rules_foreign_cc/main/cmake.html

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<ol class="chapter"><li class="chapter-item expanded "><a href="index.html"><strong aria-hidden="true">1.</strong> Rules ForeignCc</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="rules.html"><strong aria-hidden="true">1.1.</strong> Rules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="cmake.html" class="active"><strong aria-hidden="true">1.1.1.</strong> cmake</a></li><li class="chapter-item expanded "><a href="configure_make.html"><strong aria-hidden="true">1.1.2.</strong> configure_make</a></li><li class="chapter-item expanded "><a href="make.html"><strong aria-hidden="true">1.1.3.</strong> make</a></li><li class="chapter-item expanded "><a href="ninja.html"><strong aria-hidden="true">1.1.4.</strong> ninja</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="flatten.html"><strong aria-hidden="true">2.</strong> Full API</a></li></ol> </div>
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<h1 class="menu-title">Rules ForeignCc</h1>
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<h1 id="a-hrefcmakecmakea"><a class="header" href="#a-hrefcmakecmakea"><a href="#cmake">CMake</a></a></h1>
<h2 id="building-cmake-projects"><a class="header" href="#building-cmake-projects">Building CMake projects</a></h2>
<ul>
<li>Build libraries/binaries with CMake from sources using cmake rule</li>
<li>Use cmake targets in <a href="https://docs.bazel.build/versions/master/be/c-cpp.html#cc_library">cc_library</a>, <a href="https://docs.bazel.build/versions/master/be/c-cpp.html#cc_binary">cc_binary</a> targets as dependency</li>
<li>Bazel <a href="https://docs.bazel.build/versions/master/be/c-cpp.html#cc_toolchain">cc_toolchain</a> parameters are used inside cmake build</li>
<li>See full list of cmake arguments below 'example'</li>
<li>Works on Ubuntu, Mac OS and Windows (<em>see special notes below in Windows section</em>) operating systems</li>
</ul>
<p><strong>Example:</strong>
(Please see full examples in ./examples)</p>
<p>The example for <strong>Windows</strong> is below, in the section 'Usage on Windows'.</p>
<ul>
<li>In <code>WORKSPACE.bazel</code>, we use a <code>http_archive</code> to download tarballs with the libraries we use.</li>
<li>In <code>BUILD.bazel</code>, we instantiate a <code>cmake</code> rule which behaves similarly to a <a href="https://docs.bazel.build/versions/master/be/c-cpp.html#cc_library">cc_library</a>, which can then be used in a C++ rule (<a href="https://docs.bazel.build/versions/master/be/c-cpp.html#cc_binary">cc_binary</a> in this case).</li>
</ul>
<p>In <code>WORKSPACE.bazel</code>, put</p>
<pre><code class="language-python">workspace(name = &quot;rules_foreign_cc_usage_example&quot;)
load(&quot;@bazel_tools//tools/build_defs/repo:http.bzl&quot;, &quot;http_archive&quot;)
# Rule repository, note that it's recommended to use a pinned commit to a released version of the rules
http_archive(
name = &quot;rules_foreign_cc&quot;,
sha256 = &quot;c2cdcf55ffaf49366725639e45dedd449b8c3fe22b54e31625eb80ce3a240f1e&quot;,
strip_prefix = &quot;rules_foreign_cc-0.1.0&quot;,
url = &quot;https://github.com/bazelbuild/rules_foreign_cc/archive/0.1.0.zip&quot;,
)
load(&quot;@rules_foreign_cc//foreign_cc:repositories.bzl&quot;, &quot;rules_foreign_cc_dependencies&quot;)
# This sets up some common toolchains for building targets. For more details, please see
# https://github.com/bazelbuild/rules_foreign_cc/tree/main/docs#rules_foreign_cc_dependencies
rules_foreign_cc_dependencies()
_ALL_CONTENT = &quot;&quot;&quot;\
filegroup(
name = &quot;all_srcs&quot;,
srcs = glob([&quot;**&quot;]),
visibility = [&quot;//visibility:public&quot;],
)
&quot;&quot;&quot;
# pcre source code repository
http_archive(
name = &quot;pcre&quot;,
build_file_content = _ALL_CONTENT,
strip_prefix = &quot;pcre-8.43&quot;,
urls = [
&quot;https://mirror.bazel.build/ftp.pcre.org/pub/pcre/pcre-8.43.tar.gz&quot;,
&quot;https://ftp.pcre.org/pub/pcre/pcre-8.43.tar.gz&quot;,
],
sha256 = &quot;0b8e7465dc5e98c757cc3650a20a7843ee4c3edf50aaf60bb33fd879690d2c73&quot;,
)
</code></pre>
<p>And in the <code>BUILD.bazel</code> file, put:</p>
<pre><code class="language-python">load(&quot;@rules_foreign_cc//foreign_cc:defs.bzl&quot;, &quot;cmake&quot;)
cmake(
name = &quot;pcre&quot;,
cache_entries = {
&quot;CMAKE_C_FLAGS&quot;: &quot;-fPIC&quot;,
},
lib_source = &quot;@pcre//:all_srcs&quot;,
out_static_libs = [&quot;libpcre.a&quot;],
)
</code></pre>
<p>then build as usual:</p>
<pre><code class="language-bash">bazel build //:pcre
</code></pre>
<p><strong>Usage on Windows</strong></p>
<p>When using on Windows, you should start Bazel in MSYS2 shell, as the shell script inside cmake assumes this.
Also, you should explicitly specify <strong>make commands and option to generate CMake crosstool file</strong>.</p>
<p>The default generator for CMake will be detected automatically, or you can specify it explicitly.</p>
<p><strong>The tested generators:</strong> Visual Studio 15, Ninja and NMake.
The extension <code>.lib</code> is assumed for the static libraries by default.</p>
<p>Example usage (see full example in <code>./examples/cmake_hello_world_lib</code>):
Example assumes that MS Visual Studio and Ninja are installed on the host machine, and Ninja bin directory is added to PATH.</p>
<pre><code class="language-python">cmake(
# expect to find ./lib/hello.lib as the result of the build
name = &quot;hello&quot;,
# This option can be omitted
generate_args = [
&quot;-G \&quot;Visual Studio 15 2017\&quot;&quot;,
&quot;-A Win64&quot;,
],
lib_source = &quot;:srcs&quot;,
)
cmake(
name = &quot;hello_ninja&quot;,
# expect to find ./lib/hello.lib as the result of the build
lib_name = &quot;hello&quot;,
# explicitly specify the generator
generate_args = [&quot;-GNinja&quot;],
lib_source = &quot;:srcs&quot;,
)
cmake(
name = &quot;hello_nmake&quot;,
# explicitly specify the generator
generate_args = [&quot;-G \&quot;NMake Makefiles\&quot;&quot;],
lib_source = &quot;:srcs&quot;,
# expect to find ./lib/hello.lib as the result of the build
out_static_libs = [&quot;hello.lib&quot;],
)
</code></pre>
<p><a id="#cmake"></a></p>
<h2 id="cmake"><a class="header" href="#cmake">cmake</a></h2>
<pre>
cmake(<a href="#cmake-name">name</a>, <a href="#cmake-additional_inputs">additional_inputs</a>, <a href="#cmake-additional_tools">additional_tools</a>, <a href="#cmake-alwayslink">alwayslink</a>, <a href="#cmake-build_args">build_args</a>, <a href="#cmake-build_data">build_data</a>, <a href="#cmake-cache_entries">cache_entries</a>,
<a href="#cmake-data">data</a>, <a href="#cmake-defines">defines</a>, <a href="#cmake-deps">deps</a>, <a href="#cmake-env">env</a>, <a href="#cmake-generate_args">generate_args</a>, <a href="#cmake-generate_crosstool_file">generate_crosstool_file</a>, <a href="#cmake-install">install</a>, <a href="#cmake-install_args">install_args</a>,
<a href="#cmake-lib_name">lib_name</a>, <a href="#cmake-lib_source">lib_source</a>, <a href="#cmake-linkopts">linkopts</a>, <a href="#cmake-out_bin_dir">out_bin_dir</a>, <a href="#cmake-out_binaries">out_binaries</a>, <a href="#cmake-out_data_dirs">out_data_dirs</a>, <a href="#cmake-out_headers_only">out_headers_only</a>,
<a href="#cmake-out_include_dir">out_include_dir</a>, <a href="#cmake-out_interface_libs">out_interface_libs</a>, <a href="#cmake-out_lib_dir">out_lib_dir</a>, <a href="#cmake-out_shared_libs">out_shared_libs</a>, <a href="#cmake-out_static_libs">out_static_libs</a>,
<a href="#cmake-postfix_script">postfix_script</a>, <a href="#cmake-targets">targets</a>, <a href="#cmake-tool_prefix">tool_prefix</a>, <a href="#cmake-tools_deps">tools_deps</a>, <a href="#cmake-working_directory">working_directory</a>)
</pre>
<p>Rule for building external library with CMake.</p>
<p><strong>ATTRIBUTES</strong></p>
<table><thead><tr><th align="left">Name</th><th align="left">Description</th><th align="left">Type</th><th align="left">Mandatory</th><th align="left">Default</th></tr></thead><tbody>
<tr><td align="left"><a id="cmake-name"></a>name</td><td align="left">A unique name for this target.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#name">Name</a></td><td align="left">required</td><td align="left"></td></tr>
<tr><td align="left"><a id="cmake-additional_inputs"></a>additional_inputs</td><td align="left"><strong>deprecated</strong>: Please use the <code>build_data</code> attribute.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-additional_tools"></a>additional_tools</td><td align="left"><strong>deprecated</strong>: Please use the <code>build_data</code> attribute.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-alwayslink"></a>alwayslink</td><td align="left">Optional. if true, link all the object files from the static library, even if they are not used.</td><td align="left">Boolean</td><td align="left">optional</td><td align="left">False</td></tr>
<tr><td align="left"><a id="cmake-build_args"></a>build_args</td><td align="left">Arguments for the CMake build command</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-build_data"></a>build_data</td><td align="left">Files needed by this rule only during build/compile time. May list file or rule targets. Generally allows any target.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-cache_entries"></a>cache_entries</td><td align="left">CMake cache entries to initialize (they will be passed with <code>-Dkey=value</code>) Values, defined by the toolchain, will be joined with the values, passed here. (Toolchain values come first)</td><td align="left"><a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -&gt; String</a></td><td align="left">optional</td><td align="left">{}</td></tr>
<tr><td align="left"><a id="cmake-data"></a>data</td><td align="left">Files needed by this rule at runtime. May list file or rule targets. Generally allows any target.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-defines"></a>defines</td><td align="left">Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options.</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-deps"></a>deps</td><td align="left">Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule)</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-env"></a>env</td><td align="left">Environment variables to set during the build. <code>$(execpath)</code> macros may be used to point at files which are listed as <code>data</code>, <code>deps</code>, or <code>build_data</code>, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported.</td><td align="left"><a href="https://bazel.build/docs/skylark/lib/dict.html">Dictionary: String -&gt; String</a></td><td align="left">optional</td><td align="left">{}</td></tr>
<tr><td align="left"><a id="cmake-generate_args"></a>generate_args</td><td align="left">Arguments for CMake's generate command. Arguments should be passed as key/value pairs. eg: <code>[&quot;-G Ninja&quot;, &quot;--debug-output&quot;, &quot;-DFOO=bar&quot;]</code>. Note that unless a generator (<code>-G</code>) argument is provided, the default generators are <a href="https://cmake.org/cmake/help/latest/generator/Unix%20Makefiles.html">Unix Makefiles</a> for Linux and MacOS and <a href="https://cmake.org/cmake/help/latest/generator/Ninja.html">Ninja</a> for Windows.</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-generate_crosstool_file"></a>generate_crosstool_file</td><td align="left">When True, CMake crosstool file will be generated from the toolchain values, provided cache-entries and env_vars (some values will still be passed as <code>-Dkey=value</code> and environment variables). If <code>CMAKE_TOOLCHAIN_FILE</code> cache entry is passed, specified crosstool file will be used When using this option to cross-compile, it is required to specify <code>CMAKE_SYSTEM_NAME</code> in the cache_entries</td><td align="left">Boolean</td><td align="left">optional</td><td align="left">True</td></tr>
<tr><td align="left"><a id="cmake-install"></a>install</td><td align="left">If True, the <code>cmake --install</code> comand will be performed after a build</td><td align="left">Boolean</td><td align="left">optional</td><td align="left">True</td></tr>
<tr><td align="left"><a id="cmake-install_args"></a>install_args</td><td align="left">Arguments for the CMake install command</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-lib_name"></a>lib_name</td><td align="left">Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name.</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;&quot;</td></tr>
<tr><td align="left"><a id="cmake-lib_source"></a>lib_source</td><td align="left">Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">Label</a></td><td align="left">required</td><td align="left"></td></tr>
<tr><td align="left"><a id="cmake-linkopts"></a>linkopts</td><td align="left">Optional link options to be passed up to the dependencies of this library</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-out_bin_dir"></a>out_bin_dir</td><td align="left">Optional name of the output subdirectory with the binary files, defaults to 'bin'.</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;bin&quot;</td></tr>
<tr><td align="left"><a id="cmake-out_binaries"></a>out_binaries</td><td align="left">Optional names of the resulting binaries.</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-out_data_dirs"></a>out_data_dirs</td><td align="left">Optional names of additional directories created by the build that should be declared as bazel action outputs</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-out_headers_only"></a>out_headers_only</td><td align="left">Flag variable to indicate that the library produces only headers</td><td align="left">Boolean</td><td align="left">optional</td><td align="left">False</td></tr>
<tr><td align="left"><a id="cmake-out_include_dir"></a>out_include_dir</td><td align="left">Optional name of the output subdirectory with the header files, defaults to 'include'.</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;include&quot;</td></tr>
<tr><td align="left"><a id="cmake-out_interface_libs"></a>out_interface_libs</td><td align="left">Optional names of the resulting interface libraries.</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-out_lib_dir"></a>out_lib_dir</td><td align="left">Optional name of the output subdirectory with the library files, defaults to 'lib'.</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;lib&quot;</td></tr>
<tr><td align="left"><a id="cmake-out_shared_libs"></a>out_shared_libs</td><td align="left">Optional names of the resulting shared libraries.</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-out_static_libs"></a>out_static_libs</td><td align="left">Optional names of the resulting static libraries. Note that if <code>out_headers_only</code>, <code>out_static_libs</code>, <code>out_shared_libs</code>, and <code>out_binaries</code> are not set, default <code>lib_name.a</code>/<code>lib_name.lib</code> static library is assumed</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-postfix_script"></a>postfix_script</td><td align="left">Optional part of the shell script to be added after the make commands</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;&quot;</td></tr>
<tr><td align="left"><a id="cmake-targets"></a>targets</td><td align="left">A list of targets with in the foreign build system to produce. An empty string (<code>&quot;&quot;</code>) will result in a call to the underlying build system with no explicit target set</td><td align="left">List of strings</td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-tool_prefix"></a>tool_prefix</td><td align="left">A prefix for build commands</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;&quot;</td></tr>
<tr><td align="left"><a id="cmake-tools_deps"></a>tools_deps</td><td align="left"><strong>deprecated</strong>: Please use the <code>build_data</code> attribute.</td><td align="left"><a href="https://bazel.build/docs/build-ref.html#labels">List of labels</a></td><td align="left">optional</td><td align="left">[]</td></tr>
<tr><td align="left"><a id="cmake-working_directory"></a>working_directory</td><td align="left">Working directory, with the main CMakeLists.txt (otherwise, the top directory of the lib_source label files is used.)</td><td align="left">String</td><td align="left">optional</td><td align="left">&quot;&quot;</td></tr>
</tbody></table>
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