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<div class="moz-cite-prefix">On 03/22/2017 06:17 PM, Hubert Tong via
cfe-dev wrote:<br>
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<div>-fno-exceptions causes EH constructs such as try/catch,
function-try-blocks, and throw expressions to be diagnosed
with a severe error. That is, -f[no-]exceptions controls a
language-support property.<br>
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For experiments in evaluating the cost of (unused) exception
handling, and for cases where components are being deployed
with the expectation that exceptions will not be thrown, etc.
it is useful to allow EH constructs in the source, but to
generate code with no handlers or cleanups.<br>
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<div>I think that it still makes sense under such a mode to
allow throw expressions to throw. This is consistent with
-fno-exceptions still calling __cxa_bad_cast and
__cxa_bad_typeid (which GCC also does, but not with
__cxa_throw_bad_array_new_length).<br>
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<div>That is, the proposed semantics is essentially the same as
for -fno-exceptions, except to treat try/catch and
function-try-blocks as just normal code introducing no
handlers, and to allow throw expressions.<br>
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<div>-fno-exceptions already suppresses creation of cleanups for
unwinding and the ignoring of exception specifications.<br>
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<div>I like to think of this as -fignore-exceptions. I have a
use for this, and I would like to know what people think.<br>
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To summarize, code compiled with -fignore-exceptions can throw, but
can't catch anything. All exceptions just unwind through all such
code. Is that right?<br>
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-Hal<br>
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<div>-- HT<br>
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<pre class="moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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