Description

Currently, an undefined environmental variable with #!defenv results in Kamailio failing to start. The proposal here that if the environmental variable is not defined, then the macro value would be undefined as well. For example:

!#KAMAILIO
loadmodule "xlog"
loadmodule "pv"

#!defenv FOO

request_route {
    #!ifdef FOO
        xlog("L_INFO","Environmental variable $$FOO is set\n");
    #!else
        xlog("L_WARN","Environmental variable $$FOO is NOT set\n");
    #!endif
    forward();
}

Currently this configuration will fail to load if environmental variable is not set. My proposal is to either allow #!envdef to accept an undefined environmental variable and have the preprocessor macro undefined, or to add a new keyword (#!envdefn perhaps?) to allow this behavior.

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