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: [email protected]
Reporter: [email protected]
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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