[Scons-users] scons add source file suffix for env.Object()

[Mats Wichmann]

On 10/29/24 07:17, 于 wrote:
> Hello,
> 
>          I use scons to build MCU project, and the project need asm 
> files. The file suffix is *.850.
>          Scons report a error message "scons: *** While building `['']': 
> Cannot deduce file extension from source files".
>          I think I can add environment to resolve the problem. But I 
> don't know how to set src_suffix.
>          Thanks everyone.

It's not entirely trivial, and involves using features that are not 
documented as part of the "public API" - that is, you won't find these 
in the man page.

You can write your own builder for those files - that's the place you 
can specify src_suffix by that name - or you can sneak in and modify the 
existing Object (and maybe SharedObject?) builders. The latter is 
probably easier because Object (which is a synonym for StaticObject) is 
already plumbed into the system.

In general terms, that could look like this, assuming your situation 
just uses the regular assembler and doesn't require special syntax, etc. 
(you didn't say). This has to happen after the construction environment 
is created:

import SCons.Defaults

static_obj = env["BUILDERS"]["StaticObject"]
suffix = ".850"
static_obj.add_action(suffix, SCons.Defaults.ASAction)
static_obj.add_emitter(suffix, SCons.Defaults.StaticObjectEmitter)
# repeat if needed for SharedObject

There may be additional steps needed.

It that works out you can turn it into a tool - see the User Guide for 
some details on how to do that.  The advantage of a tool is you put its 
name in the tool list when instantiating an Environment, like

env = Environment(tools=["default", "myasm"])

and it just gets taken care of...