gengtype and automatically generated files

[Bill Schmidt]

On 1/4/21 1:36 PM, Jeff Law wrote:
>
> On 1/4/21 10:40 AM, Bill Schmidt via Gcc wrote:
>> Hi!  I'm attempting to do something that may not have been done
>> before, so I'm looking for advice, or a pointer to where, in fact, it
>> has been done before. :)
>>
>> I'm automatically generating a back-end header file that declares some
>> structures that include trees, and a bunch of global variables that
>> are also trees.  I've marked everything up appropriately, but I also
>> need to teach the garbage collector that this file exists.
>>
>> Most back-end files are automatically scanned by gengtype.  Per the
>> documentation, anything that isn't handled automatically needs to be
>> added to target_gtfiles in config.gcc.  However, I can't come up with
>> a syntax for describing a file in the gcc/ build subdirectory.  Some
>> places in config.gcc allow "./filename" as shorthand for "filename"
>> being in the current build directory, but that doesn't seem to work
>> for adding something to gtyp-input.list.
>>
>> Any recommendations on what I should do next?  At the moment it looks
>> like I might have to hack on gengtype to invent a way to scan a file
>> in the build directory, but I have a mild amount of hope that someone
>> has solved this before.  Thanks for any help!
> Yea, I don't see any indication this has ever been done before.  I'm a
> bit surprised that ./<filename> doesn't work since gengtype runs from
> the build directory and has to reference things in the source directory
> and ./<whatever> would seem to naturally reference the build directory
>
> Jeff
>
I've gotten this working, with a little hacking on gengtype needed.  
I'll propose that patch next stage 1.

Bill