D rules

Rules

Rules

• d_library
• d_source_library
• d_binary
• d_test
• d_docs

Setup

To use the D rules, add the following to your WORKSPACE file to add the external repositories for the D toolchain:

load("/tools/build_defs/d/d", "d_repositories")

d_repositories()

Roadmap

• Generate documentation using ddox for d_docs rule.
• Support for other options as defined in the Dub package format
• Support for specifying different configurations of a library, closer to Dub's model for configurations
• Workspace rule for retrieving dependencies from Dub

d_library

d_library(name, srcs, deps, includes, linkopts, versions)

Attributes
name	Name, required A unique name for this rule. This name will be used as the name of the library built by this rule.
srcs	List of labels, required List of D .d source files used to build the library.
deps	List of labels, optional List of libraries to be linked to this library target. These can either be other d_library targets, source-only d_source_library targets, or cc_library targets if linking a native library.
imports	List of strings, optional List of import dirs to add to the compile line. These will be passed to the D compiler via -I flags.
linkopts	List of strings, optional List of flags that are added to the D linker command. These will be passed to the D compiler via -L flags.
versions	List of strings, optional List of versions to be defined during compilation. Versions are used for conditional compilation and are enabled in the code using version condition blocks. These versions listed here will be passed to the D compiler using -version flags.

Example

Suppose you have the following directory structure for a D project:

[workspace]/
    WORKSPACE
    foo/
        BUILD
        foo.d
        bar.d
        baz.d

The library foo is built using a d_library target:

foo/BUILD:

load("/tools/build_defs/d/d", "d_library")

d_binary(
    name = "foo",
    srcs = [
        "foo.d",
        "bar.d",
        "baz.d",
    ],
)

d_source_library

d_source_library(name, srcs, deps, includes, linkopts, versions)

Attributes
name	Name, required A unique name for this rule.
srcs	List of labels, required List of D .d source files that comprises this source library target.
deps	List of labels, optional List of library targets depended on by this target. These can either be other d_source_library targets or cc_library targets, such as when this source library target implements the D interface for a native library. Any native libraries will be linked by d_library targets that depend on this target.
imports	List of strings, optional List of import dirs to add to the compile line. These will be passed to the D compiler via -I flags for any d_library targets that depend on this target.
linkopts	List of strings, optional List of flags that are added to the D linker command. These will be passed to the D compiler via -L flags for any d_library targets that depend on this target.
versions	List of strings, optional List of version flags to be defined during compilation. Versions are used for conditional compilation and are enabled in the code using version condition blocks. These versions listed here will be passed to the D compiler using -version flags for any d_library targets that depend on this target.

Example

Suppose you have the following directory structure for a project building a C library and a D interface for the C library:

[workspace]/
    WORKSPACE
    greeter/
        BUILD
        native_greeter.c
        native_greeter.h
        native_greeter.d
    hello_world
        BUILD
        hello_world.d

Build the C library using the cc_library rule and then use the d_source_library to define the target for the D interface for the C native_greeter library:

greeter/BUILD:

load("/tools/build_defs/d/d", "d_source_library")

cc_library(
    name = "native_greeter_lib",
    srcs = ["native_greeter.c"],
    hdrs = ["native_greeter.h"],
)

d_source_library(
    name = "native_greeter",
    srcs = ["native_greeter.d"],
    deps = [":native_greeter_lib"],
)

Other targets can directly depend on the d_source_library target to link the C library:

hello_world/BUILD:

load("/tools/build_defs/d/d", "d_source_library")

d_binary(
    name = "hello_world",
    srcs = ["hello_world.d"],
    deps = ["//greeter:native_greeter"],
)

d_binary

d_binary(name, srcs, deps, includes, linkopts, versions)

Attributes
name	Name, required A unique name for this rule. This name will be used as the name of the binary built by this rule.
srcs	List of labels, required List of D .d source files used to build the binary.
deps	List of labels, optional List of libraries to be linked to this binary target. These can either be other d_library targets, source-only d_source_library targets, or cc_library targets if linking a native library.
imports	List of strings, optional List of import dirs to add to the compile line. These will be passed to the D compiler via -I flags.
linkopts	List of strings, optional List of flags that are added to the D linker command. These will be passed to the D compiler via -L flags.
versions	List of strings, optional List of versions to be defined during compilation. Versions are used for conditional compilation and are enabled in the code using version condition blocks. These versions listed here will be passed to the D compiler using -version flags.

Suppose you have the following directory structure for a D project:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        greeter.d
    hello_world
        BUILD
        hello_world.d

The source file hello_lib/greeter.d defines a module greeter:

module greeter;
...

The hello_lib library is built using a d_library target:

hello_lib/BUILD:

load("/tools/build_defs/d/d", "d_library")

d_library(
    name = "hello_lib",
    srcs = ["greeter.d"],
)

By default, import paths are from the root of the workspace. Thus, the source for the hello_world binary, hello_world.d, would import the greeter module as follows:

import hello_lib.greeter;

However, this can be changed via the imports attribute on the d_library rule.

The hello_world binary is built using a d_binary target:

hello_world/BUILD:

load("/tools/build_defs/d/d", "d_library")

d_binary(
    name = "hello_world",
    srcs = ["hello_world.d"],
    deps = ["//hello_lib"],
)

d_test

d_test(name, srcs, deps, includes, linkopts, versions)

Attributes
name	Name, required A unique name for this rule. This name will be used as the name of the test built by this rule.
srcs	List of labels, required List of D .d source files used to build the test.
deps	List of labels, optional List of libraries to be linked to this test target. These can either be other d_library targets, source-only d_source_library targets, or cc_library targets if linking a native library.
imports	List of strings, optional List of import dirs to add to the compile line. These will be passed to the D compiler via -I flags.
linkopts	List of strings, optional List of flags that are added to the D linker command. These will be passed to the D compiler via -L flags.
versions	List of strings, optional List of versions to be defined during compilation. Versions are used for conditional compilation and are enabled in the code using version condition blocks. These versions listed here will be passed to the D compiler using -version flags.

Example

Suppose you have the following directory structure for a D project:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        greeter.d
        greeter_test.d

hello_lib/greeter.d:

module greeter;

import std.stdio;
import std.string;

class Greeter {
 private string greeting;

 public:
  this(in string greeting) {
    this.greeting = greeting.dup;
  }

  string makeGreeting(in immutable string thing) {
    return format("%s %s!", this.greeting, thing);
  }

  void greet(in immutable string thing) {
    writeln(makeGreeting(thing));
  }
}

hello_lib/greeter_test.d:

import hello_lib.greeter;

unittest {
  auto greeter = new Greeter("Hello");
  assert(greeter.makeGreeting("world") == "Hello world!");
}

void main() {}

To build the library and unit test:

hello_lib/BUILD:

load("/tools/build_defs/d/d", "d_library", "d_test")

d_library(
    name = "greeter",
    srcs = ["greeter.d"],
)

d_test(
    name = "greeter_test",
    srcs = ["greeter_test.d"],
    deps = [":greeter"],
)

The unit test can then be run using:

bazel test //hello_lib:greeter_test

d_docs

d_docs(name, dep)

Attributes
name	Name, required A unique name for this rule.
dep	Label, required The label of the target to generate code documentation for. d_docs can generate HTML code documentation for the source files of d_library, d_source_library, d_binary, or d_test targets.

Example

Suppose you have the following directory structure for a D project:

[workspace]/
    WORKSPACE
    foo/
        BUILD
        foo.d
        bar.d
        baz.d

The foo/ directory contains the sources for the d_library foo. To generate HTML documentation for the foo library, define a d_docs target that takes the d_library foo as its dependency:

foo/BUILD:

load("/tools/build_defs/d/d", "d_library", "d_docs")

d_library(
    name = "foo",
    srcs = [
        "foo.d",
        "bar.d",
        "baz.d",
    ],
)

d_docs(
    name = "foo_docs",
    dep = ":foo",
)

Running bazel build //foo:foo_docs will generate a zip file containing the HTML documentation generated from the source files. See the official D language documentation on the Documentation Generator for more information on the conventions for source documentation.