This patch allows reptyr to build with gcc 7. It is taken from reptyr mainline patches
fa0d63f and b45fd92.

https://github.com/nelhage/reptyr/commit/fa0d63ff8c488be15976e5353580b565e85586a1
https://github.com/nelhage/reptyr/commit/b45fd9238958fcf2d8f3d6fc23e6d491febea2ac

Patch by Nelson Elhage <nelhage@nelhage.com>.

diff --git a/attach.c b/attach.c
index bd8ef8c..8d9cbf8 100644
--- a/attach.c
+++ b/attach.c
@@ -389,8 +389,11 @@ int setup_steal_socket(struct steal_pty_state *steal) {
         return errno;
 
     steal->addr_un.sun_family = AF_UNIX;
-    snprintf(steal->addr_un.sun_path, sizeof(steal->addr_un.sun_path),
-             "%s/reptyr.sock", steal->tmpdir);
+    if (snprintf(steal->addr_un.sun_path, sizeof(steal->addr_un.sun_path),
+                 "%s/reptyr.sock", steal->tmpdir) >= sizeof(steal->addr_un.sun_path)) {
+        error("tmpdir path too long!");
+        return ENAMETOOLONG;
+    }
 
     if ((steal->sockfd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
         return errno;
diff --git a/platform/linux/linux.h b/platform/linux/linux.h
index 9e6b78a..3ec5a99 100644
--- a/platform/linux/linux.h
+++ b/platform/linux/linux.h
@@ -40,6 +40,7 @@
 #include <sys/ptrace.h>
 #include <asm/ptrace.h>
 #include <sys/types.h>
+#include <sys/sysmacros.h>
 #include <sys/user.h>
 #include <unistd.h>
 #include <stdlib.h>
d47875ff4e1735e'>tree</a><a href='/guix/commit/etc/completion/bash/guix-daemon?id=801c930fc63f1077ea4e3d65fd47875ff4e1735e'>commit</a><a href='/guix/diff/etc/completion/bash/guix-daemon?id=801c930fc63f1077ea4e3d65fd47875ff4e1735e'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/completion/bash/guix-daemon'>
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='msg-avail'>...<span class='msg-tooltip'>Having substitute URLs explicitly listed in the service startup file
makes it clearer what should be modified to permanently change the list
of substitute URLs.

* config-daemon.ac: Rename ‘guix_substitute_urls’ to
‘GUIX_SUBSTITUTE_URLS’ and substitute it.
* nix/local.mk (etc/guix-%.service, etc/init.d/guix-daemon)
(etc/guix-%.conf): Substitute it.
* etc/guix-daemon.conf.in, etc/guix-daemon.service.in,
etc/init.d/guix-daemon.in: Add an explicit ‘--substitute-urls’ option.

Change-Id: Ie491b7fab5c42e54dca582801c03805a85de2bf9
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-07 23:54:20 -0400'>2021-07-07</span></td><td><a href='/guix/commit/etc/guix-daemon.conf.in?id=4cbe0127a668cbcc64087c5d311308b59d39b104'>guix-install.sh: Prompt for configuring substitutes discovery.</a><span class='msg-avail'>...<span class='msg-tooltip'>Also ensure prompt_yes_no always print the message with a trailing space,
which is more pleasing to the eye.

* etc/guix-daemon.conf.in &lt;--discover=no&gt;: New guix-daemon option.
* etc/guix-daemon.service.in: Likewise.
* etc/init.d/guix-daemon.in: Likewise.
* etc/openrc/guix-daemon.in: Likewise.
* etc/guix-install.sh (configure_substitute_discovery): New procedure.
(sys_enable_guix_daemon): Ask the user whether automatic substitute discovery
should be enabled.  Set the '--discover' argument accordingly.
(prompt_yes_no): Add a trailing space to the message.
(sys_authorize_build_farms): Remove trailing space from the message argument.
* NEWS (Distribution): Add news.
</span></span></td><td>Maxim Cournoyer</td></tr>