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Groups > comp.lang.c > #108558

Re: Macro Expansion

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Macro Expansion
Date 2017-04-26 12:00 -0700
Organization None to speak of
Message-ID <lnlgqnm1u7.fsf@kst-u.example.com> (permalink)
References (2 earlier) <o4teqp$5ke$1@dont-email.me> <o52pbd$5mp$1@dont-email.me> <35bf4dd4-b642-4a98-9d7e-f577a1667a58@googlegroups.com> <o53g5e$v6u$1@dont-email.me> <02e4ec4b-b840-4ce3-b45d-3aeb82d00ef3@googlegroups.com>

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Thiago Adams <thiago.adams@gmail.com> writes:
[...]
> One more test case, I saw this on windows headers.
>
>
> #define _VARIANT_BOOL    /##/
>
> struct {
>   _VARIANT_BOOL bool;
> }
>
> This will expand to :
>
> struct {
>  
> }

That's not valid.  Comments are replaced by spaces in translation phase 3.
Macros are expanded in phase 4.

gcc and clang both complain that pasting '/' and '/' does not give a
valid preprocessing token.  (And the empty struct would be a syntax
error anyway.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 18:35 +0000
  Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-01-07 11:23 -0800
    Re: Macro Expansion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-07 21:28 +0000
  Re: Macro Expansion Siri Cruise <chine.bleu@yahoo.com> - 2017-01-07 11:45 -0800
    Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 20:16 +0000
      Re: Macro Expansion Siri Cruise <chine.bleu@yahoo.com> - 2017-01-07 12:23 -0800
        Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 20:31 +0000
          Re: Macro Expansion Siri Cruise <chine.bleu@yahoo.com> - 2017-01-07 12:42 -0800
          Re: Macro Expansion Ian Collins <ian-news@hotmail.com> - 2017-01-08 14:42 +1300
            Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 13:18 +0000
  Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 20:15 +0000
    Re: Macro Expansion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-07 20:42 +0000
      Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 22:50 +0000
        Re: Macro Expansion Ian Collins <ian-news@hotmail.com> - 2017-01-08 11:59 +1300
          Re: Macro Expansion Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-07 15:10 -0800
        Re: Macro Expansion supercat@casperkitty.com - 2017-01-07 17:24 -0800
          Re: Macro Expansion Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 21:55 -0800
            Re: Macro Expansion supercat@casperkitty.com - 2017-01-16 09:06 -0800
              Re: Macro Expansion Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-31 08:51 -0800
                Re: Macro Expansion supercat@casperkitty.com - 2017-01-31 13:06 -0800
                Re: Macro Expansion Tim Rentsch <txr@alumni.caltech.edu> - 2017-02-03 07:49 -0800
                Re: Macro Expansion supercat@casperkitty.com - 2017-02-03 12:03 -0800
                Re: Macro Expansion Tim Rentsch <txr@alumni.caltech.edu> - 2017-02-09 09:00 -0800
        Re: Macro Expansion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-08 01:37 +0000
          Re: Macro Expansion Jean-Marc Bourguet <jm@bourguet.org> - 2017-01-08 10:22 +0100
  Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-01-07 12:18 -0800
    Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 20:28 +0000
      Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-01-07 12:36 -0800
        Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-07 22:59 +0000
  Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-01-08 00:20 -0800
    Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 13:30 +0000
      Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-10 14:00 +0000
        Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-01-10 07:43 -0800
          Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-10 17:47 +0000
            Re: Macro Expansion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-10 22:49 +0000
              Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-10 23:28 +0000
              Re: Macro Expansion "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-10 18:51 -0500
                Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-11 00:06 +0000
          Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-10 20:30 +0000
            Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-04-26 10:04 -0700
              Re: Macro Expansion Keith Thompson <kst-u@mib.org> - 2017-04-26 12:00 -0700
                Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-04-26 12:24 -0700
              Re: Macro Expansion bartc <bc@freeuk.com> - 2017-04-26 20:12 +0100
                Re: Macro Expansion Thiago Adams <thiago.adams@gmail.com> - 2017-04-26 12:34 -0700
                Re: Macro Expansion jameskuyper@verizon.net - 2017-04-26 13:46 -0700
  Re: Macro Expansion Jean-Marc Bourguet <jm@bourguet.org> - 2017-01-08 10:13 +0100
    Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 13:10 +0000
      Re: Macro Expansion Jean-Marc Bourguet <jm@bourguet.org> - 2017-01-08 15:51 +0100
        Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 17:17 +0000
          Re: Macro Expansion supercat@casperkitty.com - 2017-01-08 11:04 -0800
            Re: Macro Expansion Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-08 11:10 -0800
              Re: Macro Expansion supercat@casperkitty.com - 2017-01-08 14:08 -0800
            Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 19:49 +0000
              Re: Macro Expansion supercat@casperkitty.com - 2017-01-08 14:17 -0800
          Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 19:19 +0000
          Re: Macro Expansion Jean-Marc Bourguet <jm@bourguet.org> - 2017-01-08 21:43 +0100
      Re: Macro Expansion supercat@casperkitty.com - 2017-01-08 10:43 -0800
      Re: Macro Expansion Keith Thompson <kst-u@mib.org> - 2017-01-08 12:39 -0800
  Re: Macro Expansion antispam@math.uni.wroc.pl - 2017-01-08 22:54 +0000
    Re: Macro Expansion "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-08 18:36 -0500
      Re: Macro Expansion antispam@math.uni.wroc.pl - 2017-01-09 01:15 +0000
        Re: Macro Expansion "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-08 20:49 -0500
    Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-08 23:53 +0000
      Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-09 01:11 +0000
      Re: Macro Expansion antispam@math.uni.wroc.pl - 2017-01-09 01:31 +0000
        Re: Macro Expansion BartC <bc@freeuk.com> - 2017-01-10 11:28 +0000

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