Disable -Werror=nonnull on getcwd(0, 4096) because GCC incorrectly warns that
the second argument should be NULL with recent glibc.  See:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96832
https://sourceware.org/bugzilla/show_bug.cgi?id=26545

diff --git a/nss/coreconf/nsinstall/nsinstall.c b/nss/coreconf/nsinstall/nsinstall.c
--- a/nss/coreconf/nsinstall/nsinstall.c
+++ b/nss/coreconf/nsinstall/nsinstall.c
@@ -236,14 +236,20 @@ main(int argc, char **argv)
 	return 0;
 
     if (!cwd) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnonnull"
 	cwd = GETCWD(0, PATH_MAX);
+#pragma GCC diagnostic pop
 	if (!cwd)
 	    fail("could not get CWD");
     }
 
     /* make sure we can get into todir. */
     xchdir(todir);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnonnull"
     todir = GETCWD(0, PATH_MAX);
+#pragma GCC diagnostic pop
     if (!todir)
 	fail("could not get CWD in todir");
     tdlen = strlen(todir);
/form></td></tr>
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<div class='path'>path: <a href='/guix/log/?id=2c5bba139237bb19ab4061452eeb3e7fdcdb1142&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=2c5bba139237bb19ab4061452eeb3e7fdcdb1142&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=2c5bba139237bb19ab4061452eeb3e7fdcdb1142&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/cluster.scm?id=2c5bba139237bb19ab4061452eeb3e7fdcdb1142&amp;showmsg=1'>cluster.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/cluster.scm?id=2c5bba139237bb19ab4061452eeb3e7fdcdb1142'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2021-05-28 11:36:03 +0200'>2021-05-28</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/cluster.scm?id=a800224260b5c005307fce6c0c3d85a2ea3095dd'>gnu: libraft: Update to 0.10.1</a></td><td>Dion Mendel</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/cluster.scm (libraft): Update to 0.10.1

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2020-11-30 21:17:25 +0100'>2020-11-30</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/cluster.scm?id=d74c82b24e10ee59a2484577e0e535f36c078a7f'>gnu: drbd-utils: Update to 9.15.1.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/cluster.scm (drbd-utils): Update to 9.15.1.


</td></tr>
<tr class='logheader'><td><span title='2020-10-10 23:39:17 +0200'>2020-10-10</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/cluster.scm?id=210b5282b03a4e5d56c9181b8ac5632a45846549'>gnu: drbd-utils: Update to 9.15.0.</a></td><td>Marius Bakke</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/cluster.scm (drbd-utils): Update to 9.15.0.


</td></tr>
<tr class='logheader'><td><span title='2020-07-02 23:20:51 +0200'>2020-07-02</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/cluster.scm?id=415beccb1d43cc36e03041fe59642929dc3da1e4'>gnu: Add drbd-utils.</a></td><td>Marius Bakke</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/cluster.scm (drbd-utils): New variable.


</td></tr>