switch("cpu", "i386") with --cc:vcc doesn't work when it is written on *.nims

[demotomohiro]

switch("cpu", "i386") with --cc:vcc doesn't work when it is written on *.nims

When I set --cpu:i386 option on nims file, vccexe.exe is called with --platform:amd64 option from Nim and I got following compile error.
It looks like Nim compiler trying to build 32bit executable but passing wrong option (it should be --platform:x86) to vccexe.exe
When I set --cc:vcc --cpu:i386 option on command line, vccexe.exe is called with --platform:x86 option and Nim compiler works without errors.

Spec:
Nim: Build from git clone with PR #10383 merged.
OS: Windows 8.1
Backend: Visual Studio 2015

testvcc.nim:

echo sizeof(pointer)

testvcc.nims

switch("cpu", "i386")

Log:

f:\project\demotomohiro\testvcc>..\Nim\bin\nim.exe c --cc:vcc --listcmd -r testvcc.nim
Hint: used config file 'f:\project\demotomohiro\Nim\config\nim.cfg' [Conf]
Hint: used config file 'f:\project\demotomohiro\Nim\config\config.nims' [Conf]
Hint: system [Processing]
Hint: testvcc [Processing]
vccexe.exe /c --platform:amd64 /nologo  /If:\project\demotomohiro\Nim\lib /If:\project\demotomohiro\testvcc /Fof:\temp\nimcach
e\testvcc\debug\stdlib_system.c.obj f:\temp\nimcache\testvcc\debug\stdlib_system.c
vccexe.exe /c --platform:amd64 /nologo  /If:\project\demotomohiro\Nim\lib /If:\project\demotomohiro\testvcc /Fof:\temp\nimcach
e\testvcc\debug\testvcc.c.obj f:\temp\nimcache\testvcc\debug\testvcc.c
Error: execution of an external compiler program 'vccexe.exe /c --platform:amd64 /nologo  /If:\project\demotomohiro\Nim\lib /I
f:\project\demotomohiro\testvcc /Fof:\temp\nimcache\testvcc\debug\testvcc.c.obj f:\temp\nimcache\testvcc\debug\testvcc.c' fail
ed with exit code: 2

testvcc.c
f:\project\demotomohiro\Nim\lib\nimbase.h(490): error C2118: 添字が負の数です。(Index is negative value) ..\lib\system.nim(3016)  sysFatal
Error: unhandled exception: errno: 2 `No such file or directory` [IOError]

Log (add --cpu:i386 to command line option):

f:\project\demotomohiro\testvcc>..\Nim\bin\nim.exe c --cc:vcc --cpu:i386 --listcmd -r testvcc.nim
Hint: used config file 'f:\project\demotomohiro\Nim\config\nim.cfg' [Conf]
Hint: used config file 'f:\project\demotomohiro\Nim\config\config.nims' [Conf]
Hint: system [Processing]
Hint: testvcc [Processing]
vccexe.exe /c --platform:x86 /nologo  /If:\project\demotomohiro\Nim\lib /If:\project\demotomohiro\testvcc /Fof:\temp\nimcache\
testvcc\debug\stdlib_system.c.obj f:\temp\nimcache\testvcc\debug\stdlib_system.c
vccexe.exe /c --platform:x86 /nologo  /If:\project\demotomohiro\Nim\lib /If:\project\demotomohiro\testvcc /Fof:\temp\nimcache\
testvcc\debug\testvcc.c.obj f:\temp\nimcache\testvcc\debug\testvcc.c
Hint: vccexe.exe    --platform:x86 /nologo /DEBUG /Zi /F33554432  /Fef:\project\demotomohiro\testvcc\testvcc.exe  f:\temp\nimc
ache\testvcc\debug\stdlib_system.c.obj f:\temp\nimcache\testvcc\debug\testvcc.c.obj  [Exec]
Hint: operation successful (24038 lines compiled; 9.834 sec total; 25.129MiB peakmem; Debug Build) [SuccessX]
Hint: f:\project\demotomohiro\testvcc\testvcc.exe  [Exec]
4

[demotomohiro]

loadConfigsAndRunMainCommand procedure in compiler/cmdlinehelper.nim run nim script file after loading config files.
cpu or os switch set on nim script doesn't affect @if CPU/OS branch in config/nim.cfg.
I think i386.windows.vcc.* options need to be added on config/nim.cfg, because compiling 32bit executable (cpu:i386) on 64bit windows is cross compilation.

cpu or os switches cannot be set on *.nims file bug might exist on other platform.
I don't have nintendo switch SDK but when I set os:nintendoswitch on test.nims file, I got different error that I got when I set that switch on command line.

Output when I add --os:nintendoswitch on commad line:

f:\temp>nim c --listcmd --os:nintendoswitch test.nim
Hint: used config file 'f:\project\nim-lang\Nim\config\nim.cfg' [Conf]
Hint: used config file 'f:\project\nim-lang\Nim\config\config.nims' [Conf]
Hint: system [Processing]
Hint: widestrs [Processing]
Hint: io [Processing]
Hint: test [Processing]
cannot create directory: \tmp\nimcache\test\debug

test.nims:

switch("os", "nintendoswitch")

Output when I set os:nintendoswitch on test.nims:
(switch_gcc.options.always set on config/nim.cfg is not used)

f:\temp>nim c --listcmd test.nim
Hint: used config file 'f:\project\nim-lang\Nim\config\nim.cfg' [Conf]
Hint: used config file 'f:\project\nim-lang\Nim\config\config.nims' [Conf]
Hint: system [Processing]
Hint: widestrs [Processing]
Hint: io [Processing]
Hint: test [Processing]
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\stdlib_indexerrors.c
.o f:\temp\nimcache\test\debug\stdlib_indexerrors.c
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\stdlib_switch_memory
.c.o f:\temp\nimcache\test\debug\stdlib_switch_memory.c
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\stdlib_widestrs.c.o
f:\temp\nimcache\test\debug\stdlib_widestrs.c
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\stdlib_io.c.o f:\tem
p\nimcache\test\debug\stdlib_io.c
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\stdlib_system.c.o f:
\temp\nimcache\test\debug\stdlib_system.c
gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -o f:\temp\nimcache\test\debug\test.c.o f:\temp\nim
cache\test\debug\test.c
Error: execution of an external compiler program 'gcc.exe -c  -w -mno-ms-bitfields  -If:\project\nim-lang\Nim\lib -If:\temp -
o f:\temp\nimcache\test\debug\stdlib_system.c.o f:\temp\nimcache\test\debug\stdlib_system.c' failed with exit code: 1

f:\temp\nimcache\test\debug\stdlib_system.c:15:10: fatal error: switch/kernel/virtmem.h: No such file or directory
 #include <switch/kernel/virtmem.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

[demotomohiro]

I guess cross compilation configuration in config/nim.cfg must be set with $cpu.$os.$cc.* = "options" format and must not use @if branch to specify targetOS or targetCPU.