What happens before main()?

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  • Tony
    #1

    What happens before main()?

    What happens before main()?

    Perhaps someone can explain it succintly and perhaps
    someone has a link where it is described? crt0.lib or
    something like that comes to mind (surely I have the
    source code to that given that I have a number of
    compilers (some very old) but I'd rather get some
    rough idea first of what's happening there). Is it just
    setting up an environment in which the C++ library
    will work? What happens from the time a program
    is started (typing the name on the command line and
    pressing enter, for example) until it starts initializing
    application program objects and then ending up at main()?

    Tony



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    • Noah Roberts
      #2
      Re: What happens before main()?


      Tony wrote:
      What happens before main()?
      >
      Perhaps someone can explain it succintly and perhaps
      someone has a link where it is described? crt0.lib or
      something like that comes to mind (surely I have the
      source code to that given that I have a number of
      compilers (some very old) but I'd rather get some
      rough idea first of what's happening there). Is it just
      setting up an environment in which the C++ library
      will work? What happens from the time a program
      is started (typing the name on the command line and
      pressing enter, for example) until it starts initializing
      application program objects and then ending up at main()?
      It's implementation defined.

        Comment

        • Victor Bazarov
          #3
          Re: What happens before main()?

          Tony wrote:
          What happens before main()?
          Construction of static objects defined at the namespace
          level happens. Everything else is implementation-defined.
          Perhaps someone can explain it succintly and perhaps
          someone has a link where it is described?
          Perhaps.
          crt0.lib or
          something like that comes to mind (surely I have the
          source code to that given that I have a number of
          compilers (some very old) but I'd rather get some
          rough idea first of what's happening there). Is it just
          setting up an environment in which the C++ library
          will work?
          Yes. Probably. In your system, that is.
          What happens from the time a program
          is started (typing the name on the command line and
          pressing enter, for example) until it starts initializing
          application program objects and then ending up at main()?
          That's up to the hosting environment and beyond the scope
          of this newsgroup.

          V
          --
          Please remove capital 'A's when replying by e-mail
          I do not respond to top-posted replies, please don't ask


            Comment

            • Pete Becker
              #4
              Re: What happens before main()?

              Noah Roberts wrote:
              Tony wrote:
              >What happens before main()?
              >>
              >Perhaps someone can explain it succintly and perhaps
              >someone has a link where it is described? crt0.lib or
              >something like that comes to mind (surely I have the
              >source code to that given that I have a number of
              >compilers (some very old) but I'd rather get some
              >rough idea first of what's happening there). Is it just
              >setting up an environment in which the C++ library
              >will work? What happens from the time a program
              >is started (typing the name on the command line and
              >pressing enter, for example) until it starts initializing
              >application program objects and then ending up at main()?
              >
              It's implementation defined.
              >
              Implementation-specific, but not implementation-defined. The latter is a
              technical term in the C++ standard. It requires that the implementation
              document its behavior.

              --

              -- Pete
              Roundhouse Consulting, Ltd. (www.versatilecoding.com)
              Author of "The Standard C++ Library Extensions: a Tutorial and
              Reference." (www.petebecker.com/tr1book)

                Comment

                • Noah Roberts
                  #5
                  Re: What happens before main()?


                  Victor Bazarov wrote:
                  Tony wrote:
                  What happens before main()?
                  >
                  Construction of static objects defined at the namespace
                  level happens.
                  What about static objects at the class level? Is that different?

                    Comment

                    • Tony
                      #6
                      Re: What happens before main()?


                      "Victor Bazarov" <v.Abazarov@com Acast.netwrote in message
                      news:FIKdncXpib c8EerYnZ2dnUVZ_ rWdnZ2d@comcast .com...
                      Tony wrote:
                      >What happens before main()?
                      >
                      Construction of static objects defined at the namespace
                      level happens. Everything else is implementation-defined.
                      Sounds like something I may be hacking on at some time.
                      Maybe all that is necessary is the static initialization and
                      main() is too specialized for a specific paradigm (the UNIX
                      filter type of program).

                      Tony


                        Comment

                        • Gavin Deane
                          #7
                          Re: What happens before main()?


                          Noah Roberts wrote:
                          Victor Bazarov wrote:
                          Tony wrote:
                          What happens before main()?
                          Construction of static objects defined at the namespace
                          level happens.
                          >
                          What about static objects at the class level? Is that different?
                          The definition of a class's static data member has to appear at
                          namespace scope so Victor's statement implicitly includes static data
                          members.

                          Gavin Deane

                            Comment

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