Issue #9189 has been updated by pcai (Peter Cai). I'm unable to reproduce. Windows presents an ascii-safe alias of the TEMP folder for me so I can't seem to test the handling: * windows 11 (Version 10.0.22621 Build 22621) * Ruby+Devkit 3.2.2-1 (x64) ``` C:\work>ruby -e "system('set TEMP')" TEMP=C:\Users\6863~1\tmp C:\work>set TEMP TEMP=C:\Users\6863~1\tmp C:\work>cd C:\Users\희섭\tmp C:\Users\희섭\tmp>echo %cd% C:\Users\희섭\tmp C:\Users\희섭\tmp>ruby -v ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt] ``` ---------------------------------------- Bug #9189: Build failure on Windows in case of nonascii TEMP environment. https://bugs.ruby-lang.org/issues/9189#change-105311 * Author: phasis68 (Heesob Park) * Status: Assigned * Priority: Normal * ruby -v: ruby 2.1.0dev (2013-11-30 trunk 43936) [i386-mingw32] * Backport: 1.9.3: DONTNEED, 2.0.0: REQUIRED ---------------------------------------- I experienced a build failure during build extension library with trunk on Windows. make[2]: Entering directory `/c/work/ruby-2.1.0-r43936/ext/bigdecimal' generating bigdecimal-i386-mingw32.def compiling bigdecimal.c In file included from bigdecimal.c:20:0: bigdecimal.h:62:1: error: static declaration of 'labs' follows non-static declar ation make[2]: *** [bigdecimal.o] Error 1 make[2]: Leaving directory `/c/work/ruby-2.1.0-r43936/ext/bigdecimal' make[1]: *** [ext/bigdecimal/all] Error 2 make[1]: Leaving directory `/c/work/ruby-2.1.0-r43936' make: *** [build-ext] Error 2 I found the cause of this error is mkmk failure. Here is a part of mkmf.log have_func: checking for labs() in stdlib.h... -------------------- no "i686-w64-mingw32-gcc -o conftest.exe -I../../.ext/include/i386-mingw32 -I../.././include -I../.././ext/bigdecimal -D_WIN32_WINNT=0x0501 -D_FILE_OFFSET_BITS=64 -O3 -fno-omit-frame-pointer -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -L../.. -L. -lmsvcrt-ruby210-static -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi " This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Cannot create temporary file in C:\Users\??苑?AppData\Local\Temp\: Invalid argument The TEMP environment varable is C:\work\ruby-2.1.0-r43936>set TEMP TEMP=C:\Users\희섭\AppData\Local\Temp It seems that miniruby cannot handle encoding properly. C:\work\ruby-2.1.0-r43936>miniruby -ve "p ENV['TEMP']" ruby 2.1.0dev (2013-11-30 trunk 43936) [i386-mingw32] "C:\\Users\\\xED\x9D\xAC\xEC\x84\xAD\\AppData\\Local\\Temp" C:\work\ruby-2.1.0-r43936>miniruby.exe -ve "p ENV['TEMP'].encoding" ruby 2.1.0dev (2013-11-30 trunk 43936) [i386-mingw32] #<Encoding:ASCII-8BIT> Whereas, the final ruby can handle encoding properly. C:\work>ruby -ve "p ENV['TEMP']" ruby 2.1.0dev (2013-11-30 trunk 43923) [i386-mingw32] "C:\\Users\\희섭\\AppData\\Local\\Temp" C:\work>ruby -ve "p ENV['TEMP'].encoding" ruby 2.1.0dev (2013-11-30 trunk 43923) [i386-mingw32] #<Encoding:CP949> -- https://bugs.ruby-lang.org/