[Octave-bug-tracker] [bug #46964] Build error with parallel builds

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?46964>

                 Summary: Build error with parallel builds
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 24 Jan 2016 11:48:59 PM UTC
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Building Octave with "make -j4 all" or "make -j8 all" on 64-bit Ubuntu has
recently started giving the following error:


  GEN    c++defs.h
  GEN    warn-on-use.h
  GEN    unused-parameter.h
  GEN    stdalign.h
mv: cannot stat `c++defs.h-t': No such file or directory
make[2]: *** [c++defs.h] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [check-recursive] Error 1


Occasionally it's a different "header.h-t" inside libgnu.

BUT: the rest of the build proceeds normally until it freezes at the end.
Killing "make" and rerunning the command with no changes now builds Octave on
the second attempt.

This problem does not arise with "make -j1 all" or simply "make all" but that
takes 4-8 times as long.

It looks like the "header.h-t" files are used by libgnu/Makefile only as temp
files during the build. Are these necessary?




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