Your message dated Sun, 21 Jun 2009 17:04:06 +0000
with message-id <[email protected]>
and subject line [bug #26864] make -j2 fails to rebuild intermediate file
has caused the Debian Bug report #530855,
regarding make -j2 fails to rebuild intermediate file
to be marked as done.
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--
530855: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=530855
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: make
Version: 3.81-5
Severity: normal
I stumbled on a problem with make -j2. Here is how to reproduce the problem:
# First create some files:
cat >Makefile <<"EOF"
ALL=foo bar and much more
build-%/lib.so: build-%/rsrc.res build-%/main.o
cat $^ >$@ || rm $@
# .SECONDARY: $(ALL:%=build-%/rsrc.res)
.SUFFIXES: .rc .res
.rc.res:
cat $< >$@ || rm $@
$(ALL:%=build-%/rsrc.rc): rsrc.rc.in
mkdir -p `dirname $...@`
cat $< >$@ || rm $@
$(ALL:%=build-%/main.o): main.c
mkdir -p `dirname $...@`
cat $< >$@ || rm $@
EOF
echo foo >main.c
echo bar >rsrc.rc.in
# But note that the copy/paste may have messed up the tabs in the Makefile.
# Then do a normal build
make -j2 build-foo/lib.so
mkdir -p `dirname build-foo/rsrc.rc`
mkdir -p `dirname build-foo/main.o`
cat rsrc.rc.in >build-foo/rsrc.rc || rm build-foo/rsrc.rc
cat main.c >build-foo/main.o || rm build-foo/main.o
cat build-foo/rsrc.rc >build-foo/rsrc.res || rm build-foo/rsrc.res
cat build-foo/rsrc.res build-foo/main.o >build-foo/lib.so || rm build-foo/lib.so
rm build-foo/rsrc.res
# All good, now trigger a rebuild
touch main.c
make -j2 build-foo/lib.so
mkdir -p `dirname build-foo/main.o`
cat main.c >build-foo/main.o || rm build-foo/main.o
cat build-foo/rsrc.res build-foo/main.o >build-foo/lib.so || rm build-foo/lib.so
cat: build-foo/rsrc.res: Aucun fichier ou dossier de ce type
# -> make forgot to rebuild the build-foo/rsrc.res intermediate file!
# Let's try again
make -j2 build-foo/lib.so
cat build-foo/rsrc.rc >build-foo/rsrc.res || rm build-foo/rsrc.res
cat build-foo/rsrc.res build-foo/main.o >build-foo/lib.so || rm build-foo/lib.so
rm build-foo/rsrc.res
# -> Now that there was only the intermediate file to rebuild it worked fine.
# Let's try again without the -j2
touch main.c
make build-foo/lib.so
mkdir -p `dirname build-foo/main.o`
cat main.c >build-foo/main.o || rm build-foo/main.o
cat build-foo/rsrc.rc >build-foo/rsrc.res || rm build-foo/rsrc.res
cat build-foo/rsrc.res build-foo/main.o >build-foo/lib.so || rm build-foo/lib.so
rm build-foo/rsrc.res
# -> Works fine for non parallel builds
So there are two workarounds:
* Disable parallel builds
* Declare the rsrc.res intermediate file as .SECONDARY so that it's not
necessary to rebuild it in the first place.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.25.3fg1 (PREEMPT)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages make depends on:
ii libc6 2.9-4 GNU C Library: Shared libraries
make recommends no packages.
Versions of packages make suggests:
ii make-doc 3.81-4 Documentation for the GNU version
-- no debconf information
--- End Message ---
--- Begin Message ---
URL:
<http://savannah.gnu.org/bugs/?26864>
Summary: make -j2 fails to rebuild intermediate file
Project: make
Submitted by: srivasta
Submitted on: Sun 21 Jun 2009 12:04:03 PM CDT
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: POSIX-Based
Fixed Release: None
_______________________________________________________
Details:
This was reported by a Debian user. Here is how to reproduce the
problem:
cat >Makefile <<"EOF"
# .bar files depend on .c files as well as foo.h
%.bar: %.c foo.h
cat $^ >$@ || rm $@
# foo.h is created from foo.in
foo.h: foo.h.in
cat $^ >$@ || rm $@
# main.c should be created from main.y below
EOF
cat >main.y <"EOF"
%%
command:
"q" { return 1; }
;
%%
EOF
echo bar >foo.h.in
# The initial build is fine
make -j2 main.bar
cat foo.h.in >foo.h || rm foo.h
yacc main.y
mv -f y.tab.c main.c
cat main.c foo.h >main.bar || rm main.bar
rm main.c
# But touch foo.h.in and things go wrong
touch foo.h.in
make -j2 main.bar
cat foo.h.in >foo.h || rm foo.h
cat main.c foo.h >main.bar || rm main.bar
cat: main.c: No such file or directory
# Here 'make -j2' decides to rebuild main.bar without first
# recreating main.c although we explicitly stated that main.bar
# depends on main.c. Here is what that command says with -d:
Considering target file `main.bar'.
Considering target file `main.y'. <--- Should be main.c
File `main.y' was considered already.
Considering target file `foo.h'.
File `foo.h' was considered already.
Pruning file `main.c'. <--- ???
Finished prerequisites of target file `main.bar'.
Prerequisite `main.c' of target `main.bar' does not exist. <--- !!!
Prerequisite `foo.h' is newer than target `main.bar'.
Must remake target `main.bar'.
cat main.c foo.h >main.bar || rm main.bar
cat: main.c: No such file or directory <--- Doh!
# The next attempt works though (but this time make does not
# have to rebuild foo.h)
make -j2 main.bar
yacc main.y
mv -f y.tab.c main.c
cat main.c foo.h >main.bar || rm main.bar
rm main.c
# Compare this with 'make -j1'
touch foo.h.in
make -j1 main.bar
cat foo.h.in >foo.h || rm foo.h
yacc main.y
mv -f y.tab.c main.c
cat main.c foo.h >main.bar || rm main.bar
rm main.c
# Here make correctly realizes it must rebuild main.c before attempting
# to run the command to generate main.bar. And the corresponding make
# -d output:
Prerequisite `foo.h.in' is newer than target `foo.h'.
Must remake target `foo.h'.
cat foo.h.in >foo.h || rm foo.h
Successfully remade target file `foo.h'.
Considering target file `main.c'. <--- Correct target
File `main.c' does not exist.
Pruning file `main.y'.
Finished prerequisites of target file `main.c'.
Must remake target `main.c'. <--- Yes!
yacc main.y
mv -f y.tab.c main.c
Must remake target `main.bar'.
cat main.c foo.h >main.bar || rm main.bar
Successfully remade target file `main.bar'.
Removing intermediate files...
rm main.c
It looks like make -j2 swapped main.c and main.y
I can't get around the fact that there is a reproducible
difference based on whether or not the -j2 argument was give,
manoj
_______________________________________________________
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