R. David Murray wrote:
> 
> R. David Murray <rdmurray@bitdance.com> added the comment:
> 
> Hmm.  Some at least of the buildbots have failed to build after that patch:
> 
> ./python ./Python/freeze_importlib.py \
>     ./Lib/importlib/_bootstrap.py Python/importlib.h
> make: ./python: Command not found
> make: *** [Python/importlib.h] Error 127
> program finished with exit code 2
> 
> (http://www.python.org/dev/buildbot/all/builders/AMD64%20Gentoo%20Wide%203.x/builds/3771)

Thanks for mentioning this. I've reverted the change for now and
will have a look tomorrow.

The logs of the failing bots are not very informative about what
is going on:

gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/dynamic_annotations.o Python/dynamic_annotations.c
gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/errors.o Python/errors.c
./python ./Python/freeze_importlib.py \
    ./Lib/importlib/_bootstrap.py Python/importlib.h
make: ./python: Command not found
make: *** [Python/importlib.h] Error 127
program finished with exit code 2

vs.

gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/dynamic_annotations.o Python/dynamic_annotations.c
gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/errors.o Python/errors.c
gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/frozen.o Python/frozen.c
gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/frozenmain.o Python/frozenmain.c
gcc -pthread -c -Wno-unused-result -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include
-DPy_BUILD_CORE -o Python/future.o Python/future.c

I guess some commands are not printed to stdout.

Looking at the buildbots again: reverting the patch has not caused
the lights to go green again. Very strange indeed.

Looking further I found this line in the Makefile:

############################################################################
# Importlib

Python/importlib.h: $(srcdir)/Lib/importlib/_bootstrap.py $(srcdir)/Python/freeze_importlib.py
        ./$(BUILDPYTHON) $(srcdir)/Python/freeze_importlib.py \
            $(srcdir)/Lib/importlib/_bootstrap.py Python/importlib.h

Since the patch modified _bootstrap.py, make wants to recreate importlib.h,
but at that time $(BUILDPYTHON) doesn't yet exist.