On Wed, Sep 29, 2021 at 10:16 AM apinski--- via Gcc-patches <gcc-patches@gcc.gnu.org> wrote: > > From: Andrew Pinski <apin...@marvell.com> > > Even though there is not many computed gotos in the wild and even less > that would use an integer type, it would still be a good idea to add > this new error message to both changes and the porting to guide. > > OK?
OK. Richard. > --- > htdocs/gcc-12/changes.html | 6 ++-- > htdocs/gcc-12/porting_to.html | 66 > +++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 70 insertions(+), 2 deletions(-) > create mode 100644 htdocs/gcc-12/porting_to.html > > diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html > index 1f156a9..3130710 100644 > --- a/htdocs/gcc-12/changes.html > +++ b/htdocs/gcc-12/changes.html > @@ -17,11 +17,9 @@ > <p> > This page is a "brief" summary of some of the huge number of improvements > in GCC 12. > -<!-- > You may also want to check out our > <a href="porting_to.html">Porting to GCC 12</a> page and the > <a href="../onlinedocs/index.html#current">full GCC documentation</a>. > ---> > </p> > > <p>Note: GCC 12 has not been released yet, so this document is > @@ -31,6 +29,10 @@ a work-in-progress.</p> > <h2>Caveats</h2> > <ul> > <li> > + <strong>C:</strong> > + Computed gotos require a pointer type now. > + </li> > + <li> > <strong>C++:</strong> > Two non-standard <code>std::pair</code> constructors have been > deprecated. > These allowed the use of an rvalue and a literal <code>0</code> to > diff --git a/htdocs/gcc-12/porting_to.html b/htdocs/gcc-12/porting_to.html > new file mode 100644 > index 0000000..9154d7b > --- /dev/null > +++ b/htdocs/gcc-12/porting_to.html > @@ -0,0 +1,66 @@ > +<!DOCTYPE html> > +<html lang="en"> > + > +<head> > +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> > +<title>Porting to GCC 12</title> > +<link rel="stylesheet" type="text/css" href="https://gcc.gnu.org/gcc.css"; /> > +</head> > + > +<body> > +<h1>Porting to GCC 12</h1> > + > +<p> > +The GCC 12 release series differs from previous GCC releases in > +<a href="changes.html">a number of ways</a>. Some of these are a result > +of bug fixing, and some old behaviors have been intentionally changed > +to support new standards, or relaxed in standards-conforming ways to > +facilitate compilation or run-time performance. > +</p> > + > +<p> > +Some of these changes are user visible and can cause grief when > +porting to GCC 12. This document is an effort to identify common issues > +and provide solutions. Let us know if you have suggestions for improvements! > +</p> > + > + > +<!-- > +<h2 id="cpp">Preprocessor issues</h2> > +--> > +<h2 id="c">C language issues</h2> > + > +<h3 id="computedgotos">Computed goto now require a pointer type</h3> > + > +<p> > +In GCC 12, computed gotos require a pointer type. > +An example which was accepted before:</p> > +<pre><code> > + void f(void) > + { > + goto *10; > + } > +</code></pre> > +is no longer accepted and you need to add a cast to it like: > + > +<pre><code> > + void f(void) > + { > + goto *(void*)10; > + } > +</code></pre> > + > +<!-- > +<h2 id="cxx">C++ language issues</h2> > +--> > + > +<!-- > +<h2 id="fortran">Fortran language issues</h2> > +--> > + > +<!-- > +<h2 id="links">Links</h2> > +--> > + > +</body> > +</html> > -- > 1.8.3.1 >
