[Bug 65161] New: Issues in parallel builds due to multiple targets rule in a makefile

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=65161

            Bug ID: 65161
           Summary: Issues in parallel builds due to multiple targets rule
                    in a makefile
           Product: Apache httpd-2
           Version: 2.4.46
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Build
          Assignee: bugs@httpd.apache.org
          Reporter: borysp@invisiblethingslab.com
  Target Milestone: ---

Inside server/Makefile.in there is a rule:

util_expr_scan.c util_expr_parse.c util_expr_parse.h: util_expr_scan.l
util_expr_parse.y

It generates those 3 files at once (in one run of the rule). This should be
expressed as grouped targets (&:, available in Make 4.3 or later) or using
intermediate target, so that make is aware that each run always generates all
of these targets.
Currently, when we run a parallel build, this rule might be execute more than
one time and, if such two runs happen at the same time, it might break the
generated files.

There is a comment above this rule: "we really don't expect end users to use
these targets!", so this might be the issue, as this rule is ran in a normal
build.

I'm building the 2.4.46 version using:
./configure --prefix=$(abspath $(INSTALL_DIR)) --with-mpm=prefork
--enable-mpms-shared='prefork worker event' --enable-ssl
make -j8

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