URL:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=16138>
Summary: multiple jobservers started up by parallel make
(and so uses 4 FDs instead of just 2)
Project: make
Submitted by: None
Submitted on: Mon 03/20/06 at 21:58
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Component Version: 3.79.1
Platform Version: POSIX-Based
Fixed Release: None
_______________________________________________________
Details:
The command 'make test' with the following makefile fails when trying to
process the 'submake' target in the 2nd makefile (makefile2) because file
descriptor 5 is being used by the parallel make jobserver. If you then do
another 'make test', it works because 'dependfile' exists. It seems that
when make is making the 'dependfile' so it can do the 'include dependfile' it
starts up a jobserver (using FD 3,4) and then when it processes the 'submake'
target, it does not know about the first jobserver and so starts up another
jobserver (using FD 5,6).
Running on a Linux machine where uname -a returns:
Linux lnxmach1 2.4.21-20.ELsmp #1 SMP Wed Aug 18 20:46:40 EDT 2004 i686 i686
i386 GNU/Linux
makefile
--------
test:
@echo MAKE=$(MAKE) MAKEFLAGS=$(MAKEFLAGS)MFLAGS=$(MFLAGS)
$(MAKE) -f makefile2 -j 2 submake
makefile2
---------
dependfile:
@echo SOMEMACRO=joe > $@
@echo MAKE=$(MAKE) MAKEFLAGS=$(MAKEFLAGS)MFLAGS=$(MFLAGS)
include dependfile
submake:
@echo MAKE=$(MAKE) MAKEFLAGS=$(MAKEFLAGS)MFLAGS=$(MFLAGS)
$(MAKE) -f makefile2 fdprint 5>output
fdprint:
@echo MAKE=$(MAKE) MAKEFLAGS=$(MAKEFLAGS)MFLAGS=$(MFLAGS)
@echo hi >&5
_______________________________________________________
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