Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #15928

Re: macro

Show all headers | View raw

On 2012-01-18, Joe keane <jgk@panix.com> wrote:
> In article <9nnjboFaaoU3@mid.individual.net>,
> Ian Collins  <ian-news@hotmail.com> wrote:
>>I guess the use of "do...while(0)" (and function-like macros in general) 
>>is a hang over from 80s and 90s compiler which didn't inline functions.
>
> Talking today, if someone said 'doesn't inline function work well?'
> [assuming it works well] i'd say 'well yeah, inline function is great'.
>
> I think people learned how to do stuff with macros [that is, if you
> aren't adept at reading/writing macros, you don't really know C], then
> they learned that inline function is available everywhere.
>
> "If the macros work well, why do we want inline function, we will stick
> with the stuff we are used to."

Even if inline isn't available, you can use static functions as a fallback.

In one freeware program that I maintain, I have a configure test for
various ways of doing inline, in a particular order. Two source files
are written written defining the same inline function and linked
together, to verify that the chosen method is not only accepted as
a valid function definition, but will not cause multiple definition clashes
when it is pulled into multiple translation units:

printf "Checking how to declare inline functions ... "

if [ -z "$inline" ] ; then
  for inline in \
    "inline" "static inline" "extern inline" \
    "__inline__" "static __inline__" "extern __inline__" \
    "static"
  do
    cat > conftest1.c <<!
$inline int func(void)
{
  return 0;
}

int main(void)
{
  return func();
}
!
    cat > conftest2.c <<!
$inline int func(void)
{
  return 0;
}
!
    rm -f conftest2
    if ! make conftest2 > conftest.err 2>&1 ; then
	continue
    fi
    break
  done
fi

printf '"%s"\n' "$inline"
printf "#define INLINE $inline\n" >> config.h

If there is no inline, and the compiler doesn't automatically inline
small static functions, you get code bloat.  Get a better compiler for my
program, or live with the bloated code.

When configuring with GCC's gcc, since I don't use the C99 dialect, guess which
item on that list works?  Everything fails right up until "static __inline__".
With GCC's g++, "inline" tests successfully, of course.

> I wonder if this will change over time, where more people can't think of
> a day when inline functions are not universal.  

Even if inline functions aren't universal, INLINE functions can be. :)

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

macro dspfun <dspfun@hotmail.com> - 2012-01-15 05:29 -0800
  Re: macro Dr Nick <3-nospam@temporary-address.org.uk> - 2012-01-15 13:44 +0000
    Re: macro dspfun <dspfun@hotmail.com> - 2012-01-15 05:58 -0800
      Re: macro "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2012-01-15 15:34 +0100
      Re: macro "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-01-15 06:37 -0800
        Re: macro dspfun <dspfun@hotmail.com> - 2012-01-15 07:28 -0800
          Re: macro Philip Lantz <prl@canterey.us> - 2012-01-15 17:30 -0800
            Re: macro Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-16 00:18 -0800
              Re: macro Hans Vlems <hvlems@freenet.de> - 2012-01-16 00:52 -0800
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-16 22:08 +1300
                Re: macro Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-16 03:04 -0800
                Re: macro Markus Wichmann <nullplan@gmx.net> - 2012-01-16 12:42 +0100
        Re: macro jgk@panix.com (Joe keane) - 2012-01-16 14:48 +0000
          Re: macro Keith Thompson <kst-u@mib.org> - 2012-01-16 12:01 -0800
            Re: macro Philip Lantz <prl@canterey.us> - 2012-01-17 01:02 -0800
              Re: macro Keith Thompson <kst-u@mib.org> - 2012-01-17 13:05 -0800
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-18 13:12 +1300
                Re: macro dspfun <dspfun@hotmail.com> - 2012-01-18 01:05 -0800
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-18 22:57 +1300
                Re: macro "osmium" <r124c4u102@comcast.net> - 2012-01-18 06:22 -0600
                Re: macro dspfun <dspfun@hotmail.com> - 2012-01-18 07:50 -0800
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-20 14:09 +1300
                Re: macro blp@cs.stanford.edu (Ben Pfaff) - 2012-01-18 11:28 -0800
                Re: macro Kaz Kylheku <kaz@kylheku.com> - 2012-01-18 21:09 +0000
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-20 15:08 +1300
                [OT] Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-20 15:58 +1300
                Re: [OT] Re: macro Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-20 12:22 +0000
                Re: [OT] Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-21 07:58 +1300
                Re: macro James Kuyper <jameskuyper@verizon.net> - 2012-01-19 22:47 -0500
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-20 17:06 +1300
                Re: macro James Kuyper <jameskuyper@verizon.net> - 2012-01-20 00:12 -0500
                Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-20 18:28 +1300
                Re: macro Keith Thompson <kst-u@mib.org> - 2012-01-20 03:21 -0800
                Re: macro Shao Miller <sha0.miller@gmail.com> - 2012-01-20 10:50 -0500
                Re: macro Shao Miller <sha0.miller@gmail.com> - 2012-01-20 11:46 -0500
                Re: macro Keith Thompson <kst-u@mib.org> - 2012-01-18 14:24 -0800
                Re: macro jgk@panix.com (Joe keane) - 2012-01-18 22:36 +0000
                Re: macro Kaz Kylheku <kaz@kylheku.com> - 2012-01-18 22:50 +0000
            Re: macro jgk@panix.com (Joe keane) - 2012-01-17 22:08 +0000
  Re: macro Keith Thompson <kst-u@mib.org> - 2012-01-15 08:00 -0800
  Re: macro NEON China BLUE <chine.bleu@yahoo.com> - 2012-01-15 08:15 -0800
  Re: macro Ian Collins <ian-news@hotmail.com> - 2012-01-16 09:04 +1300
    Re: macro Philip Lantz <prl@canterey.us> - 2012-01-15 17:36 -0800
  Re: macro Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-16 12:01 +0000

csiph-web