| Message ID | 56BCFA77.9090300@gmail.com |
|---|---|
| State | New |
| Headers | show |
On Thu, Feb 11, 2016 at 02:17:43PM -0700, Martin Sebor wrote: > >>Actually, there is one other thing that might be wort mentioning > >>about flexible array members. > >> > >>The type and mangling of flexible array members has changed. While > >>in GCC 5 and prior the type of a flexible array member is an array > >>of zero elements (a GCC extension), in 6 it is that of an array of > >>an unspecified bound (i.e., T[] as opposed to T[0]). This is > >>a silent ABI change with no -fabi-version/-Wabi option. > > > >Aha. I think you're better-suited to document this than I am. > > Sure. Here's the added text. Please let me know if it's good to > check in. > > Martin > > > Index: htdocs/gcc-6/porting_to.html > =================================================================== > RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v > retrieving revision 1.12 > diff -u -r1.12 porting_to.html > --- htdocs/gcc-6/porting_to.html 11 Feb 2016 18:56:15 -0000 1.12 > +++ htdocs/gcc-6/porting_to.html 11 Feb 2016 21:15:30 -0000 > @@ -315,6 +315,15 @@ > }; > </code></pre> > > +<p> > +Finally, the type and mangling of flexible array members has changed > +from previous releases. While in GCC 5 and prior the type of a flexible > +array member is an array of zero elements (a GCC extension), in GCC 6 it > +is that of an array of an unspecified bound (i.e., <tt>T[]</tt> as opposed > +to <tt>T[0]</tt>). This is a silent ABI change with no corresponding > +<tt>-fabi-version</tt> or <tt>-Wabi</tt> option to disable or warn about. > +</p> > + This seems ok to me, thanks. Marek
Index: htdocs/gcc-6/porting_to.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v retrieving revision 1.12 diff -u -r1.12 porting_to.html --- htdocs/gcc-6/porting_to.html 11 Feb 2016 18:56:15 -0000 1.12 +++ htdocs/gcc-6/porting_to.html 11 Feb 2016 21:15:30 -0000 @@ -315,6 +315,15 @@ }; </code></pre> +<p> +Finally, the type and mangling of flexible array members has changed +from previous releases. While in GCC 5 and prior the type of a flexible +array member is an array of zero elements (a GCC extension), in GCC 6 it +is that of an array of an unspecified bound (i.e., <tt>T[]</tt> as opposed +to <tt>T[0]</tt>). This is a silent ABI change with no corresponding +<tt>-fabi-version</tt> or <tt>-Wabi</tt> option to disable or warn about. +</p> + <h2>-Wmisleading-indentation</h2> <p> A new warning <code>-Wmisleading-indentation</code> was added