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Message-ID: <CANXV_XwaPOOYuAsveVbfNU4tFbw30rkX3AKrBdKzrNNsUxer+Q@mail.gmail.com>
Date: Fri, 15 Mar 2024 20:04:22 +0300
From: Dmitrii Bundin <dmitrii.bundin.a@...il.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Daniel Xu <dxu@...uu.xyz>, 
	Viktor Malik <vmalik@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] tools/resolve_btfids: Include linux/types.h

On Fri, Mar 15, 2024 at 6:41 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> No one reported this, though lots of people
> are building resolve_btfids that uses this header
> as part of the kernel build.

GCC version 7.5.0, GNU Make 4.1
Steps to reproduce:
1. Check out the commit e5eb28f6d1afebed4bb7d740a797d0390bd3a357
2. cd tools/bpf/resolve_btfids/
3. make

The steps above produces the following error messages (similar error
output truncated for clarity):

In file included from main.c:73:0:
/linux/tools/include/linux/btf_ids.h:7:2: error: unknown type name ‘u32’
  u32 cnt;
  ^~~

The other sources including <linux/btf_ids.h> usually includes
(directly or indirectly) <linux/types.h> before which is not the case
for tools/bpf/resolve_btfids/main.c. So that looks reasonable to me to
bring all the required type definitions into scope explicitly in
linux/btf_ids.h. Any thoughts on this?

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