From: Simon Marchi <simark@simark.ca>
To: Fangrui Song <maskray@google.com>,
binutils@sourceware.org, gdb-patches@sourceware.org
Subject: Re: [PATCH] binutils, gdb: support zstd compressed debug sections
Date: Mon, 19 Sep 2022 02:55:08 -0400 [thread overview]
Message-ID: <15fe4352-79e1-acd5-5a71-fc40e19047a8@simark.ca> (raw)
In-Reply-To: <20220919040115.31326-1-maskray@google.com>
> diff --git a/config/zstd.m4 b/config/zstd.m4
> new file mode 100644
> index 00000000000..b8b3a199730
> --- /dev/null
> +++ b/config/zstd.m4
> @@ -0,0 +1,12 @@
> +AC_DEFUN([AM_ZSTD],
> +[
> + zstdlib=
> + AC_ARG_WITH(system-zstd,
> + [AS_HELP_STRING([--with-system-zstd], [use installed zstd])],
> + if test x$with_system_zstd = xyes ; then
> + zstdlib=-lzstd
> + AC_DEFINE(HAVE_ZSTD_H)
> + fi
> + )
> + AC_SUBST(zstdlib)
> +])
Hi Fangrui,
I understand that you did this by copying zlib here. However, the only
reason we have a --use-system-zlib is because the binutils-gdb contains
a copy of zlib, which is used by default, and --use-system-zlib can be
used to prefer the system version. Since we don't carry a copy of zstd
in the tree, I don't think we need --with-system-zstd.
However, since zstd ships with a .pc file, my preference would be to use
PKG_CHECK_MODULES to have pkg-config find the right flags, and have
--with/--without-zstd. Same as I did for the msgpack library here:
https://gitlab.com/gnutools/binutils-gdb/-/commit/2952f10cd79af4645222f124f28c7928287d8113
I am not a binutils maintainers though (just GDB), so in the end it's up
to the binutils maintainers to decide and GDB will probably follow suit.
> diff --git a/configure.ac b/configure.ac
> index a5555a9c91b..f7316b24ac6 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -246,6 +246,9 @@ if test x$with_system_zlib = xyes ; then
> noconfigdirs="$noconfigdirs zlib"
> fi
>
> +AC_ARG_WITH(system-zstd,
> +[AS_HELP_STRING([--with-system-zstd], [use installed zstd])])
> +
I don't think you need this change. --with-system-zlib exists here
because we need to decide whether or not to build the local zlib. But
since we don't have a local zstd...
Simon
next prev parent reply other threads:[~2022-09-19 6:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 4:01 Fangrui Song
2022-09-19 6:55 ` Simon Marchi [this message]
2022-09-19 8:51 ` Fangrui Song
2022-09-19 10:54 ` Simon Marchi
2022-09-19 16:45 ` Fangrui Song
2022-09-20 1:11 ` Simon Marchi
2022-09-19 9:13 ` Jan Beulich
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