On Fri, Jan 27, 2017 at 05:36:48PM +0100, Jakub Jelinek wrote:
> On Fri, Jan 27, 2017 at 05:13:22PM +0100, Marek Polacek wrote:
> > + <li><code>-Wregister</code> warns about uses of register storage
> > specifier.
> > + </li>
>
> For -Wregister I think it would be better to write more:
> <li><code>-Wregister</code> warns about uses of <code>register</code>
> storage
> specifier. In C++17 this keyword has been removed and for C++17
> this is a pedantic warning enabled by default. The warning is not
> emitted for the GNU Explicit Register Variables extension.</li>
> ?
Sure:
Index: changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-7/changes.html,v
retrieving revision 1.44
diff -u -r1.44 changes.html
--- changes.html 27 Jan 2017 09:54:32 -0000 1.44
+++ changes.html 27 Jan 2017 17:06:40 -0000
@@ -110,6 +110,49 @@
<h3 id="c-family">C family</h3>
<ul>
+<li>New command-line options have been added for the C and C++ compilers:
+ <ul>
+ <li><code>-Wimplicit-fallthrough</code> warns when a switch case falls
+ through. This warning has five different levels. The compiler is
+ able to parse a wide range of falls through comments, depending on
+ the level. It also handles control-flow statements, such as ifs.
+ It's possible to suppres the warning by either adding a falls through
+ comment, or by using a null statement: <code>__attribute__
+ ((fallthrough));</code> (C, C++), or <code>[[fallthrough]];</code>
+ (C++17), or <code>[[gnu::fallthrough]];</code> (C++11/C++14).
+ This warning is enabled by <code>-Wextra</code>.</li>
+ <li><code>-Wpointer-compare</code> warns when a pointer is compared with
+ a zero character constant. This code is now invalid in C++11 and
+ GCC rejects such code. This warning is enabled by default.</li>
+ <li><code>-Wduplicated-branches</code> warns when an if-else has identical
+ branches.</li>
+ <li><code>-Wrestrict</code> warns when an argument passed to a
+ restrict-qualified parameter aliases with another argument.</li>
+ <li><code>-Wmemset-elt-size</code> warns for memset calls, when the first
+ argument references an array, and the third argument is a number equal
+ to the number of elements of the array, but not the size of the array.
+ This warning is enabled by <code>-Wall</code>.</li>
+ <li><code>-Wint-in-bool-context</code> warns about suspicious uses of
+ integer values where boolean values are expected. This warning is
+ enabled by <code>-Wall</code>.</li>
+ <li><code>-Wswitch-unreachable</code> warns when a switch statement has
+ statements between the controlling expression and the first case label
+ which will never be executed. This warning is enabled by default.</li>
+ <li><code>-Wexpansion-to-defined</code> warns when <code>defined</code> is
+ used outside <code>#if</code>. This warning is enabled by
+ <code>-Wextra</code> or <code>-Wpedantic</code>.</li>
+ <li><code>-Wregister</code> warns about uses of <code>register</code>
+ storage specifier. In C++17 this keyword has been removed and for
C++17
+ this is a pedantic warning enabled by default. The warning is not
+ emitted for the GNU Explicit Register Variables extension.</li>
+ <li><code>-Wvla-larger-than=N</code> warns about unbounded uses of
+ variable-length arrays, and about bounded uses of variable-length
+ arrays whose bound can be larger than <code>N</code> bytes.</li>
+ <li><code>-Wduplicate-decl-specifier</code> warns when a declaration
+ has duplicate const, volatile, restrict or _Atomic specifier.
+ This warning is enabled by <code>-Wall</code>.</li>
+ </ul>
+</li>
<li>GCC 6's C and C++ frontends were able to offer suggestions for
misspelled field names:
<blockquote><pre>
@@ -172,6 +215,8 @@
<span class="green">%d</span>
</pre></blockquote></li>
+<li>The new <code>-Wdangling-else</code> command-line option has been split
+out of <code>-Wparentheses</code> and warns about dangling else.</li>
<li><p>The <code>-Wshadow</code> warning has been split into three
variants. <code>-Wshadow=global</code> warns for any shadowing. This
is the default when using <code>-Wshadow</code> without any
@@ -303,6 +348,9 @@
<span class="boldred">^</span>
<span class="green">;</span>
</pre></blockquote></li>
+ <li><code>-Waligned-new</code> has been added to the C++ front end. It warns
+ about <code>new</code> of type with extended alignment without
+ <code>-faligned-new</code>.</li>
</ul>
<h4 id="libstdcxx">Runtime Library (libstdc++)</h4>
Marek
