[Bug 12029] New: Makefile missing dep gives parallel race for rounding.h

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=12029

            Bug ID: 12029
           Summary: Makefile missing dep gives parallel race for
                    rounding.h
           Product: rsync
           Version: 3.1.2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P5
         Component: core
          Assignee: wayned at samba.org
          Reporter: greg.whiteley at gmail.com
        QA Contact: rsync-qa at samba.org

I've observed a make race when building in parallel against 3.1.1 and 3.1.2.

Reproducibility is low - I've had a CI machine building ~once a week for over a
year and just now its hit twice in a row - never before.  Can't reproduce it on
my own machine.

> $ git clone ...
> ./configure --prefix=/path/to/sysroot/rpi/usr --disable-ipv6 --disable-locale --disable-iconv-open --disable-iconv --disable-acl-support --disable-xattr-support --host=arm-linux-gnueabihf
> $ make -j8
> perl ./mkproto.pl ./*.c ./lib/compat.c
> sed 's;\@bindir\@;/home/buildbot/slaves/enterprise-master/enterprise-rootfs-master/build/sysroot/rpi/usr/bin;g' <./rsync-ssl.in >rsync-ssl
> sed 's;\@stunnel4\@;stunnel;g' <./stunnel-rsync.in >stunnel-rsync
> sed 's;\@bindir\@;/home/buildbot/slaves/enterprise-master/enterprise-rootfs-master/build/sysroot/rpi/usr/bin;g' <./stunnel-rsyncd.conf.in >stunnel-rsyncd.conf
> Copying srcdir rsync.1
> cp: cannot stat ‘./rsync.1’: No such file or directory
> make: [man-copy] Error 1 (ignored)
> Copying srcdir rsyncd.conf.5
> cp: cannot stat ‘./rsyncd.conf.5’: No such file or directory
> make: [man-copy] Error 1 (ignored)
> arm-linux-gnueabihf-gcc -std=gnu99 -I. -I. -I./zlib -I./popt -g -O2 -DHAVE_CONFIG_H -Wall -W -Wno-unused-parameter  -c rsync.c -o rsync.o
> In file included from ./rounding.c:20:0:
> ./rsync.h:1006:19: fatal error: proto.h: No such file or directory
>  #include "proto.h"
>                    ^
> compilation terminated.
> Failed to create rounding.h!
> make: *** [rounding.h] Error 1
> make: *** Waiting for unfinished jobs....

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