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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> <b46cefcb-144b-50f8-1f79-d2879b4e4c25 AT SystematicSw DOT ab DOT ca> <016d01d5b5b5$47d6b8a0$d78429e0$@samsung.com>
From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date:	Wed, 18 Dec 2019 10:46:57 -0700
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On 2019-12-18 08:10, Pavel Fedin wrote:
> Well, it turned out more complicated than i thought. Here is the reduced
> reproducer:
> --- cut catch_test.cpp ---
> #include <stdexcept>
> #include <iostream>
> #include <vector>
> #include <string>
> #include <fstream>
> 
> void from_file(const std::string &filepath, std::vector<int8_t> &data);
> 
> int main()
> {
>     try
>     {
>       std::vector<int8_t> data;
> 
>       from_file("no_such_file.bin", data);
>       std::cout << "Success ???" << std::endl;
>     }
>     catch (const std::exception &e)
>     {
>       std::cout << "std::exception: " << e.what() << std::endl;
>     }
> 
>     return 0;
> }
> --- cut catch_test.cpp ---
> --- cut catch_test_2.cpp ---
> #include <stdexcept>
> #include <iostream>
> #include <vector>
> #include <string>
> #include <fstream>
> 
> using namespace std;
> 
> template <typename T> void from_file_impl(const string &filepath, vector<T> &data)
> {
> //  data.clear();
> 
>   std::ifstream ifs(filepath.c_str());
>   if (ifs.rdstate() & ifstream::failbit)
>   {
>     throw std::runtime_error("Error in reading " + filepath);
>   }
> 
> /*  T buffer;
> 
>   while (ifs.read(reinterpret_cast<char *>(&buffer), sizeof(T)))
>   {
>     data.push_back(buffer);
>   }*/
> }
> 
> void from_file(const string &filepath, vector<int8_t> &data) { from_file_impl(filepath, data); }
> --- cut catch_test_2.cpp ---
> --- cut console log ---
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ clang++-8 catch_test.cpp catch_test_2.cpp -g -o catch_test
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ ./catch_test
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ g++.exe catch_test.cpp catch_test_2.cpp -g -o catch_test
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ ./catch_test
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ clang++-5.0 catch_test.cpp catch_test_2.cpp -g -o catch_test
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $ ./catch_test
> std::exception: Error in reading no_such_file.bin
> 
> CORP+p DOT fedin AT P-FEDIN01 /cygdrive/d/Projects/Test
> $
> --- cut console log ---
> 
> So, the problem actually reproduces with both clang 8 and gcc (7.4.0 on my 
> system). clang 5 works fine.

Confirmed with clang++ 8, but WJFFM with g++ 7.4.0 and reports exception (below).

Warnings from clang++ and g++:
$ clang++-8/5.0 -g -Og -Wpedantic -Wall -Wextra -o try-catch-stc-1{,.cpp}
try-catch-stc-2.cpp
try-catch-stc-2.cpp:9:78: warning: unused parameter 'data' [-Wunused-parameter]
template <typename T> void from_file_impl(const string &filepath, vector<T> &data)
                                                                             ^
1 warning generated.
$ g++ -g -Og -Wpedantic -Wall -Wextra -o try-catch-stc-1{,.cpp} try-catch-stc-2.cpp
try-catch-stc-2.cpp: In instantiation of ‘void from_file_impl(const string&,
std::vector<T>&) [with T = signed char; std::string = std::basic_string<char>]’:
try-catch-stc-2.cpp:19:34:   required from here
try-catch-stc-2.cpp:9:78: warning: unused parameter ‘data’ [-Wunused-parameter]
 template <typename T> void from_file_impl(const string &filepath, vector<T> &data)
 $ ./try-catch-stc-1
exception: Error in reading no_such_file.bin

>  So, a Windows exception is reported, then the whole thing silently quits.
> I have an impression that it has to do with the bug I previously reported 
> (and someone here claimed he could reproduce it)

Please provide a link to the Cygwin ML message; is it this, confirmed by Takashi
Yano:

	https://cygwin.com/ml/cygwin/2019-10/msg00038.html

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

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