GNU Make: Add something to CXXFLAGS when invoking make

"Eric Lilja" <mindcoolergmail.com> wrote:
> $ make CXXFLAGS+='-DFRIEND
> but instead of adding -DFRIEND to CXXFLAGS, it replaced
it...

When I did some experiments with this I found the same:

-8<---------------------------
TEST += world
 
all:
        echo $(TEST)
-8<---------------------------

$ make
echo world
world
$ make TEST=hello
echo hello
hello
$ make TEST+=hello
echo hello
hello

So I had to use an extra variable:

-8<---------------------------
TEST2 += $(TEST) world

all:
	echo $(TEST2)
-8<---------------------------

$ make
echo  world
world
$ make TEST=hello
echo hello world
hello world

regards Henrik
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