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[bug #28456] Expansion of $$< is incorrect


From: Kirill Smelkov
Subject: [bug #28456] Expansion of $$< is incorrect
Date: Wed, 10 Feb 2010 12:53:30 +0000
User-agent: Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.10 (like Gecko) (Debian)

Follow-up Comment #1, bug #28456 (project make):

I think I was also beaten by this. Consider:

---- 8< ----

$ cat bug-28456.mk 
.SUFFIXES:

all     : 1.o

show-vars = 
        $(info $$@ : $@)        
        $(info $$< : $<)        
        $(info $$^ : $^)        
        $(info $$+ : $+)        
        $(info $$? : $?)        


.SECONDEXPANSION:

%.o : %.c $$(show-vars)
        $(info --------)
        $(show-vars)
        $(CC) $(CFLAGS) -o $@ -c $<


$ touch 1.c && make -f bug-28456.mk
$@ : 1.o
$< : 1.o
$^ : 
$+ : 
$? : 
--------
$@ : 1.o
$< : 1.c
$^ : 1.c
$+ : 1.c
$? : 1.c
cc  -o 1.o -c 1.c

---- 8< ----


So as you can see $$< is wrongly second-expanded to 1.o (instead of 1.c), and
$$^, $$+, $$? are second-expanded to empty strings (instead of 1.c too).

Tested on make 3.81 and latest CVS (3.81.90; last commit on Fri Dec 11
15:55:16 2009 +0000 by eliz)


Thanks beforehand,
Kirill

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