Why sometimes @ prefix fails to suppress command echo?

[Chen Jun (陈军)]

 

Hello, help-make

 

　　I'd like to tell a strange behavior of make.

 

For GNU make 3.81 & 3.80. Can someone tell me why the running output from 'all' and 'all2' are different?

 

ifeq ($(SHOW_CMD),1)
  Q =
else
  Q = @
endif

define _DO_LINK
 echo "smash it."
 echo "smash done."
endef

all: 
 $(if $(SHOW_CMD),,@)$(_DO_LINK)

all2:
 @$(_DO_LINK)
{code}

 

Output:

 

$ make -f sn.mk
smash it.
echo "smash done."
smash done.

$ make all2 -f sn.mk
smash it.
smash done.

 

For target 'all', the @ suppress only the first command in $(_DO_LINK). Can this be make's bug?

 

 

 

 Best Regards

 　　　　　　          Chen Jun (陈军)
                       address@hidden

                       2007-11-05