Espruino Build issues using README_BuildProcess.md and Extending+Espruino+1 within Windows10 environment

Okay, getting warmer now,

Under 'Problems' tab

'cannot open source file "platform_config.h" (dependency of "jsi2c.h")'

Web search turned up:

http://forum.espruino.com/comments/14308300/

I opened the \gen folder and only a 'README' file exists.

Searching for instructions as to whether I need to create that file or if it is (failed) as a result of not all extensions in the correct place yet.

EDIT: (hour later)
From post #14 link to GitHub output shows file is auto gen'd

// Automatically generated header file for STM32F100CB
// Generated by scripts/build_platform_config.py

Verified that file 'build_platform_config.py' is within the tree both inside VSCode and within the local file system.

Re-ran make clean && make
but get

cc1: warning: unrecognized command line option ‘-Wno-expansion-to-defined’
gen/jswrapper.c: In function ‘jswOnCharEvent’:
gen/jswrapper.c:1901:34: warning: unused parameter ‘channel’ [-Wunused-parameter]
 bool jswOnCharEvent(IOEventFlags channel, char charData) {
                                  ^
gen/jswrapper.c:1901:48: warning: unused parameter ‘charData’ [-Wunused-parameter]
 bool jswOnCharEvent(IOEventFlags channel, char charData) {
                                                ^
gen/jswrapper.c: In function ‘jswGetBuiltInJSLibrary’:
gen/jswrapper.c:1905:48: warning: unused parameter ‘name’ [-Wunused-parameter]
 const char *jswGetBuiltInJSLibrary(const char *name) {
                                                ^
cc1plus: warning: unrecognized command line option ‘-Wno-expansion-to-defined’
gen/jswrapper.c: At top level:
cc1: warning: unrecognized command line option ‘-Wno-expansion-to-defined’
LD espruino
rgc@DESKTOP-R7T0VUC:~/source/repos/github/espruino/Espruino$

and still have error under 'Problems' tab:

'cannot open source file "platform_config.h" (dependency of "jsi2c.h")'