On Tue, Jun 09, 2020 at 09:36:43AM -0700, David Boyce wrote:
> On Tue, Jun 9, 2020 at 9:21 AM Dmitry Goncharov
> wrote:
> > You mean for target specific simple variable memory is allocated and
> > the variable is initialized only if the target is built, right?
> Yes, that's the suggestion I was
Yes, that's the suggestion I was making though I don't know the innards of
make well enough to know how hard it would be.
David
On Tue, Jun 9, 2020 at 9:21 AM Dmitry Goncharov
wrote:
> On Tue, Jun 9, 2020 at 12:01 PM David Boyce
> wrote:
> > When I say "needed" here I mean specifically that
On Tue, Jun 9, 2020 at 12:01 PM David Boyce wrote:
> When I say "needed" here I mean specifically that the recipe runs. Clearly a
> target-specific variable is 'needed' iff the target is built. It's not a
> question of how many places the variable is expanded, it's a boolean thing:
> the
On Tue, Jun 9, 2020 at 9:46 AM Edward Welbourne wrote:
> I presume the workaround is
>
> TGTDATE := $(shell date)
> $(TARGETS): DATE := $(TGTDATE)
>
> at the slightly annoying price of calling the command once even if
> making some target *not* in the TARGETS list.
It is possible to avoid this
I think you misunderstood the point of my message. The date doesn't matter
here, it was just a random command in a demo makefile. In fact the command
was originally "hostname" but I was concerned about leaking even the
smallest amount of internal data about my workplace so I figured "date" was
On Tue, Jun 9, 2020 at 9:10 AM David Boyce wrote:
> TARGETS := aa bb cc dd
> $(TARGETS): at := $(shell set -x; date)
Despite the same name "at" those are different variables.
Given that there are 4 simple variables defined, 4 calls to date take place.
$ cat makefile
.PHONY: all
all: aa bb
aa:
David Boyce (9 June 2020 15:10_
> I'm not saying this should be considered a bug but it's at least an
> "interesting result".
Indeed !
I presume the workaround is
TGTDATE := $(shell date)
$(TARGETS): DATE := $(TGTDATE)
at the slightly annoying price of calling the command once even if
making
I'm not saying this should be considered a bug but it's at least an
"interesting result". I've always followed the rule of thumb that simple
(:=) assignment should be used when the RHS contains $(shell ), and
this is still a good mnemonic 99.9% of the time, but I've run across a case
where it
