From: Steve Dickson <SteveD@RedHat.com>
To: Patrick Steinhardt <ps@pks.im>, linux-nfs@vger.kernel.org
Subject: Re: [PATCH 1/3] configure.ac: more carefully detect availability of res_querydomain(3)
Date: Wed, 27 Feb 2019 12:14:16 -0500 [thread overview]
Message-ID: <01523a34-5c3b-383a-a532-cb9bc0f4af8f@RedHat.com> (raw)
In-Reply-To: <a6f2aaea93c1293e62d5109b10d47a7675a45393.1549290423.git.ps@pks.im>
On 2/4/19 9:31 AM, Patrick Steinhardt wrote:
> Since glibc 2.2, the function res_querydomain(3) is implemented as a
> define to `__res_querydomain`. Due to this implementation detail, using
> `AC_CHECK_LIB` with a symbol name of "res_querydomain" will cause a
> linking failure and thus fail to detect its availability. This is why
> right now, we try to detect availability of `__res_querydomain` instead.
>
> Unfortunately, this may break on other platforms where there is no
> `__res_querydomain` but only the function without leading underscores.
> To fix this, we can perform another `AC_CHECK_LIB([resolv],
> [res_querydomain], ...)` call in case where the other one was not found
> and only raise an error if both symbols weren't found.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
Committed...
steved.
> ---
> configure.ac | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/configure.ac b/configure.ac
> index 4bf5aea..cb9d921 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -411,7 +411,8 @@ if test "$enable_gss" = yes; then
> fi
>
> dnl libdnsidmap specific checks
> -AC_CHECK_LIB([resolv], [__res_querydomain], , AC_MSG_ERROR(res_querydomain needed))
> +AC_CHECK_LIB([resolv], [__res_querydomain], ,
> + AC_CHECK_LIB([resolv], [res_querydomain], , AC_MSG_ERROR(res_querydomain needed)))
>
> AC_ARG_ENABLE([ldap],
> [AS_HELP_STRING([--disable-ldap],[Disable support for LDAP @<:default=detect@:>@])])
>
prev parent reply other threads:[~2019-02-27 17:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 14:31 [PATCH 1/3] configure.ac: more carefully detect availability of res_querydomain(3) Patrick Steinhardt
2019-02-04 14:31 ` [PATCH 2/3] file: fix missing include for PATH_MAX constant Patrick Steinhardt
2019-02-27 17:14 ` Steve Dickson
2019-02-04 14:31 ` [PATCH 3/3] svc_socket: fix use of undefined macro HAVE_GETRPCBYNUMBER_R Patrick Steinhardt
2019-02-27 17:16 ` Steve Dickson
2019-02-27 17:37 ` Patrick Steinhardt
2019-02-22 7:52 ` [PATCH 1/3] configure.ac: more carefully detect availability of res_querydomain(3) Patrick Steinhardt
2019-02-22 20:40 ` J. Bruce Fields
2019-02-27 16:41 ` Steve Dickson
2019-02-27 17:14 ` Steve Dickson [this message]
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