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From: William Tambe <tambewilliam@gmail.com>
Date: Sun, 12 Apr 2020 12:06:17 -0400
Message-ID: <CAF8i9mNpK_7iWndtGTxk_-9L61=2rB_Yvv37fi9Ph9vXC0QXiQ@mail.gmail.com>
Subject: Re: How to customize GCC builtin search paths
To: Jim Wilson <jimw@sifive.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
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On Fri, Apr 10, 2020 at 1:16 PM Jim Wilson <jimw@sifive.com> wrote:
>
> On Thu, Apr 9, 2020 at 7:52 PM William Tambe via Gcc-help
> <gcc-help@gcc.gnu.org> wrote:
> > How to customize GCC builtin search paths that it uses for %s in its
> > specs syntax ?
>
> This is startfile_prefixes in gcc.c.

I can hardly find examples on how to use startfile_prefixes. Currently
when running gcc as follow:
arch-elf-gcc -v test.c

I get the following excerpt showing how gcc looks for includes:

#include "..." search starts here:
#include <...> search starts here:
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/include
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/include-fixed
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/../../../../arch-elf/include

However, I am looking to change how gcc looks for includes as follow:

#include "..." search starts here:
#include <...> search starts here:
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/../../../../include
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/../../../../arch-elf/include
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/include
/opt/arch-toolchain/lib/gcc/arch-elf/9.2.0/include-fixed

Any idea what piece of code populate the list of paths where to look
for includes ?

>
> Jim