Add release notes for new C2X features in GCC 10
Joseph Myers
joseph@codesourcery.com
Wed Nov 20 02:13:00 GMT 2019
I've committed this patch to add release notes for new C2X features in GCC
10.
diff --git a/htdocs/gcc-10/changes.html b/htdocs/gcc-10/changes.html
index 1e9c3f8d..52eb303c 100644
--- a/htdocs/gcc-10/changes.html
+++ b/htdocs/gcc-10/changes.html
@@ -63,6 +63,44 @@ a work-in-progress.</p>
<!-- <h3 id="c-family">C family</h3> -->
+<h3 id="c">C</h3>
+<ul>
+ <li>Several new features from the upcoming C2X revision of the ISO C
+ standard are supported with <code>-std=c2x</code>
+ and <code>-std=gnu2x</code>. Some of these features are also
+ supported as extensions when compiling for older language versions.
+ In addition to the features listed, some features previously
+ supported as extensions and now added to the C standard are enabled
+ by default in C2X mode and not diagnosed with <code>-std=c2x
+ -Wpedantic</code>.
+ <ul>
+ <li>The <code>[[]]</code> attribute syntax is supported, as in
+ C++. Existing attributes can be used with this syntax in forms
+ such as <code>[[gnu::const]]</code>. The standard
+ attributes <code>[[deprecated]]</code>, <code>[[fallthrough]]</code>
+ and <code>[[maybe_unused]]</code> are supported.</li>
+ <li>UTF-8 character constants using the <code>u8''</code> syntax
+ are supported.</li>
+ <li><code><float.h></code> defines
+ macros <code>FLT_NORM_MAX</code>, <code>DBL_NORM_MAX</code>
+ and <code>LDBL_NORM_MAX</code>.</li>
+ <li>When decimal floating-point arithmetic is
+ supported, <code><float.h></code> defines
+ macros <code>DEC32_TRUE_MIN</code>, <code>DEC64_TRUE_MIN</code>
+ and <code>DEC128_TRUE_MIN</code>, in addition to the macros that
+ were previously only defined if <code>__STDC_WANT_DEC_FP__</code>
+ was defined before including <code><float.h></code>.</li>
+ <li>In C2X mode, empty parentheses in a function definition give
+ that function a type with a prototype for subsequent calls; other
+ old-style function definitions are diagnosed by default in C2X
+ mode.</li>
+ <li>The <code>strftime</code> format checking supports
+ the <code>%OB</code> and <code>%Ob</code> formats.</li>
+ <li>In C2X mode, <code>-fno-fp-int-builtin-inexact</code> is
+ enabled by default.</li>
+ </ul></li>
+</ul>
+
<h3 id="cxx">C++</h3>
<ul>
<li>Several C++20 features have been implemented:
--
Joseph S. Myers
joseph@codesourcery.com
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