Possible bug with $(eval) and :=

[Victor Shih]

I've been using this thunk implementation as described http://www.cakoose.com/wiki/gnu_make_thunks, but recently came upon an anomaly on a different operating system.  Here's an example Makefile:

A = abcdefghijklmnop

B = $(eval B := $A)$B

test:

    @echo [$B]

    @echo [$B]

On cygwin it seems to work fine:

[abcdefghijklmnopqr]

[abcdefghijklmnopqr]

But on Mac 10.6 as well as Ubuntu 12.04, it returns:

[p]

[abcdefghijklmnop]

All of these environments are running make 3.82.

The length of the definitions of A and B matter, too.  Basically the first expansion of $B truncates as many characters as the $(eval ...) definition is long.  Very strange.

Am I missing something?

-- 
Victor Shih
blog.vicshih.com