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Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject: Re: [BUG] try..catch does not work if compiled with clang 8.0
To: cygwin AT cygwin DOT com
References: <CGME20191217093504eucas1p14cced4e1f9fcec50e44e9223d1761858 AT eucas1p1 DOT samsung DOT com> <000701d5b4bd$42c086f0$c84194d0$@samsung.com> <af3cb99f-f1cc-3bcc-9644-310c259eb222 AT SystematicSw DOT ab DOT ca> <a9a62b50-688c-5747-266a-e7bb8157adbb AT gmail DOT com>
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date: Tue, 17 Dec 2019 17:05:13 -0700
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On 2019-12-17 13:51, Csaba Ráduly wrote:
> On 17/12/2019 17:29, Brian Inglis wrote:
>> On 2019-12-17 02:35, Pavel Fedin wrote:
>>> I haven't upgraded for a while and today i finally decided to do so. After
>>> rebuilding by project with clang++ 8.0 i found out that try...catch construct
>>> doesn't work. The program just gets silently aborted.
>>> Switched back to old clang++ 5.0 and it works.
>>> Also an old bug which i reported some (a while) time ago persists: uncaught
>>> throw does not print anything.
>>> OS is Windows 10 x86/64.
>> It is unlikely that try/catch does not work in the general case for clang++8,
>> and your post has insufficient information to reproduce the problem.
> 
> a.k.a. https://www.chiark.greenend.org.uk/~sgtatham/bugs.html#respect

Indeed!

> WJFFM
>> $ cat catcher.cpp
> #include <stdexcept>
> #include <iostream>
> 
> int pitcher()
> {
>     throw std::runtime_error{"Ouch"};
> }
> 
> int main()
> {
>     try {
>         return pitcher();
>     }
>     catch (std::exception const&e) {
>         std::cout << "Caught a " << typeid(e).name() << " - " << e.what() << '\n';
>         return 42;
>     }
> }
> 
> $ g++ -v -Wall -Wpedantic -Wextra -g  catcher.cpp

> $ ./a.exe
> Caught a St13runtime_error - Ouch

The report was about clang++ 8 vs 5; tweaked source to build under 5 and 8:
...
#include <typeinfo>

int pitcher()
{
    throw std::runtime_error("Ouch");
}
...

but same WJFFM results:

$ clang++-5.0 -g -Og -Wpedantic -Wall -Wextra -o try-catch-stc{,.cpp}
$ ./try-catch-stc
Caught a St13runtime_error - Ouch

$ clang++-8 -g -Og -Wpedantic -Wall -Wextra -o try-catch-stc{,.cpp}
$ ./try-catch-stc
Caught a St13runtime_error - Ouch

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.

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