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Date:   Fri, 08 May 2020 00:39:16 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: linux-next 20200506 - build failure with net/bpfilter/bpfilter_umh

My kernel build came to a screeching halt with:

  CHECK   net/bpfilter/bpfilter_kern.c
  CC [M]  net/bpfilter/bpfilter_kern.o
  CC [U]  net/bpfilter/main.o
  LD [U]  net/bpfilter/bpfilter_umh
/usr/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
make[2]: *** [scripts/Makefile.userprogs:36: net/bpfilter/bpfilter_umh] Error 1
make[1]: *** [scripts/Makefile.build:494: net/bpfilter] Error 2
make: *** [Makefile:1726: net] Error 2

The culprit is this commit:

commit 0592c3c367c4c823f2a939968e72d39360fce1f4
Author: Masahiro Yamada <masahiroy@...nel.org>
Date:   Wed Apr 29 12:45:15 2020 +0900

    bpfilter: use 'userprogs' syntax to build bpfilter_umh

and specifically, this line:

+userldflags += -static

At least on Fedora, this dies an ugly death unless you have the glibc-static RPM
installed (which is *not* part of the glibc-devel RPM).  Not sure how to fix this, or
give a heads-up that there's a new requirement that might break the build.


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