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doc: update gccgo docs
Update docs on correspondence between Go releases and GCC releases. Update C type that corresponds to Go type `int`. Drop out of date comments about Ubuntu and RTEMS. Change-Id: Ic1b5ce9f242789af23ec3b7e7a64c9d257d6913e Reviewed-on: https://go-review.googlesource.com/35631 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -52,6 +52,19 @@ user libraries. The Go 1.4 runtime is not fully merged, but that
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should not be visible to Go programs.
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</p>
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<p>
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The GCC 6 releases include a complete implementation of the Go 1.6.1
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user libraries. The Go 1.6 runtime is not fully merged, but that
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should not be visible to Go programs.
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</p>
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<p>
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The GCC 7 releases are expected to include a complete implementation
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of the Go 1.8 user libraries. As with earlier releases, the Go 1.8
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runtime is not fully merged, but that should not be visible to Go
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programs.
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</p>
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<h2 id="Source_code">Source code</h2>
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<p>
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@ -160,23 +173,6 @@ make
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make install
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</pre>
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<h3 id="Ubuntu">A note on Ubuntu</h3>
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<p>
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Current versions of Ubuntu and versions of GCC before 4.8 disagree on
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where system libraries and header files are found. This is not a
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gccgo issue. When building older versions of GCC, setting these
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environment variables while configuring and building gccgo may fix the
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problem.
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</p>
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<pre>
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LIBRARY_PATH=/usr/lib/x86_64-linux-gnu
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C_INCLUDE_PATH=/usr/include/x86_64-linux-gnu
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CPLUS_INCLUDE_PATH=/usr/include/x86_64-linux-gnu
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export LIBRARY_PATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH
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</pre>
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<h2 id="Using_gccgo">Using gccgo</h2>
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<p>
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@ -364,12 +360,15 @@ or with C++ code compiled using <code>extern "C"</code>.
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<h3 id="Types">Types</h3>
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<p>
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Basic types map directly: an <code>int</code> in Go is an <code>int</code>
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in C, an <code>int32</code> is an <code>int32_t</code>,
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etc. Go <code>byte</code> is equivalent to C <code>unsigned
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char</code>.
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Pointers in Go are pointers in C. A Go <code>struct</code> is the same as C
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<code>struct</code> with the same fields and types.
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Basic types map directly: an <code>int32</code> in Go is
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an <code>int32_t</code> in C, an <code>int64</code> is
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an <code>int64_t</code>, etc.
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The Go type <code>int</code> is an integer that is the same size as a
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pointer, and as such corresponds to the C type <code>intptr_t</code>.
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Go <code>byte</code> is equivalent to C <code>unsigned char</code>.
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Pointers in Go are pointers in C.
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A Go <code>struct</code> is the same as C <code>struct</code> with the
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same fields and types.
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</p>
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<p>
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@ -380,7 +379,7 @@ structure (this is <b style="color: red;">subject to change</b>):
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<pre>
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struct __go_string {
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const unsigned char *__data;
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int __length;
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intptr_t __length;
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};
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</pre>
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@ -400,8 +399,8 @@ A slice in Go is a structure. The current definition is
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<pre>
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struct __go_slice {
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void *__values;
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int __count;
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int __capacity;
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intptr_t __count;
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intptr_t __capacity;
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};
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</pre>
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@ -526,15 +525,3 @@ This procedure is full of unstated caveats and restrictions and we make no
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guarantee that it will not change in the future. It is more useful as a
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starting point for real Go code than as a regular procedure.
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</p>
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<h2 id="RTEMS_Port">RTEMS Port</h2>
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<p>
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The gccgo compiler has been ported to <a href="http://www.rtems.com/">
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<code>RTEMS</code></a>. <code>RTEMS</code> is a real-time executive
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that provides a high performance environment for embedded applications
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on a range of processors and embedded hardware. The current gccgo
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port is for x86. The goal is to extend the port to most of the
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<a href="http://www.rtems.org/wiki/index.php/SupportedCPUs">
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architectures supported by <code>RTEMS</code></a>. For more information on the port,
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as well as instructions on how to install it, please see this
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<a href="http://www.rtems.org/wiki/index.php/GCCGoRTEMS"><code>RTEMS</code> Wiki page</a>.
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