I was not aware of the internal variable. What I discovered so far:
```
txt@txt:/media/ssd/lede$ grep --no-message -R HOSTCPPFLAGS ./
./include/u-boot.mk:HOSTCFLAGS='$(HOST_CFLAGS) (HOSTCPPFLAGS)' \
txt@txt:/media/ssd/lede$ grep --no-message -R HOST_CPPFLAGS ./
./package/devel/strace/Makefi
On 2017-06-14 02:16, Matthias Fritzsche wrote:
> * On other places the variable is written with an underscore.
> * With one $ sign it treats it as variable. With the former
> four signs it tried to execute a command with this name.
>
> Signed-off-by: Matthias Fritzsche
> ---
> include/u-boot.m
