URL:
<http://savannah.gnu.org/bugs/?25780>
Summary: .SECONDEXPANSION: of $$+ harmed by
set_file_variables() side effect
Project: make
Submitted by: None
Submitted on: Fri 06 Mar 2009 07:04:38 PM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 3.81
Operating System: Any
Fixed Release: None
_______________________________________________________
Details:
The following command line session describes and demonstrates
the issue. It is from Ubuntu x86_64, but probably the behavior
is platform-independent.
-- John Carey
> cat /etc/issue
Ubuntu 8.04.2 \n \l
> make --version
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for x86_64-pc-linux-gnu
> ls -1
Makefile.1
Makefile.2
> cat Makefile.1
# The output should have 4 "foo"s, but instead we see 3.
# It appears that second expansion calls set_file_variables()
# repeatedly for the same target, but set_file_variables()
# eliminates redundant dependencies just after computing "$+".
all : foo foo
.SECONDEXPANSION:
all : $$+ ; @echo '$+'
foo : ;
> make -f Makefile.1
foo foo foo
> cat Makefile.2
# The output should be "q1x bar bar q2x bar bar",
# but instead we see "q1x bar q2x bar".
# Once again second expansion results in multiple calls to
# set_file_variables() for the same target, with bad side effects,
# but here the effect appears to be amplified by pattern matching.
all : bar bar
bar : ;
q%x : ;
.SECONDEXPANSION:
a%l: q1x $$+ q2x ; @echo '$+'
> make -f Makefile.2
q1x bar q2x bar
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Fri 06 Mar 2009 07:04:38 PM UTC Name: Makefile.1 Size: 307B By:
None
<http://savannah.gnu.org/bugs/download.php?file_id=17602>
-------------------------------------------------------
Date: Fri 06 Mar 2009 07:04:38 PM UTC Name: Makefile.2 Size: 364B By:
None
<http://savannah.gnu.org/bugs/download.php?file_id=17603>
_______________________________________________________
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<http://savannah.gnu.org/bugs/?25780>
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