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Date:   Sun, 14 Feb 2021 19:49:22 +0800
From:   Stephen Zhang <stephenzhangzsd@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Tom Roeder <tmroeder@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v1] clang_tools:gen_compile_commands: Change the default
 source directory

Masahiro Yamada <masahiroy@...nel.org> 于2021年2月13日周六 下午8:46写道:
> This is the steps I tested.
>
>
> masahiro@...ar:~/ref/linux$ make O=build  defconfig all -j24
>   [ snip ]
> masahiro@...ar:~/ref/linux$
> ./scripts/clang-tools/gen_compile_commands.py  -d build
> masahiro@...ar:~/ref/linux$ grep '"file":' compile_commands.json |
> grep scripts/ | head -n5
>     "file": "/home/masahiro/ref/linux/scripts/mod/empty.c"
>     "file": "/home/masahiro/ref/linux/scripts/mod/sumversion.c"
>     "file": "/home/masahiro/ref/linux/scripts/mod/file2alias.c"
>     "file": "/home/masahiro/ref/linux/scripts/mod/modpost.c"
>     "file": "/home/masahiro/ref/linux/build/scripts/kconfig/parser.tab.c"
>
> --
> Best Regards
> Masahiro Yamada

Thanks. Nathan had a detailed description about  this:

> $ make O=build
>
> will work with '-d .' because the .cmd files are in '.' and the source
> files will be placed relative to '.', which is correct. Your command
> does not work for two reasons:
>
> 1. You are using a build directory that is not a subpath of the source
> directory. In other words, this script would not work for
>
> $ make O=/tmp/build
>
> because '-d /tmp/build' needs to be used to find the .cmd files but then
> the relative path of the source files is messed up, as you point out.

This may help you reproduce the problem. So you shoud try:

>masahiro@...ar:~/ref/linux$ make O=/tmp/build  defconfig all -j24

where the build directory  is not a subpath of the source directory.

--
Best Regards
Stephen Zhang

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