Hi, I happen to find an odd problem when I am experiment with gnu
make. And I have written a really simple makefile to test how make
work when chaining rules together to generate the target.
My makefile is somewhat look like this:
#makefile
pro: ok.h pro.c
%:%.c
%.c:
@echo generate $@
%.h:
@echo generate $@
%.l:
@echo use %.l rule and generate $@
#%:%.o
# @echo $+
%:%.l pro.c
@echo use .l rule and generate $@
There is only a makefile in the folder. That means every file
indicated in this makefile are not really exist. I just what to test
how make work.
But when I run make in my bash shell's command line, make output an
odd result(I found it odd at least). The make program output:
generate pro.c
use %.l rule and generate makefile.l
use .l rule and generate makefile
generate ok.h
use %.l rule and generate pro.l
use .l rule and generate pro
I haven't specified anything that relate to the file makefile, by why
does make have to generate makefile.l and makefile? Is that an bug or
else?
Thank you very much.
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