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<h3 class="section">4.15 Architecture</h3>
<ul>
<li><cite>The values or expressions assigned to the macros specified in the
headers </cite><code><float.h></code><cite>, </cite><code><limits.h></code><cite>, and </cite><code><stdint.h></code><cite>
(C90, C99 and C11 5.2.4.2, C99 7.18.2, C99 7.18.3, C11 7.20.2, C11 7.20.3).</cite>
<p>Determined by ABI.
<li><cite>The result of attempting to indirectly access an object with
automatic or thread storage duration from a thread other than the one
with which it is associated (C11 6.2.4).</cite>
<p>Such accesses are supported, subject to the same requirements for
synchronization for concurrent accesses as for concurrent accesses to
any object.
<li><cite>The number, order, and encoding of bytes in any object
(when not explicitly specified in this International Standard) (C99
and C11 6.2.6.1).</cite>
<p>Determined by ABI.
<li><cite>Whether any extended alignments are supported and the contexts
in which they are supported (C11 6.2.8).</cite>
<p>Extended alignments up to 2^28 (bytes) are supported for
objects of automatic storage duration. Alignments supported for
objects of static and thread storage duration are determined by the
ABI.
<li><cite>Valid alignment values other than those returned by an _Alignof
expression for fundamental types, if any (C11 6.2.8).</cite>
<p>Valid alignments are powers of 2 up to and including 2^28.
<li><cite>The value of the result of the </cite><code>sizeof</code><cite> and </cite><code>_Alignof</code><cite>
operators (C90 6.3.3.4, C99 and C11 6.5.3.4).</cite>
<p>Determined by ABI.
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