Re: [PATCH bpf] samples/bpf: Update README.rst and Makefile for manually compiling LLVM and clang

From: Yonghong Song
Date: Tue Jan 19 2021 - 02:01:10 EST

On 1/18/21 7:53 PM, Tiezhu Yang wrote:
In the current samples/bpf/README.rst, the url of llvm and clang git
may be out of date, they are unable to access:

Let us just rephrase the above more clearly, something like below.

The current clang/llvm build procedure in samples/bpf/README.rst is
out of date. See below that the links are not accessible any more.

$ git clone
Cloning into 'llvm'...
fatal: unable to access ' ': Maximum (20) redirects followed
$ git clone --depth 1
Cloning into 'clang'...
fatal: unable to access ' ': Maximum (20) redirects followed

The llvm community has adopted new ways to build the compiler.
[followed by your descriptions below]

There are different ways to build llvm/clang, I find the Clang Getting
Started page [1] has one way, as Yonghong said, it is better to just
copy the build procedure in Documentation/bpf/bpf_devel_QA.rst to keep

I verified the procedure and it is proved to be feasible, so we should
update README.rst to reflect the reality. At the same time, update the
related comment in Makefile.


Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>

Ack with minor nits in the above. Also, this is a documentation update.
I think it is okay to target the patch to bpf-next instead of bpf.

Acked-by: Yonghong Song <yhs@xxxxxx>