Hello list!
I have this really large makefile and
discovered the '$(eval..)' function was handy
to use for this. Like:
define add_c_src
VPATH += $(1)
C_SRC += $(addprefix $(1)/, $(2))
$(info Number of 'C_SRC': $(words $(C_SRC)))
endef
$(eval $(call add_c_src, frmts/ceos, ceosopen.c))
$(eval $(call add_c_src, frmts/ceos2, ceos.c ceosrecipe.c ceossar.c))
# ... plus a lot more
my-target.dll: $(C_SRC:.c=.obj)
link whatever $^
----------------
But I'm curious about how this gets expanded
since the '$(info ..)' tells the length of 'C_SRC'
*before* it's used:
Number of 'C_SRC': 0
Number of 'C_SRC': 1
How does this gets expanded an executed?
The chapter "8.1 The eval function" did not make
it clear to me. But adding a:
count_C_SRC:
$(info Number of 'C_SRC': $(words $(C_SRC)))
tells me the correct number.
Another thing is that if I change to '# $(info ..',
the 'Number of ..' gets printed after all (!)
So a comment gets ignored here AFAICS.
--
--gv
