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doc: update gccgo docs for move of gofrontend to git
This also includes some other minor updates to the documentation. Change-Id: Iafab353727d7622d125b97fbdeaa81525b7a92aa Reviewed-on: https://go-review.googlesource.com/11123 Reviewed-by: Yves Junqueira <yves.junqueira@gmail.com> Reviewed-by: Russ Cox <rsc@golang.org>
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@ -30,7 +30,9 @@ contribution rules</a>.
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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="//code.google.com/p/gofrontend">http://code.google.com/p/gofrontend</a>.
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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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@ -53,14 +55,12 @@ them.
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</p>
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<p>
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The gccgo frontend is written in C++. It follows the GNU coding
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standards to the extent that they apply to C++. In writing code for
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the frontend, follow the formatting of the surrounding code. Although
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the frontend is currently tied to the rest of the GCC codebase, we
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plan to make it more independent. Eventually all GCC-specific code
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will migrate out of the frontend proper and into GCC proper. In the
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GCC sources this will generally mean moving code
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from <code>gcc/go/gofrontend</code> to <code>gcc/go</code>.
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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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@ -46,6 +46,12 @@ identical to Go 1.1. The GCC 4.8.2 release includes a complete Go
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The GCC 4.9 releases include a complete Go 1.2 implementation.
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</p>
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<p>
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The GCC 5 releases include a complete implementation of the Go 1.4
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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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<h2 id="Source_code">Source code</h2>
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<p>
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@ -174,13 +180,10 @@ export LIBRARY_PATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH
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<h2 id="Using_gccgo">Using gccgo</h2>
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<p>
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The gccgo compiler works like other gcc frontends. The gccgo
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installation does not currently include a version of
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the <code>go</code> command. However if you have the <code>go</code>
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command from an installation of the <code>gc</code> compiler, you can
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use it with gccgo by passing the option <code>-compiler gccgo</code>
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to <code>go build</code> or <code>go install</code> or <code>go
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test</code>.
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The gccgo compiler works like other gcc frontends. As of GCC 5 the gccgo
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installation also includes a version of the <code>go</code> command,
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which may be used to build Go programs as described at
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<a href="http://golang.org/cmd/go">http://golang.org/cmd/go</a>.
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</p>
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<p>
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@ -232,13 +235,14 @@ name the directory where <code>libgo.so</code> is found.
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<li>
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<p>
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Passing a <code>-Wl,-R</code> option when you link:
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Passing a <code>-Wl,-R</code> option when you link (replace lib with
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lib64 if appropriate for your system):
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</p>
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<pre>
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gccgo -o file file.o -Wl,-R,${prefix}/lib/gcc/MACHINE/VERSION
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go build -gccgoflags -Wl,-R,${prefix}/lib/gcc/MACHINE/VERSION
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[or]
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gccgo -o file file.o -Wl,-R,${prefix}/lib64/gcc/MACHINE/VERSION
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gccgo -o file file.o -Wl,-R,${prefix}/lib/gcc/MACHINE/VERSION
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</pre>
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</li>
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@ -266,27 +270,33 @@ and <code>-g</code> options.
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</p>
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<p>
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The <code>-fgo-prefix=PREFIX</code> option may be used to set a unique
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prefix for the package being compiled. This option is intended for
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use with large programs that contain many packages, in order to allow
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multiple packages to use the same identifier as the package name.
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The <code>PREFIX</code> may be any string; a good choice for the
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string is the directory where the package will be installed.
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The <code>-fgo-pkgpath=PKGPATH</code> option may be used to set a
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unique prefix for the package being compiled.
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This option is automatically used by the go command, but you may want
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to use it if you invoke gccgo directly.
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This option is intended for use with large
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programs that contain many packages, in order to allow multiple
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packages to use the same identifier as the package name.
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The <code>PKGPATH</code> may be any string; a good choice for the
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string is the path used to import the package.
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</p>
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<p>
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The <code>-I</code> and <code>-L</code> options, which are synonyms
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for the compiler, may be used to set the search path for finding
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imports.
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These options are not needed if you build with the go command.
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</p>
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<h2 id="Imports">Imports</h2>
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<p>
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When you compile a file that exports something, the export
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information will be stored directly in the object file. When
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you import a package, you must tell gccgo how to
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find the file.
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information will be stored directly in the object file.
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If you build with gccgo directly, rather than with the go command,
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then when you import a package, you must tell gccgo how to find the
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file.
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</p>
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<p>
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When you import the package <var>FILE</var> with gccgo,
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@ -319,9 +329,10 @@ gccgo. Both options take directories to search. The
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</p>
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<p>
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The gccgo compiler does not currently (2013-06-20) record
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The gccgo compiler does not currently (2015-06-15) record
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the file name of imported packages in the object file. You must
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arrange for the imported data to be linked into the program.
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Again, this is not necessary when building with the go command.
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</p>
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<pre>
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