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

[Bill Deegan]

Luke,

Compiled header output of libraries?
What's that?
I don't have enough information to say for sure, but it sounds like you're
fundamentally doing something wrong.

In general (but of course not always) if you have to reach for Depends()
for a c/c++ build to make it work, you're doing something wrong.

Any chance you can provide (perhaps a github repo) of a buildable sample of
what you're trying to do?
Snippets aren't going to do it.

-Bill

On Fri, Apr 24, 2020 at 9:14 AM Luke Robison <lukerobison at gmail.com> wrote:

> Given the troubles I was having, I decided to go about my dependency
> generation another way, by making the source of the executables depend on
> the compiled header outputs of the libraries.  This seems to have fixed the
> problem and is probably the more correct way to use SCons.
>
> Each library/exe Sconscript Clones() the master environment, and I gather
> the output of each OutNode = env_clone.SharedObject(src_file) into a
> dictionary.  When building an exe that depends on a library, I use
> env_clone.Depend( exe_src, OutNodes ).
>
> Does that seem like I'm abusing the SCons approach or is that an
> acceptable method to encode these sorts of higher-level dependencies?
>
> Thanks for your help.
>
> On Fri, Apr 24, 2020 at 10:36 AM Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
>> not sure what to tell you then.
>> SCons normallizes paths based on it's own representation.
>> It doesn't store the path you specified the file with.
>>
>>
>> On Fri, Apr 24, 2020 at 8:31 AM Luke Robison <lukerobison at gmail.com>
>> wrote:
>>
>>> 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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