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
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