[Scons-users] C/C++ Object Suffix to include source names

[Hua Yanghao]

I guess I should better explain the use case scenario here too.

For example, in my build environment, I would like to have an empty source
folder containing only one SConscript:

firmware/path/to/empty/SConscript:

import os
Import("usw_files")
Import("usw_config_dict") # content loaded from ~/.usw_config yaml file,
where user can configure the location of arduino IDE
arduino_base = usw_config_dict['arduino']['usw_root']
cores = "hardware/arduino/avr/cores/arduino"
base = os.path.join(arduino_base, cores)
lib_files = [ "wiring.c", "wiring.S", ....]
lib_files = [os.path.join(base, f) for f in lib_files]
usw_files("elf_static_lib", lib_files, base=base)


With above SConscript, I am now able to have *foreign* C/CPP files compiled
into the variant_dir:
build/configs/avr/test/firmware/path/to/empty/*.{c,cpp,S, ...}.o

The entire emitter code is then:

import os

def targets_change(targets, sources, env):
    #return targets, sources
    new_targets = []
    module_base = env["USW_MODULE_BASE"]
    for i in sources:
        new_path = os.path.relpath(i.path, module_base)
        #print("#"*40)
        #print(i.name)
        #print(i.path)
        #print(new_path)
        #print("#"*40)
        new = new_path +'.o'
        new_targets.append(new)
    return new_targets, sources


Hope this could be helpful to someone who might be trying to implement the
same thing.
The idea is to compile the source code out of a existing tools delivery
into the project compilation folder (variant_dir), without the need of
copying the source code. Many projects internally and externally are
delivering source code directly with their toolchain so this can become
quite handy.
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