Hi everyone! I 'm here again.
Recently I 'm trying to understand the C code with output-debug method,
inserting many print statements. I was doing well with it until one day: I
changed a file called loops_utils.h.src located in numpy/core/src/umath by
inserting some "printf", but after I re-built the Numpy from source, the
changes didn't apply.
Specifically, I added:
printf(" ??????? ");
in line 80, but after re-building it didn't output "??????".
I found that when I ran "python setup.py build_ext --inplace", the output
info seemed to tell me that nothing has been compiled, because normally
when something changed, it will output:
> x86-64-conda-linux-gnu-cc: xxxxxx.dispatch.c
What's more interesting is that: after I changed the file
loops_arithm_fp.dispatch.c.src, and then rebuilt, the change to
loops_utils.h.src applied, with the screen full of "??????".
I tested it for many times that each time I modify loops_utils.h.src, and
the change doesn't apply after re-building; while after I
modify loops_arithm_fp.dispatch.c.src, the change to loops_utils.h.src
starts to apply.
It seems to be related to how build system detects the change, I guuess.
Can someone explain why this will happen or point out what I 've missed?
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