[bug #63307] make 4.4 passes ignored SIGPIPE on to children

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?63307>

                 Summary: make 4.4 passes ignored SIGPIPE on to children
                 Project: make
               Submitter: None
               Submitted: Wed 02 Nov 2022 03:12:02 PM UTC
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.4
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 02 Nov 2022 03:12:02 PM UTC By: Anonymous
Test case:

$ cat Makefile
all:
        (sleep 1; echo foo; echo bar >&2) | :
$ make-4.3
(sleep 1; echo foo; echo bar >&2) | :
$ make-4.4
(sleep 1; echo foo; echo bar >&2) | :
/bin/sh: 1: echo: Broken pipe
bar
$ 

I asked in #63248 whether this was intentional. It was not, so here is a bug
for it. What happens in make 4.3 is the sleep makes it so that the "echo foo"
is extremely unlikely to start until the : has already terminated. Then, when
"echo foo" attempts to write, the whole shell process receives SIGPIPE. What
happens in make 4.4 is that the shell process does not receive SIGPIPE and
continues processing.

This causes SuSE bug 33947
(https://lists.gnu.org/archive/html/bug-diffutils/2019-01/msg00000.html,
diffutils testsuite failure when SIGPIPE is ignored) to appear in environments
where it previously did not, after upgrading to make 4.4.







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