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AJvYcCW8QN502JpG7wxBhreedSczKAUK9uyGsLZHpYbLrChtFcBZvfrYa7IDM6gVUpI164/qLa64098YBgLXuH1G3/v6LQx8 X-Gm-Message-State: AOJu0YzAWeZUJPpwXdUqsVs1R0E2DtqA9L7FZvTMW7vxDc3E9Zwl0PJS DAW6OARsm0oyJjlYxITtwaXo6UJZUHuX2GYlSJrsDW17WdOkpIaJ X-Google-Smtp-Source: AGHT+IE9RuPGSOB1Lfd5w9u7xyqGKTNHZf+j+QxgypUxjE5RsG1OjHOpXN6GDLDrm1hhT4whPDNzfQ== X-Received: by 2002:a05:6a21:3288:b0:1b4:efbb:d1d3 with SMTP id adf61e73a8af0-1bcbb6dfba5mr935826637.51.1718752580094; Tue, 18 Jun 2024 16:16:20 -0700 (PDT) Received: from [192.168.0.31] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-705cc96752fsm9448987b3a.50.2024.06.18.16.16.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Jun 2024 16:16:19 -0700 (PDT) Message-ID: <05449fe120951ff8c02f96e20887348db1f505da.camel@gmail.com> Subject: Re: [PATCH bpf-next 3/5] libbpf,bpf: share BTF relocate-related code with kernel From: Eduard Zingerman To: Andrii Nakryiko , Alan Maguire Cc: andrii@kernel.org, acme@redhat.com, ast@kernel.org, daniel@iogearbox.net, jolsa@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, mykolal@fb.com, thinker.li@gmail.com, bentiss@kernel.org, tanggeliang@kylinos.cn, bpf@vger.kernel.org Date: Tue, 18 Jun 2024 16:16:14 -0700 In-Reply-To: References: <20240618162449.809994-1-alan.maguire@oracle.com> <20240618162449.809994-4-alan.maguire@oracle.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2024-06-18 at 15:53 -0700, Andrii Nakryiko wrote: [...] > > +# Some source files are common to libbpf. > > +vpath %.c $(srctree)/kernel/bpf:$(srctree)/tools/lib/bpf >=20 > this is something new, what does vpath do? (sorry if this was > discussed before and I missed it) I was unfamiliar with this thing as well: https://www.gnu.org/software/make/manual/html_node/Selective-Search.html basically it allows to add a directory to dependency search path. An alternative would be to make a soft link, e.g. like with ./tools/testing/selftests/bpf/disasm.c [...]