[Scons-users] Why is File() changing the path I give it?

[Luke Robison]

I realize that the result of the File() constructor is an object, not just
a string.  What I was attempting to point out was my surprise at the
behavior of the constructor.  I was operating under The Principle of Least
Surprise, and changing a fully-resolved file path to a new file path
surprised me.  Less surprising outcomes would have been a "No rule to build
file XXX" error, or perhaps a "you can't make a Node.FS object from a file
which doesn't yet exist".  I found the behavior quite confusing.

On Thu, Apr 23, 2020 at 1:58 PM Bill Deegan <bill at baddogconsulting.com>
wrote:

> File() creates a node in SCons's datastructures.
> It does not create a string to hold the representation of that file you
> passed to File().
>
> SCons has a canonical representation of files and also how to generate
> strings from that representation.
>
> Does that help?
>
> On Fri, Apr 17, 2020 at 1:20 PM Luke Robison <lukerobison at gmail.com>
> wrote:
>
>> I'm trying to explicitly add dependencies to an scons build with multiple
>> subdirectories and variant_dir builds.  My custom add dependency function
>> goes something like this (trying to make my build_tgt depend on lib.
>> built_libname = env['LIBPREFIX'] + lib + env['LIBSUFFIX']
>>             full_name = env.Literal("{}/{}/build-{}/{}".format(env.Dir(
>> '#').abspath,lib,self.short_flavor(env),built_libname))
>>
>> # full_name is like "/c/robison/code/xorshift/build-gd/libxorshift.a"
>>             build_dep = env.File(full_name)
>>
>> # build_dep is like "/c/robison/code/xorshift/source/libxorshift.a"
>>             env.Depends( build_tgt, build_dep )
>>
>> But I am completely confused as to why the File() function changing the
>> path out from under me (see the inline comments).  It seems to be replacing
>> a variant_dir with "source" when the explicitly given path does not exist
>> (which is often the case on a fresh build)
>>
>> For some context, my Sconstruct is at code/, and my Sconscript files are
>> in code/<library>/source/Sconscript
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