Just a quick comment on this.
I looked at the implementation and it seems like a different name
would suit this function - e.g. writefile. It basically writes text
from it's arguments out to a file.
The idea of a function called withfile seems hard to actually
implement - I'm not sure how one might even do it. It would be like a
special kind of $(eval), I think. The output file would be open while
the contents were being evaluated and closed when they finished.
Within this evaluation, any calls to $(write filehandle,) would
happen to the file. I think this is a pretty hard thing to do and
although I love the (to me) elegance of it, it's a bit harder to
implement and the function you have provided is more than good enough
for the situations that I've needed so far.
I think that a withfile would come into it's own when you could put
it around a giant makefile:
$(withffile fh,log.out,
include hugemakefile.mk
)
Since you would open and close the file only once rather than
repeatedly and this might be a good thing for parse speed.
But I suspect that this form could have performance, memory etc
implications that might be undesirable because of the need to load and
store a complete copy of the makefile in memory and then evaluate it.
Perhaps I will get a chance to submit some actual code one day when I
can sort out open source contributions with my employer.
In the meantime:
$(writefile filename,value)
$(appendfile filename,value)
would probably be quite nice and they don't absolutely demand that one
use the C library mode flags (w,w+,a etc). This is one thing that
Paul didn't like from the previous suggestions.
Regards,
Tim
On 15 December 2011 23:13, Lawrence Ibarria libar...@nvidia.com wrote:
This is a rather simple path that implements a very simplified version of
what Tim suggested in his message of Sept 25th
(https://lists.gnu.org/archive/html/bug-make/2011-09/msg00044.html ).
Paul, what do you think? I’d rather not try to do everything, just focus on
one thing. I am not sure how much safety checks play a role inside make.
-- Lawrence
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