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From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-10-07 14:34:15

On Saturday 07 October 2006 20:46, K. Noel Belcourt wrote:
> I've noticed some inconsistent behavior with the build system that I
> want to show you. Our nightly regression builds some 30+
> applications from some 100+ libraries and most nights a couple of
> source files fails to produce an object file even though there's no
> error message indicating problems. Note that we're writing to a
> local disk (not NFS mounted) although we do read from NFS. From our
> build log, we've found that bjam queues up a source file to compile
> it, but there is no error message in the log file and no object file
> is produced.
> Note that if I just reissue the build command, these two files
> compile fine, the library links and the executables link without
> problem. I can envision build system and disk failures. We've
> scanned the disk we're writing to and found no problems. The problem
> surfaces randomly, some nights there's no failures with any toolset,
> other nights, small numbers of files (1-5) fail for an irreproducible
> reason.
> Any ideas?

Is any -j option involved? I recall there was a bug where bjam would not even
run a command for a file.

However, you say that the command is issued, but does not produce a file, so
it looks like a different problem.

First step is to verify that bjam invokes the g++ command. Try running
with -d+2 to show the command, just in case it will give a clue. Try to write
a script called "g++" that forwards to real g++ but stores the command to a
log files. If the real g++ is actually run but produces nothing, it's some
g++/os issue.

Try making a wrapper script over g++ that run gcc as:

   strace -o unique-log-file -f g++ .......

The script should also look at the value of the -o option from g++ invocation
and check if the file is created when zero error status is returned by g++.
In such case, the log file produce by strace can be examined for any os-level

One idea I have is that g++ dies with out-of-memory error, or some filesystem
error, but zero status is somehow returned to bjam.

- Volodya

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