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Re: g++ and linking

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On 22 Jan 2022 05:32, 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.

At one time, probably in the 1990's? or so but I don't know, linking 
changed from considering only 8 significant characters in a name, to 
supporting effectively arbitrarily long names.

The standardized versions of the language have never had a restriction 
to 8 significant characters, but the names in the iostreams stuff and in 
the C library are typical of the kind of names programmers invented to 
support that restriction.

Another area where linking could conceivably have had different 
requirements for different versions of the language, is the use of weak 
symbols for `inline` things. C++17 appeared to add the possibility of 
`inline` variables. However, the wording for templates have had that as 
a requirement that linkers had to be able to deal with, since C++98.

The only linker requirements change I know of for the standardized 
language is for C++20 modules, and presumably there it's not the good 
old common linker that deals with it (disclaimer: no experience).


- Alf

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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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