Re: Word For Today: “Uglification”

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From	Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: Word For Today: “Uglification”
Date	Wed, 13 Mar 2024 11:56:29 -0700
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David Brown <david.brown@hesbynett.no> writes:
> On 13/03/2024 16:15, Keith Thompson wrote:
>> Michael S <already5chosen@yahoo.com> writes:
>> [...]
>>> I just tried three compilers and [in absence of -I options] all 3 work
>>> as expected, i.e. ignored stdio.h in current directory.
>>> None of the three was of the variety that you appear to prefer.
>>> Mine's are mundane stuff.
>>>
>>> However all three took local file when I had given them an option -I.
>>> Not sure what to make of this. Whatever happens with
>>> non-default options is probably in "implementation-defined"
>>> domain as far as the C Standard is concerned, but I still
>>> expected that such common option as  -I would not affect standard
>>> headers.
>> According to the GNU cpp manual, the "-I" option prepends
>> directories to
>> the search path used for <> headers, and the "-iquote" option prepends
>> directories to the search path used for "" headers.
>> I find that a bit surprising.
>
> You are not quite correct - and I find /that/ a bit surprising!
>
> The -I option applies equally to <...> and "..." headers.

I believe that's consistent with what I wrote, though I probably wasn't
clear enough.  To expand on it:

There are two lists of locations (typically directories).  Let's call
them the <>-list (described in N1570 6.10.2p2) and the ""-list
(described in N1570 6.10.2p3).

#include <foo.h> searches the <>-list.

#include "foo.h" searches the ""-list; if that fails, it then searches
the <>-list as if for #include <foo.h>.

The -I option prepends directories to the <>-list, which means it
affects both #include <foo.h> and #include "foo.h".  But for
#include "foo.h", a foo.h file in the same directory as the including
file will always be found first if it exists.

[...]

> The complete description is here:
> <https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html>.
[...]
[slightly reformatting quoted text]
>      1. For the quote form of the include directive, the directory of
>         the current file is searched first.
>
>      2. For the quote form of the include directive, the directories
>         specified by -iquote options are searched in left-to-right
>         order, as they appear on the command line.
>
>      3. Directories specified with -I options are scanned in
>         left-to-right order.
>
>      4. Directories specified with -isystem options are scanned in
>         left-to-right order.
>
>      5. Standard system directories are scanned.
>
>      6. Directories specified with -idirafter options are scanned in
>         left-to-right order.

What I called the ""-list is described in steps 1-2.
What I called the <>-list is described in steps 3-6.

[...]

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Medtronic
void Void(void) { Void(); } /* The recursive call of the void */

Thread

Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 00:14 +0000
  Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-11 18:15 -0700
    Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 01:34 +0000
      Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-11 19:56 -0700
  Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 03:30 +0000
    Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-14 10:23 -0700
      Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 14:31 -0700
        Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-14 23:59 +0000
          Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:01 +0000
          Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 17:11 -0700
            Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:33 +0000
            Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-15 09:15 +0100
        Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 17:15 -0700
          Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-15 00:34 +0000
            Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 19:19 -0700
              Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-15 03:17 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-14 20:44 -0700
                Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-15 09:22 +0100
        Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-14 19:49 -0700
  Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-12 01:33 -0400
    Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 06:14 +0000
      Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 06:21 +0000
      Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 07:44 +0000
        Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-12 08:03 +0000
          Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-12 11:10 +0100
            Re: Word For Today: “Uglification” Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-03-12 17:46 +0300
              Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 14:53 +0000
                Re: Word For Today: “Uglification” Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-03-12 18:09 +0300
                Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 15:42 +0000
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 18:50 +0000
                Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-12 22:29 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 16:00 -0700
                Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-13 11:45 +0000
                Re: Word For Today: “Uglification” Michael S <already5chosen@yahoo.com> - 2024-03-13 14:12 +0200
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 08:15 -0700
                Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 18:47 +0100
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 11:56 -0700
                Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 22:07 +0100
                Re: Word For Today: “Uglification” David Brown <david.brown@hesbynett.no> - 2024-03-13 16:40 +0100
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 15:48 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 09:03 -0700
                Re: Word For Today: “Uglification” bart <bc@freeuk.com> - 2024-03-13 16:44 +0000
                Re: Word For Today: “Uglification” Nick Bowler <nbowler@draconx.ca> - 2024-03-13 17:01 +0000
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 02:53 +0000
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 18:42 +0000
            Re: Word For Today: “Uglification” Blue-Maned_Hawk <bluemanedhawk@invalid.invalid> - 2024-03-12 22:07 +0000
          Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 23:13 +0000
            Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 16:29 -0700
              Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-13 09:01 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 08:06 -0700
                Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 21:51 +0000
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 22:16 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 15:26 -0700
                Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-13 22:33 +0000
                Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 22:50 +0000
                Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-13 16:06 -0700
                Re: Word For Today: “Uglification” Richard Kettlewell <invalid@invalid.invalid> - 2024-03-13 23:32 +0000
                Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-14 00:40 +0000
                Re: Word For Today: “Uglification” scott@slp53.sl.home (Scott Lurndal) - 2024-03-13 23:15 +0000
                Re: Word For Today: “Uglification” Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-06-18 23:09 -0700
            Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 00:23 +0000
      Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-12 11:51 -0400
        Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-12 21:31 +0000
          Re: Word For Today: “Uglification” Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-03-12 15:21 -0700
          Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-13 03:36 -0400
            Re: Word For Today: “Uglification” Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-03-13 21:52 +0000
              Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-13 22:10 +0000
              Re: Word For Today: “Uglification” James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-03-13 20:47 -0400
  Re: Word For Today: “Uglification” Kaz Kylheku <433-929-6894@kylheku.com> - 2024-03-12 06:15 +0000

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