[erlang-questions] -include with define macro

Richard Carlsson <>
Mon Sep 21 17:36:18 CEST 2015


On Mon, Sep 21, 2015 at 1:56 PM, zxq9 <> wrote:

> On 2015年9月21日 月曜日 14:26:35 Martin Koroudjiev wrote:
> > -ifdef(CONTAINING_APP_INCLUDE).
> > -include(?CONTAINING_APP_INCLUDE).
> > -endif.
> >
> > and to compile the source files as:
> >
> > erlc -Werror -Wall -DCONTAINING_APP_INCLUDE="\"<path>/<file>.hrl\""
> > <module>.erl
> >
> > but I get the following error:
> >
> > badly formed 'include'
>
> I think includes run before macros, so your include is trying to include a
> very odd-looking thing that starts with a question-mark instead of a
> filename.
>

Not quite. The -include and -include_lib directives require that the thing
between the parentheses is a string literal, so the tokens '?'
'CONTAINING_APP_INCLUDE'
are not even subject to macro expansion in this case. (This could probably
be easily fixed, if it is important to anyone.)
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