[bug #30328] Fast echo (with code proposal)

[Olexiy Buyanskyy]

Follow-up Comment #2, bug #30328 (project make):

I am not sure if we really need echo, but it will be good to have command to
output make variables to file. 
Because of shell limitation that is very expensive with echo.

#performance is awful here!!!
all: $(thousands_of_target_files)
  $(foreach file,$^,echo $file >> list.all.targets)

I think that is very good to have additional parameter for existing $(info)
function.

#This should work much faster
all: $(thousands_of_target_files)
  $(info $^,list.all.targets)

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