"Doctor, when I poke my eye like this it hurts"
-"So don't do that then"
If you run the Git Makefile (with GNU Make 3.81) in parallel for long
enough you'll get some interesting breakages. Those interested in
poking their eyes can try:
while nice -n 30 make -j 15 clean all CFLAGS=-O0 CC=gcc; do 1; done
These suggest that we have some bugs in our Makefile dependencies, but
since I haven't found what they are I'm just going to post the
symptoms.
The first example is the generation of the perl.mak from the
top-level. It seems that if you run make with -j $n the perl.mak will
get generated $n times:
LINK git-fast-import
Writing perl.mak for Git
Writing perl.mak for Git
Writing perl.mak for Git
Writing perl.mak for Git
LINK git-imap-send
Writing perl.mak for Git
LINK git-shell
LINK git-show-index
LINK git-upload-pack
Writing perl.mak for Git
[...]
This can lead to an error where they trip over each other:
Writing perl.mak for Git
Writing perl.mak for Git
AR libgit.a
AR xdiff/lib.a
LINK git-fast-import
LINK git-imap-send
Writing perl.mak for Git
Writing perl.mak for Git
rename MakeMaker.tmp => perl.mak: No such file or directory at
/usr/share/perl/5.10/ExtUtils/MakeMaker.pm line 1004.
make[2]: perl.mak: No such file or directory
make[2]: *** No rule to make target `perl.mak'. Stop.
make[1]: *** [instlibdir] Error 2
make: *** [git-svn] Error 2
make: *** Waiting for unfinished jobs....
make[2]: perl.mak: No such file or directory
make[2]: *** No rule to make target `perl.mak'. Stop.
make[1]: *** [instlibdir] Error 2
make: *** [git-relink] Error 2
Writing perl.mak for Git
Writing perl.mak for Git
Writing perl.mak for Git
Writing perl.mak for Git
Writing perl.mak for Git
Here one make job seemingly had its MakeMaker.tmp file usurped by
another job.
Here's another one, it seems that the builtin/help.o dependency on
common-cmds.h is broken:
CC builtin/help.o
[...]
CC builtin/ls-remote.o
builtin/help.c:9:25: error: common-cmds.h: No such file or directory
builtin/help.c: In function ‘list_common_cmds_help’:
builtin/help.c:278: error: ‘common_cmds’ undeclared (first use in
this function)
builtin/help.c:278: error: (Each undeclared identifier is reported only once
builtin/help.c:278: error: for each function it appears in.)
Which is odd, because this seems OK:
builtin/help.o: common-cmds.h
builtin/help.s builtin/help.o: EXTRA_CPPFLAGS = \
'-DGIT_HTML_PATH="$(htmldir_SQ)"' \
'-DGIT_MAN_PATH="$(mandir_SQ)"' \
'-DGIT_INFO_PATH="$(infodir_SQ)"'
A vaguely recall having run into some other make error, but I can't
reproduce it now. I'll keep poking my eye and reporting results to the
list.
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