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[bug #60960] Fix/report race problem if having multiple "alias" for the


From: anonymous
Subject: [bug #60960] Fix/report race problem if having multiple "alias" for the same target
Date: Thu, 22 Jul 2021 09:49:16 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

URL:
  <https://savannah.gnu.org/bugs/?60960>

                 Summary: Fix/report race problem if having multiple "alias"
for the same target
                 Project: make
            Submitted by: None
            Submitted on: Thu 22 Jul 2021 01:49:14 PM UTC
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.2.1
        Operating System: None
           Fixed Release: None
           Triage Status: None

    _______________________________________________________

Details:

Our team faced some race problems while building a project with Make.

Precise analysis shows that the problem was in fact, that Make doesn't care if
we have different aliases for the same target.
For example:
```
.PHONY: all ../1/../main.o ../2/../main.o

all: ../1/../main.o ../2/../main.o

../1/../main.o:
ccache gcc -o $@ -c ../main.c

../2/../main.o:
ccache gcc -o $@ -c ../main.c
```

Here, we have 2 targets:
../1/../main.o
../2/../main.o

In fact, this is the same target/file (taking into account relative
directories).
As a result if Make will create several threads (for each target) main.o file
will be written concurrently (race condition).

Make doesn't operate in a wrong way.
Anyway, I think it would be great to have an additional checker in a Makefile
which (at least) will notify the operator about the problem in a Makefile.

P.S. Makefile project, using which it is possible to reproduce the problem is
attached to this ticket.



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Thu 22 Jul 2021 01:49:14 PM UTC  Name: build_race.tar  Size: 20KiB   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=51680>

    _______________________________________________________

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