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* gcc-wwwdocs branch master updated. 9b8a31d640d1c508be86637b6d82fcabf4d31590
@ 2023-03-19 7:46 Thomas Kテカnig
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From: Thomas Kï¾ï½¶nig @ 2023-03-19 7:46 UTC (permalink / raw)
To: gcc-cvs-wwwdocs
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- Log -----------------------------------------------------------------
commit 9b8a31d640d1c508be86637b6d82fcabf4d31590
Author: Thomas Koenig <tkoenig@gcc.gnu.org>
Date: Sun Mar 19 08:43:15 2023 +0100
Fix "doesn't"; add chapter on integer overflow for Fortran.
Removed stuff.
diff --git a/htdocs/gcc-13/porting_to.html b/htdocs/gcc-13/porting_to.html
index 0ee58802..db0bf2fa 100644
--- a/htdocs/gcc-13/porting_to.html
+++ b/htdocs/gcc-13/porting_to.html
@@ -203,11 +203,27 @@ class Alloc
<p>
Since C++20, there is no <code>rebind</code> member in
<code>std::allocator</code>, so deriving your own allocator types from
-<code>std::allocator</code> is simpler and doesn't require the derived
+<code>std::allocator</code> is simpler and does not require the derived
allocator to provide its own <code>rebind</code>.
For compatibility with previous C++ standards, the member should still be
provided. The converting constructor is still required even in C++20.
</p>
+<h2 id="fortran">Fortran language issues</h2>
+<h3 id="overflow">Behavior on integer overflow</h3>
+<p>
+GCC 13 includes new optimizations which may change behavior on
+integer overflow. Traditional code, like linear congruential
+pseudo-random number generators in old programs and relying on a
+specific, non-standard behavior may now generate unexpected results.
+The option <code>-fsanitize=undefined</code> can be used to detect
+such code at runtime.
+</p>
+<p>
+It is recommended to use the intrinsic subroutine
+<code>RANDOM_NUMBER</code> for random number generators
+or, if the old behavior is desired, to use the <code>-fwrapv</code>
+option. Note that this option can impact performance.
+</p>
</body>
</html>
-----------------------------------------------------------------------
Summary of changes:
htdocs/gcc-13/porting_to.html | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
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