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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/31186] -I/usr/include not taken into account
Date: Sat, 28 Aug 2021 03:45:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D31186

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The remaining environment variables apply only when preprocessing the
particular language indicated. Each specifies a list of directories to be
searched as if specified with -isystem, but after any paths given with -isy=
stem
options on the command line.

If a standard system include directory, or a directory specified with -isys=
tem,
is also specified with -I, the -I option is ignored. The directory is still
searched but as a system directory at its normal position in the system inc=
lude
chain. This is to ensure that GCC=E2=80=99s procedure to fix buggy system h=
eaders and
the ordering for the #include_next directive are not inadvertently changed.=
 If
you really need to change the search order for system directories, use the
-nostdinc and/or -isystem options. See System Headers.


This part specifically:
 If you really need to change the search order for system directories, use =
the
-nostdinc and/or -isystem options.=