[Issue 14811] allow to exclude current directory from search path in dmd

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14811

--- Comment #5 from Timothee Cour <timothee.cour2 at gmail.com> ---
>> Why you cannot do that from the project root directory?

There's not always an obvious project root directory, eg when using submodules
or several outside packages. 

>> The feature explanation does not argue the necessity of the enhancement. Please show to us the situation where the feature is necessary.

* I'm not the only one wanting this:
http://forum.dlang.org/post/mlqdzpswbwqyrwiibqwg@forum.dlang.org

* It exists in c++
http://stackoverflow.com/questions/12353429/prevent-gcc-from-searching-the-current-dir-i-option-on-include-search-path

* if the 'natural' working directory is foo/ (current directory, where user
edits files etc), wrapping every dmd invocation with 
'cd root && dmd some_command  && cd -'
is inconvenient. Eg, the error messages will be wrt to root, not wrt user's
current directory

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