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Re: g++ and linking

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On 1/21/2022 8:32 PM, Joseph Hesse wrote:
> Hello,
> 
> Suppose we compile two source files to object files with:
> g++ -c -std=c++14 file1.cpp file2.cpp
> 
> Now we link them to an executable.
> g++ -o prog -std=c++14 file1.o file2.o
> 
> Since the above is a linker command, do we need the -std=c++14?

No and yes.

The only conceivable practical reason to do this would be a potential 
situation where different versions of the language standard required 
linking in different versions of standard library binaries.

This is a reasonable possibility, but AFAIK GCC does not use different 
libraries for different language standards.

Hence: no.

Considerations of name mangling or identifier length mentioned by other 
posters are handled transparently by the linker, in a naturally 
completely language-agnostic manner. The linker does not need to know 
what name mangling scheme is used by the compiler proper.

So, again: no.

But, on the other hand, why do you even care? Who knows what compiler 
switches `g++` executable uses to form the proper linker command line? 
And if it doesn't use them today, who knows what compiler switches `g++` 
executable will use tomorrow to form the proper linker command line?

For this reason it kinda makes good sense to just make sure that all 
`g++` parameters are kept as consistent as possible between `g++` 
invocations. Just pass'em all and let `g++` itself sort'em out.

For this reason: yes.

-- 
Best regards,
Andrey Tarasevich

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Thread

g++ and linking Joseph Hesse <joeh@gmail.com> - 2022-01-22 06:32 +0200
  Re: g++ and linking "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-01-22 09:39 +0100
    Re: g++ and linking Richard Damon <Richard@Damon-Family.org> - 2022-01-22 06:30 -0500
      Re: g++ and linking David Brown <david.brown@hesbynett.no> - 2022-01-22 12:53 +0100
      Re: g++ and linking Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-22 16:45 +0100
        Re: g++ and linking Richard Damon <Richard@Damon-Family.org> - 2022-01-22 11:13 -0500
          Re: g++ and linking Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-22 19:00 +0100
      Re: g++ and linking Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-02-01 07:17 -0800
        Re: g++ and linking "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2022-02-01 08:19 -0800
          Re: g++ and linking Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-04-25 07:19 -0700
            Re: g++ and linking "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2022-04-25 09:06 -0700
  Re: g++ and linking Andrey Tarasevich <andreytarasevich@hotmail.com> - 2022-01-22 10:24 -0800

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