CalculiX is using libstdc++ (this installation is configured to use libc++)

[Chris Jones]

Latest clang compilers probably default to a 'recent' c standard, unless 
otherwise told. If the code in question only builds using the less 
restrictive older standards, then the builds should specify this using 
-std=c89 for instance..

( Note the c99 is that new, its over 20 years old now... If the code in 
question *really* cannot build using that standard, it doesn't say much 
for how well its been maintained. )

On 27/07/2022 1:14 pm, Mark Brethen wrote:
> log for gcc build: https://pastebin.com/qbmWHm1M 
> <https://pastebin.com/qbmWHm1M>
> 
> log for clang12 build: https://pastebin.com/4WG7VsfA 
> <https://pastebin.com/4WG7VsfA>
> 
> clang14 is more restrictive on C implementation:
> 
> :info:build /usr/bin/clang -O2 -Wall -Wno-narrowing -I./ 
> -I/opt/local/include -I/opt/local/include/GL -I../../libSNL/src 
> -I../../glut-3.5/src    -c -o parser.o parser.c
> :info:build parser.c:85:5: error: implicit declaration of function 
> 'DrawCommandLine' is invalid in C99 
> [-Werror,-Wimplicit-function-declaration]
> :info:build     DrawCommandLine(keystroke, strlen(keystroke)+*curshft);
> :info:build     ^
> :info:build 1 error generated.
> :info:build make: *** [parser.o] Error 1
> 
> Mark Brethen
> mark.brethen at gmail.com <mailto:mark.brethen at gmail.com>
> 
> 
> 
>> On Jul 27, 2022, at 3:49 AM, Chris Jones <jonesc at hep.phy.cam.ac.uk 
>> <mailto:jonesc at hep.phy.cam.ac.uk>> wrote:
>>
>>
>> Please post a complete, clean, build log for the port in question.
>>
>> In general GCC should not be used to build c++ (*) as doing so leads 
>> to these c++ runtime mis-matches. You should use clang for c++ (and c 
>> as well, although there is no runtime issues there).
>>
>> cheers Chris
>>
>> * The latest GCC versions now actually support building against 
>> libc++, the clang runtime, which would make this possible in theory. 
>> It needs support in base though 
>> (https://github.com/macports/macports-base/pull/275 
>> <https://github.com/macports/macports-base/pull/275>) so cannot be 
>> used until that is available.
>>
>> On 27/07/2022 1:15 am, Mark Brethen wrote:
>>> Installing CalculiX with a clang variant is successful, however when 
>>> selecting a gcc variant:
>>> --->  Scanning binaries for linking errors
>>> --->  No broken files found.
>>> CalculiX is using libstdc++ (this installation is configured to use 
>>> libc++)
>>> --->  Found 1 broken port, determining rebuild order
>>> You can always run 'port rev-upgrade' again to fix errors.
>>> The following ports will be rebuilt: CalculiX @2.18+docs+examples+gcc12
>>> Continue? [Y/n]:
>>> Choosing ‘Y’ puts it into and endless re-install. Adding 
>>> 'configure.cxx_stdlib macports-libstdc++’ seems to fix things.
>>> 1. What is causing this?
>>> 2. Should the compilers group be removed and stick with clang?
>>> 3. What changes to the portfile would need to made to permit either 
>>> compiler variant?
>>> Thanks,
>>> Mark
>