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author | Russ Cox <rsc@golang.org> | 2014-05-20 13:38:45 -0400 |
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committer | Russ Cox <rsc@golang.org> | 2014-05-20 13:38:45 -0400 |
commit | 7ef0eb1cba873c0d3d1da6df9b6c98ab2882d35d (patch) | |
tree | e1c95164ea23888b1995f4be65953efb86112b83 | |
parent | 0c2a727477908dc0adbfcb05baac34b4ba4fa309 (diff) | |
download | go-7ef0eb1cba873c0d3d1da6df9b6c98ab2882d35d.tar.gz go-7ef0eb1cba873c0d3d1da6df9b6c98ab2882d35d.zip |
doc/go1.3.html: mention cgo [0]byte bug fix fallout
Fixes #7958.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/91590044
-rw-r--r-- | doc/go1.3.html | 73 |
1 files changed, 53 insertions, 20 deletions
diff --git a/doc/go1.3.html b/doc/go1.3.html index db7425ccdb..4c59f212cd 100644 --- a/doc/go1.3.html +++ b/doc/go1.3.html @@ -36,7 +36,8 @@ as of Go 1.3 it is not supported by Go either. <h3 id="dragonfly">Support for DragonFly BSD</h3> <p> -Go 1.3 now includes experimental support for DragonFly BSD on the <code>amd64</code> (64-bit x86) and <code>386</code> (32-bit x86) architectures. It uses DragonFly BSD 3.6 or above. +Go 1.3 now includes experimental support for DragonFly BSD on the <code>amd64</code> (64-bit x86) and <code>386</code> (32-bit x86) architectures. +It uses DragonFly BSD 3.6 or above. </p> <h3 id="freebsd">Support for FreeBSD</h3> @@ -52,8 +53,8 @@ As of Go 1.3, support for Go on FreeBSD requires that the kernel be compiled wit </p> <p> -In concert with the switch to EABI syscalls for ARM platforms, Go 1.3 will run only on -FreeBSD 10. The x86 platforms, 386 and amd64, are unaffected. +In concert with the switch to EABI syscalls for ARM platforms, Go 1.3 will run only on FreeBSD 10. +The x86 platforms, 386 and amd64, are unaffected. </p> <h3 id="nacl">Support for Native Client</h3> @@ -83,13 +84,15 @@ As of Go 1.3, support for Go on OpenBSD requires OpenBSD 5.5 or above. <h3 id="plan9">Support for Plan 9</h3> <p> -Go 1.3 now includes experimental support for Plan 9 on the <code>386</code> (32-bit x86) architecture. It requires the <code>Tsemacquire</code> syscall, which has been in Plan 9 since June, 2012. +Go 1.3 now includes experimental support for Plan 9 on the <code>386</code> (32-bit x86) architecture. +It requires the <code>Tsemacquire</code> syscall, which has been in Plan 9 since June, 2012. </p> <h3 id="solaris">Support for Solaris</h3> <p> -Go 1.3 now includes experimental support for Solaris on the <code>amd64</code> (64-bit x86) architecture. It requires illumos, Solaris 11 or above. +Go 1.3 now includes experimental support for Solaris on the <code>amd64</code> (64-bit x86) architecture. +It requires illumos, Solaris 11 or above. </p> <h2 id="memory">Changes to the memory model</h2> @@ -228,7 +231,8 @@ of the specified target, but not the target itself. <p> Cross compiling with <a href="/cmd/cgo/"><code>cgo</code></a> enabled -is now supported. The CC_FOR_TARGET and CXX_FOR_TARGET environment +is now supported. +The CC_FOR_TARGET and CXX_FOR_TARGET environment variables are used when running all.bash to specify the cross compilers for C and C++ code, respectively. </p> @@ -238,11 +242,36 @@ Finally, the go command now supports packages that import Objective-C files (suffixed <code>.m</code>) through cgo. </p> +<h3 id="cgo">Changes to cgo</h3> + +<p> +The <a href="/cmd/cgo/"><code>cmd/cgo</code></a> command, +which processes <code>import "C"</code> declarations in Go packages, +has corrected a serious bug that may cause some packages to stop compiling. +Previously, all pointers to incomplete struct types translated to the Go type <code>*[0]byte</code>, +with the effect that the Go compiler could not diagnose passing one kind of struct pointer +to a function expecting another. +Go 1.3 corrects this mistake by translating each different +incomplete struct to a different named type. +However, some Go code took advantage of this bug to pass (for example) a <code>*C.FILE</code> +from one package to another. +This is not legal and no longer works: in general Go packages +should avoid exposing C types and names in their APIs. +</p> + +<p> +<em>Updating</em>: Code confusing pointers to incomplete types or +passing them across package boundaries will no longer compile +and must be rewritten. +If the conversion is correct and must be preserved, +use an explicit conversion via <a href="/pkg/unsafe/#Pointer"><code>unsafe.Pointer</code></a>. +</p> + <h3 id="swig">SWIG 3.0 required for programs that use SWIG</h3> <p> -For Go programs that use SWIG, SWIG version 3.0 is now required. The -<a href="/cmd/go"><code>cmd/go</code></a> command will now link the +For Go programs that use SWIG, SWIG version 3.0 is now required. +The <a href="/cmd/go"><code>cmd/go</code></a> command will now link the SWIG generated object files directly into the binary, rather than building and linking with a shared library. </p> @@ -252,8 +281,8 @@ building and linking with a shared library. <p> In the gc tool chain, the assemblers now use the same command-line flag parsing rules as the Go flag package, a departure -from the traditional Unix flag parsing. This may affect scripts that invoke -the tool directly. +from the traditional Unix flag parsing. +This may affect scripts that invoke the tool directly. For example, <code>go tool 6a -SDfoo</code> must now be written <code>go tool 6a -S -D foo</code>. @@ -304,7 +333,8 @@ is now about 40% faster. <li> The regular expression package <a href="/pkg/regexp/"><code>regexp</code></a> is now significantly faster for certain simple expressions due to the implementation of -a second, one-pass execution engine. The choice of which engine to use is automatic; +a second, one-pass execution engine. +The choice of which engine to use is automatic; the details are hidden from the user. </li> @@ -364,7 +394,8 @@ See the relevant package documentation for more information about each change. <li> The complex power function, <a href="/pkg/math/cmplx/#Pow"><code>Pow</code></a>, -now specifies the behavior when the first argument is zero. It was undefined before. +now specifies the behavior when the first argument is zero. +It was undefined before. The details are in the <a href="/pkg/math/cmplx/#Pow">documentation for the function</a>. </li> @@ -406,8 +437,8 @@ The <a href="/pkg/net/http/"><code>net/http</code></a> package now supports disabling HTTP keep-alive connections on the server with <a href="/pkg/net/http/#Server.SetKeepAlivesEnabled"><code>Server.SetKeepAlivesEnabled</code></a>. The default continues to be that the server does keep-alive (reuses -connections for multiple requests) by default. Only -resource-constrained servers or those in the process of graceful +connections for multiple requests) by default. +Only resource-constrained servers or those in the process of graceful shutdown will want to disable them. </li> @@ -415,7 +446,8 @@ shutdown will want to disable them. The <a href="/pkg/net/http/"><code>net/http</code></a> package adds an optional <a href="/pkg/net/http/#Transport"><code>Transport.TLSHandshakeTimeout</code></a> setting to cap the amount of time HTTP client requests will wait for -TLS handshakes to complete. It's now also set by default +TLS handshakes to complete. +It's now also set by default on <a href="/pkg/net/http#DefaultTransport"><code>DefaultTransport</code></a>. </li> @@ -424,8 +456,8 @@ The <a href="/pkg/net/http/"><code>net/http</code></a> package's <a href="/pkg/net/http/#DefaultTransport"><code>DefaultTransport</code></a>, used by the HTTP client code, now enables <a href="http://en.wikipedia.org/wiki/Keepalive#TCP_keepalive">TCP -keep-alives</a> by -default. Other <a href="/pkg/net/http/#Transport"><code>Transport</code></a> +keep-alives</a> by default. +Other <a href="/pkg/net/http/#Transport"><code>Transport</code></a> values with a nil <code>Dial</code> field continue to function the same as before: no TCP keep-alives are used. </li> @@ -437,7 +469,8 @@ keep-alives</a> for incoming server requests when <a href="/pkg/net/http/#ListenAndServe"><code>ListenAndServe</code></a> or <a href="/pkg/net/http/#ListenAndServeTLS"><code>ListenAndServeTLS</code></a> -are used. When a server is started otherwise, TCP keep-alives are not enabled. +are used. +When a server is started otherwise, TCP keep-alives are not enabled. </li> <li> @@ -445,8 +478,8 @@ The <a href="/pkg/net/http/"><code>net/http</code></a> package now provides an optional <a href="/pkg/net/http/#Server"><code>Server.ConnState</code></a> callback to hook various phases of a server connection's lifecycle -(see <a href="/pkg/net/http/#ConnState"><code>ConnState</code></a>). This -can be used to implement rate limiting or graceful shutdown. +(see <a href="/pkg/net/http/#ConnState"><code>ConnState</code></a>). +This can be used to implement rate limiting or graceful shutdown. </li> <li> |