[Debian-med-packaging] Bug#925745: Bug#925745: [Help] libgtextutils: ftbfs with GCC-9

[Olivier Sallou]

On 8/20/19 3:41 PM, Andreas Tille wrote:
> Hi Olivier,
>
> I'm just forwarding this to Debian Mentors list to get a wider audience.
> I'd prefer a fix over simply removing the test ...


commenting in text_line_reader.h:

            // operator const std::string& () const { return
line_string() ; }

do the job and test pass


but I would prefer a c++ friend to acknowledge this.... It works but I
do not if there are side effects....


Olivier


>
> Thanks for your analysis anyway
>
>      Andreas.
>
> On Tue, Aug 20, 2019 at 03:36:48PM +0200, Olivier Sallou wrote:
>> On 8/20/19 1:24 PM, Andreas Tille wrote:
>>> Control: tags -1 help
>>>
>>> Hi,
>>>
>>> any hint how to deal with
>>
>> this is a test file. In test, there is explicit conversion to string:
>>
>> line = reader.line_string() ; //first line - with explicit method to get
>> the string
>>
>> which works fine as expected
>>
>> In gcc 9 bug, it is implicit conversion that fails. Seems due some c++
>> 11 updates on operators, but I am not an expert on this kind of stuff.
>>
>> As this is only a test, and there is a way to get the result as a string
>> (as first test above test with explicit method), I wonder if we could
>> not simply patch to remove those lines:
>>
>>
>>         line = reader ; //second line - with implicit conversion to
>> std::string
>>         ASSERT( line == "second line" ) ;
>>
>> Further test may also complain (using implicit too):
>>
>>         istream &is2 ( reader ) ; // fourth line - with implicit
>> conversion to std::istream
>>
>>
>> However, as it is a library, implicit conversion may fail on other tools
>> linking with this lib.... Best of course would be to get a fix for this
>> assignement operator
>>
>> Olivier
>>
>>>
>>> ...
>>> g++ -DHAVE_CONFIG_H -I. -I..  -I../src -Wdate-time -D_FORTIFY_SOURCE=2  -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wextra -Wformat-nonliteral -Wformat-security -Wswitch-default -Wswitch-enum -Wunused-parameter -Wfloat-equal -Werror -DDEBUG -g -O1 -DDEBUG -g -O1 -c -o test_text_reader.o test_text_reader.cpp
>>> test_text_reader.cpp: In function 'int main()':
>>> test_text_reader.cpp:48:9: error: ambiguous overload for 'operator=' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'TextLineReader')
>>>    48 |  line = reader ; //second line - with implicit conversion to std::string
>>>       |         ^~~~~~
>>> In file included from /usr/include/c++/9/string:55,
>>>                  from /usr/include/c++/9/bits/locale_classes.h:40,
>>>                  from /usr/include/c++/9/bits/ios_base.h:41,
>>>                  from /usr/include/c++/9/ios:42,
>>>                  from /usr/include/c++/9/ostream:38,
>>>                  from /usr/include/c++/9/iostream:39,
>>>                  from test_text_reader.cpp:19:
>>> /usr/include/c++/9/bits/basic_string.h:665:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
>>>   665 |       operator=(const basic_string& __str)
>>>       |       ^~~~~~~~
>>> /usr/include/c++/9/bits/basic_string.h:732:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
>>>   732 |       operator=(basic_string&& __str)
>>>       |       ^~~~~~~~
>>> make[3]: *** [Makefile:781: test_text_reader.o] Error 1
>>>
>>>
>>> Kind regards
>>>
>>>       Andreas.
>>>
>>>
>> -- 
>> Olivier Sallou
>> Univ Rennes, Inria, CNRS, IRISA
>> Irisa, Campus de Beaulieu
>> F-35042 RENNES - FRANCE
>> Tel: 02.99.84.71.95
>>
>> gpg key id: 4096R/326D8438  (keyring.debian.org)
>> Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438
>>
>>
>>
-- 
Olivier Sallou
Univ Rennes, Inria, CNRS, IRISA
Irisa, Campus de Beaulieu
F-35042 RENNES - FRANCE
Tel: 02.99.84.71.95

gpg key id: 4096R/326D8438  (keyring.debian.org)
Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438