Unknown compiler option "--platform:x86" for vcc

[slangmgh]

The nim compiler add an unknown compiler option "--platform:x86" for x86.

Example

echo "Hello World!"

Current Output

> nim c hello
D:\Tool\Nim\tmp>nd hello
CC: stdlib_io.nim
CC: stdlib_system.nim
CC: hello.nim
cl: command line warning D9002 :ignore unknown option“--platform:x86”

Possible Solution

Additional Information

OS: win10
32bit nim
c compiler: vc2008, vc2013, vc2017

D:\Tool\Nim\tmp>nim -v
Nim Compiler Version 1.0.0 [Windows: i386]
Compiled at 2019-09-28
Copyright (c) 2006-2019 by Andreas Rumpf

active boot switches: -d:release

[demotomohiro]

I tested Nim-1.0.0 32bit on windows 8.1 but I didn't get such warning from cl.exe.

You need to add --cc:vcc option to command line or nim.cfg file to make Nim use vcc.
How did you changed nim.cfg or *.nims file to use vcc?

If you compile hello.nim with --listcmd option like this show how Nim call vccexe.exe.

nim c --listcmd hello.nim

Nim compiler doesn't call cl.exe directly but call vccexe.exe when you use --cc:vcc options.
Nim compiler call vccexe.exe with --platform:x86 option and options that are passed to cl.exe.
vccexe.exe should pass given options to cl.exe except --platform:x86.

[slangmgh]

Yes, you are right. I don't use vcc.exe, I always setup the PATH myself.
I can setup a custom compiler to use msvc.

[slangmgh]

Compile speed using vccexe.exe is much slow than using plain "cl.exe".
Using vccexe.exe:

Hint: operation successful (144159 lines compiled; 8.631 sec total; 146.035MiB peakmem; Release Build) [SuccessX]

Using cl.exe:

Hint: operation successful (144131 lines compiled; 4.186 sec total; 145.824MiB peakmem; Release Build) [SuccessX]