https://git.ruby-lang.org/ruby.git/commit/?id=eaa1c3190a

From eaa1c3190a41140c6459dc48c91a19f346c8df74 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 4 Jul 2021 10:45:24 +0900
Subject: [Win32] Fix assembler name when cross compiling

Hostx64\x86\nmake.exe sets AS to ml64 which targets amd64, but we
need assembler for x86.
---
 win32/setup.mak | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/win32/setup.mak b/win32/setup.mak
index 0f6b26d..5294a49 100644
--- a/win32/setup.mak
+++ b/win32/setup.mak
@@ -22,7 +22,6 @@ MAKEFILE = Makefile https://github.com/ruby/ruby/blob/trunk/win32/setup.mak#L22
 CPU = PROCESSOR_LEVEL
 CC = $(CC) -nologo
 CPP = $(CC) -EP
-AS = $(AS) -nologo
 
 all: -prologue- -generic- -epilogue-
 i386-mswin32: -prologue- -i386- -epilogue-
@@ -237,8 +236,15 @@ MACHINE = x86 https://github.com/ruby/ruby/blob/trunk/win32/setup.mak#L236
 # RFLAGS = -r
 # EXTLIBS =
 CC = $(CC)
-AS = $(AS)
+!if "$(AS)" != "ml64"
+AS = $(AS) -nologo
+!endif
 <<
+!if "$(AS)" == "ml64"
+	@(findstr -r -c:"^MACHINE *= *x86" $(MAKEFILE) > nul && \
+	(echo AS = $(AS:64=) -nologo) || \
+	(echo AS = $(AS) -nologo) ) >>$(MAKEFILE)
+!endif
 	@(for %I in (cl.exe) do @set MJIT_CC=%~$$PATH:I) && (call echo MJIT_CC = "%MJIT_CC:\=/%" -nologo>>$(MAKEFILE))
 	@type << >>$(MAKEFILE)
 
-- 
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