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Re: -iquotedir
- From: Ian Lance Taylor <iant at google dot com>
- To: ali hagigat <hagigatali at gmail dot com>
- Cc: gcc-help at gcc dot gnu dot org
- Date: Mon, 09 May 2011 23:04:37 -0700
- Subject: Re: -iquotedir
- References: <BANLkTikmVinkF-6_uSkoKvxgTZ1szROnmw@mail.gmail.com>
ali hagigat <hagigatali@gmail.com> writes:
> This option does not make sense! When we use -I option, it is not used
> for â#include <file >â. Is that right?
No, that is not correct. A -I option is used for both #include "FILE"
and #include <FILE>.
> Or -I search path is used for â#include <file >â but the file is
> tagged as a system file?
That is true.
> My another concern is the explanation of -I option!!:
> "If a standard system include directory, or a directory specified with
> â-isystemâ, is also specified with â-Iâ, the â-Iâ option will be
> ignored."
>
> In this case -I option and the directory after that are not ignored!!
> -I is replaced with -isystem. When you have written "ignored", it
> suggests that -I does not be considered.
I'm not sure I understand the distinction you are drawing. Are you
saying that the compiler behaves as though the -I were replaced with
-isystem? As far as I know, that is not the case. I believe the
compiler really does act as though the -I option were not specified.
> Then the manual continues:
> "The directory will still be searched but as a system directory at its
> normal position in the system
> include chain"
>
> When a beginner reads your sentence he asks what is the system include
> chain? and what is the normal position? Is it the point where -I has
> been used on the command line? or it is pointing to the directory of
> the system which is used by gcc when searching headers.
Patches welcome.
Ian