tags 327154 +confirmed,upstream
severity 327154 minor
thanks
Hi,
Invoke make as 'FOO=shell make FOO=cmdln' for the following
Makefile.
--8<---------------cut here---------------start------------->8---
all:
@echo Foo is $(FOO),$(shell echo $(FOO)),$$FOO,$(shell echo $$FOO)
--8<---------------cut here---------------end--------------->8---
You can easily see that $(shell) doesn't have the same
environment as a sub-process.
As is explained in
http://www.cmcrossroads.com/content/view/7657/268/ , this is bug
https://savannah.gnu.org/bugs/?10593. Part of the reason this hasn't
been fixed is that the obvious solution ('just do whatever you do for a
rule') has a rather nasty consequence. Suppose, I do the following:
export FOO=$(shell echo fooey)
all:
@echo FOO is $$FOO
What's the value of FOO in the rule for all? In order to get the value
of FOO in the environment for all it has to be expanded which results in
a loop as FOO would have to be placed in the environment of the $(shell)
which requires getting the value of FOO and so on...
GNU Make's developers opted for an easy way: they just don't even try to
fix the bug (for the moment).
manoj
--
Genius is one percent inspiration and ninety-nine percent
perspiration. Thomas Alva Edison
Manoj Srivastava <[EMAIL PROTECTED]> <http://www.debian.org/~srivasta/>
1024D/BF24424C print 4966 F272 D093 B493 410B 924B 21BA DABB BF24 424C
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