[bug #26893] parallel build randomly skips intermediate prerequesites

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?26893>

                 Summary: parallel build randomly skips intermediate
prerequesites
                 Project: make
            Submitted by: None
            Submitted on: Fr 26 Jun 2009 07:03:10 UTC
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.81
        Operating System: POSIX-Based
           Fixed Release: None

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Details:

I experience failues with parallel make on my dual-core laptop machine
(GNU/Linux, x86-64).
I faintly remember something similar on Solaris/x86-64 on a 16-core box, but
I dismissed it as artefact of the not well-synched clocks we have there
between NFS filesystems.
I'll try to check this.

Anyway, problem is:

I have a Fortran 90/95 project that contains .F90 files that need
preprocessing to .f90 before being compiled to .o .
Excerpt from the Makefile (I'll attach it, it is not that big):

.SUFFIXES:
.SUFFIXES: .F90 .f90 .o

%.bin: %.o
        $(LINK) -o $@ $(shell perl f90dep.pl link "$<") $(LIBS)

.F90.f90:
        $(PREPROCESS) $< > $@

.f90.o:
        $(COMPILE) -c -o $@ $<


I also have Makefile snippets that contain dependency information in .deps/
(they are auto-generated by the Makefile, but already up to date for the
situation at hand).

Now, when I build a set of targets (final .bin programs), one intermediate
.f90 file may not be generated and the build fails on the subsequent .o file,
when running make with -j5 (could not reproduce with -j2 now).
This occurs with some randomness, sometimes the build works, sometimes not.

Single make is always fine, so I assume I got the rules and dependencies
right. I hope the to-be-attached logs shed some light on this. Parallel make
prunes misc/multiindex.f90 while single make builds it...




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File Attachments:


-------------------------------------------------------
Date: Fr 26 Jun 2009 07:03:11 UTC  Name: make.log  Size: 269kB   By: None
Makefile and logs for single and parallel build, make clean has been executed
before each build.
<http://savannah.gnu.org/bugs/download.php?file_id=18327>
-------------------------------------------------------
Date: Fr 26 Jun 2009 07:03:11 UTC  Name: make-single.log  Size: 210kB   By:
None
Makefile and logs for single and parallel build, make clean has been executed
before each build.
<http://savannah.gnu.org/bugs/download.php?file_id=18328>
-------------------------------------------------------
Date: Fr 26 Jun 2009 07:03:10 UTC  Name: Makefile  Size: 1kB   By: None
Makefile and logs for single and parallel build, make clean has been executed
before each build.
<http://savannah.gnu.org/bugs/download.php?file_id=18326>

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