE.bazel`, `.bazelrc`, 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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*BUILD.bazel*:
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```python
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cc_binary(
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name = "Demo",
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srcs = ["main.cpp"],
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deps = ["@fmt"],
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)
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```
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The *BUILD* file defines a binary named `Demo` that has a dependency to {fmt}.
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To execute the binary you can run `bazel run //:Demo`.
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