Exported vs command line variables

[Pietro]

Hi,

I have noticed that there is a difference between the two scenarios
listed below:

i) make  CC=arm-linux-gnueabihf-gcc CPPFLAGS=[..]

ii) export CPPFLAGS=[..] [RET]
    make CC=arm-linux-gnueabihf-gcc


I have read over internet that the latter is used when appending
instead of replacing/setting the variable's value.

What is exactly the difference ? Is there a page in the Make manual
explaining that ?


Thanks a lot,
P.