Hello,
Some behaviour of make (version 3.79) seems very strange to me. Some files
that are generated during a make command are deleted after the command
completes if these generated files did not exist before.
A small example project is in the tar file. The strange behaviour can be
produced like this (after unpacking into an empty directory):
rm -rf .deps/ *prep* *o
no output.
make
output:
> echo "/* cpp */" > test.prep.cpp
> echo "/* h */" > test.prep.h
> [ -d .deps ] || mkdir .deps
> echo -n ".deps/test.d " > .deps/test.d
> g++ -M -I. test.cpp >> .deps/test.d
> mv -f .deps/test.d .deps/test.D
> echo timestamp > .deps/test.d
> g++ -I. -c test.cpp -o test.o
> rm test.prep.cpp .deps/test.d
The last line is the problem!
make
output:
> echo "/* cpp */" > test.prep.cpp
> echo "/* h */" > test.prep.h
> [ -d .deps ] || mkdir .deps
> echo -n ".deps/test.d " > .deps/test.d
> g++ -M -I. test.cpp >> .deps/test.d
> mv -f .deps/test.d .deps/test.D
> echo timestamp > .deps/test.d
> g++ -I. -c test.cpp -o test.o
I can see the no reason why the two files `test.prep.cpp' and
`.deps/test.d' should be removed. I do neither find an implicit rule for
this nor does my Makefile even contain `rm'. I think that it would be a
bad thing if make starts removing files without being asked to do that.
I would very much appreciate if somebody could explain this, if it is no
bug.
Thanks,
Alexander Bürger
example project
