Re: Requiring environment variables

[Mike Shal]

On 1/28/08, Yang Zhang <address@hidden> wrote:
> Does make have an equivalent to bash's `nounset`? This exits immediately
> with error if a variable or environment variable is unset. Thanks in
> advance.

I don't think there is a single specific command to do what you want,
but you can implement it like so:

ifeq ($(origin REQUIRED_VAR),undefined)
   $(error REQUIRED_VAR is not set)
endif

You can read about the $(origin) command in the make manual to see if
you want to do something fancier than just check for 'undefined'.

-Mike