[Bug general/5183] broken build with -j>1

["pmachata at redhat dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From pmachata at redhat dot com  2007-10-16 12:54 -------
The problem seems to be with two .g.antlered implicit rules being run in
parallel, which step on each other's .antlr-fixes temporary files.  In this
particular case, this is caused by missing rule:
frysk/expr/CExprEvaluator.antlered: frysk/expr/Completer.antlered

Makefile rules are generated from importVocab directives in .g files by way of
Makefile.gen.sh, so frysk really tries to give make proper parallelization
hints.  So the real problem is with temporary file handling.

I believe what happens is that antlr-warnings.awk produces  e.g.
CExprEvaluator.antlr-fixes, when suddently the other make invocation removes it
via 'rm -f $$d/*.antlr-fixes'.  So the file being just built is removed, and
misses its beginning.  Later on, there's 'for fix in $$d/*.antlr-fixes', which
picks both files, the "healthy" one as well as the truncated one, and tries to
use them as a sed source.  For that reason both parallel make branches fail.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5183

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.