On Tue, 09 Nov 2010 10:24:11 -0500 Paul Smith <psm...@gnu.org> wrote:
> On Tue, 2010-11-09 at 15:47 +0100, Rafaël Carré wrote: > > Hello, > > > > I believe I've found a bug in make 3.81, or at least some confusing > > behaviour. > > > > Here is a comparison of GNU make and netbsd 'pmake' > > > > A-$(X) isn't expanded to "A-1" because of the comment on the line > > where X is set, although X is set to "1" > > X is not set to "1". It's set to "1 " (note trailing space). This is > documented and required by the POSIX standard: trailing whitespace on > a variable assignment is preserved. Thanks for the explanation > > % cat Makefile > > X = 1 #comment > > Y = 1 > > A-$(X) = a > > B-$(Y) = b > > > > all: > > @echo $(X) $(A-1) > > @echo $(Y) $(B-1) > > It's a hugely bad idea to use simple "echo" when trying to see values, > because the shell will eat whitespace differences. You should quote > the values and add characters before and after, like this: > > all: > @echo '|$(X)| |$(A-1)|' > @echo '|$(Y)| |$(B-1)|' > > then you will immediately see the difference. Ok, i'll remember to use this -- ✍ Rafaël Carré ☺
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