where is wrong about eval-ing the results of the function call?

[Pan ruochen]

Hi All,

Here is my Makefile script
------------------------------------------------------
my_src_dir := dir_a dir_b

define dir-to-vpath
#X
vpath %c $1
vpath %S $1
#Z
endef

ifdef my_src_dir
cmd = $(foreach dir,$(my_src_dir),$(call dir-to-vpath,$(dir)))
$(warning $(cmd))
$(eval $(cmd))
endif

all: 1.c 2.c 3.S
------------------------------------------------------
$make -f z.mak
z.mak:11: #X
vpath %c dir_a
vpath %S dir_a
#Z #X
vpath %c dir_b
vpath %S dir_b
#Z
z.mak:12: *** missing `endif'.  Stop.

I can't see how `endif` is missed. Anybody can help me?
BTW, are there options to force `make' to output variable expansions
and eval commands to stdout device
after it read Makefile, so that I can do some analysis and locate
where is wrong?

Best Regards
-------------------------
PRC
Oct 17, 2008