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Add _Static_assert docs to cc65 extensions

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Fixes #1149.
This commit is contained in:
Jesse Rosenstock 2020-08-15 21:22:31 +02:00 committed by Oliver Schmidt
parent 1cf9404c19
commit 7e61b11f23
1 changed files with 15 additions and 0 deletions
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15
doc/cc65.sgml
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@ -792,6 +792,21 @@ This cc65 version has some extensions to the ISO C standard.
size zero, even if it is initialized.
<p>
<item> cc65 supports <tt/_Static_assert/ from C11 and C2X. This is similar
to <tt/#error/ but happens at a later stage of translation, so types
can be used.
<tscreen><verb>
/* C11 version with message. */
_Static_assert (sizeof (int) == 2, "Expected 2-bytes ints.");
/* C2X version without message. */
_Static_assert (sizeof (int) == 2);
</verb></tscreen>
<tt/_Static_assert/ is also available as the macro <tt/static_assert/ in
<tt/assert.h/.
<item> Computed gotos, a GCC extension, has limited support. With it you can
use fast jump tables from C. You can take the address of a label with
a double ampersand, putting them in a static const array of type void *.