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[wwwdocs] Document null 'this' dereference issue in /gcc-6/porting_to.html

Message ID 20160211103954.GN8441@redhat.com
State New
Headers show

Commit Message

Jonathan Wakely Feb. 11, 2016, 10:39 a.m. UTC 
On 09/02/16 21:06 +0000, Jonathan Wakely wrote:
>This adds a note to the porting document about the (shockingly
>widespread) problem of calling member functions through null pointers,
>which GCC 6 no longer tolerates.
>
>Following some comments about (bool)os I'm also tweaking another part
>of the doc to use the plusplusgood static_cast form.
>
>Committed to CVS.

Tweak to conform to our spelling conventions.

Committed to CVS.
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Patch

Index: htdocs/gcc-6/porting_to.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v
retrieving revision 1.9
diff -u -r1.9 porting_to.html
--- htdocs/gcc-6/porting_to.html	10 Feb 2016 17:21:54 -0000	1.9
+++ htdocs/gcc-6/porting_to.html	11 Feb 2016 10:34:43 -0000
@@ -248,13 +248,13 @@ 
 null, which is guaranteed by the language rules. Invalid programs which 
 assume it is OK to invoke a member function through a null pointer (possibly
 relying on checks like <code>this != NULL</code>) may crash or otherwise fail
-at run-time if null pointer checks are optimized away.
+at run time if null pointer checks are optimized away.
 With the <code>-Wnull-dereference</code> option the compiler tries to warn
 when it detects such invalid code.
 </p>
 
 <p>
-If the program cannot be fixed to remove the undefined behaviour then the
+If the program cannot be fixed to remove the undefined behavior then the
 option <code>-fno-delete-null-pointer-checks</code> can be used to disable
 this optimization. That option also disables other optimizations involving
 pointers, not only those involving <code>this</code>.