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Change-Id: I63af8f0a19ec91f4a2001aa7a2eadcd2232a47df Reviewed-on: https://go-review.googlesource.com/28348 Reviewed-by: Ian Lance Taylor <iant@golang.org>
112 lines
4.2 KiB
HTML
112 lines
4.2 KiB
HTML
<!--{
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"Title": "Contributing to the gccgo frontend"
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}-->
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<h2>Introduction</h2>
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<p>
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These are some notes on contributing to the gccgo frontend for GCC.
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For information on contributing to parts of Go other than gccgo,
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see <a href="/doc/contribute.html">Contributing to the Go project</a>. For
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information on building gccgo for yourself,
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see <a href="/doc/gccgo_install.html">Setting up and using gccgo</a>.
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For more of the gritty details on the process of doing development
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with the gccgo frontend,
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see <a href="https://go.googlesource.com/gofrontend/+/master/HACKING">the
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file HACKING</a> in the gofrontend repository.
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</p>
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<h2>Legal Prerequisites</h2>
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<p>
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You must follow the <a href="/doc/contribute.html#copyright">Go copyright
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rules</a> for all changes to the gccgo frontend and the associated
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libgo library. Code that is part of GCC rather than gccgo must follow
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the general <a href="http://gcc.gnu.org/contribute.html">GCC
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contribution rules</a>.
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</p>
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<h2>Code</h2>
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<p>
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The master sources for the gccgo frontend may be found at
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<a href="http://go.googlesource.com/gofrontend">http://go.googlesource.com/gofrontend</a>.
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They are mirrored
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at <a href="http://github.com/golang/gofrontend">http://github.com/golang/gofrontend</a>.
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The master sources are not buildable by themselves, but only in
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conjunction with GCC (in the future, other compilers may be
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supported). Changes made to the gccgo frontend are also applied to
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the GCC source code repository hosted at <code>gcc.gnu.org</code>. In
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the <code>gofrontend</code> repository, the <code>go</code> directory
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is mirrored to the <code>gcc/go/gofrontend</code> directory in the GCC
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repository, and the <code>gofrontend</code> <code>libgo</code>
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directory is mirrored to the GCC <code>libgo</code> directory. In
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addition, the <code>test</code> directory
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from <a href="//go.googlesource.com/go">the main Go repository</a>
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is mirrored to the <code>gcc/testsuite/go.test/test</code> directory
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in the GCC repository.
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</p>
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<p>
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Changes to these directories always flow from the master sources to
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the GCC repository. The files should never be changed in the GCC
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repository except by changing them in the master sources and mirroring
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them.
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</p>
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<p>
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The gccgo frontend is written in C++.
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It follows the GNU and GCC coding standards for C++.
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In writing code for the frontend, follow the formatting of the
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surrounding code.
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Almost all GCC-specific code is not in the frontend proper and is
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instead in the GCC sources in the <code>gcc/go</code> directory.
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</p>
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<p>
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The run-time library for gccgo is mostly the same as the library
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in <a href="//go.googlesource.com/go">the main Go repository</a>.
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The library code in the Go repository is periodically merged into
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the <code>libgo/go</code> directory of the <code>gofrontend</code> and
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then the GCC repositories, using the shell
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script <code>libgo/merge.sh</code>. Accordingly, most library changes
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should be made in the main Go repository. The files outside
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of <code>libgo/go</code> are gccgo-specific; that said, some of the
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files in <code>libgo/runtime</code> are based on files
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in <code>src/runtime</code> in the main Go repository.
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</p>
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<h2>Testing</h2>
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<p>
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All patches must be tested. A patch that introduces new failures is
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not acceptable.
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</p>
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<p>
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To run the gccgo test suite, run <code>make check-go</code> in your
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build directory. This will run various tests
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under <code>gcc/testsuite/go.*</code> and will also run
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the <code>libgo</code> testsuite. This copy of the tests from the
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main Go repository is run using the DejaGNU script found
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in <code>gcc/testsuite/go.test/go-test.exp</code>.
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</p>
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<p>
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Most new tests should be submitted to the main Go repository for later
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mirroring into the GCC repository. If there is a need for specific
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tests for gccgo, they should go in
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the <code>gcc/testsuite/go.go-torture</code>
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or <code>gcc/testsuite/go.dg</code> directories in the GCC repository.
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</p>
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<h2>Submitting Changes</h2>
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<p>
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Changes to the Go frontend should follow the same process as for the
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main Go repository, only for the <code>gofrontend</code> project and
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the <code>gofrontend-dev@googlegroups.com</code> mailing list
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rather than the <code>go</code> project and the
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<code>golang-dev@googlegroups.com</code> mailing list. Those changes
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will then be merged into the GCC sources.
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</p>
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