This seems wrong in an obvious way 
$ perl -e" dd(@ARGV) " --  ..\miniperl.exe -I..\lib config_sh.PL "INST
+_TOP=C:\perl" "INST_VER=" "INST_ARCH=\" "archname=MSWin32-x64-multi-t
+hread" "cc=gcc" "ld=g++" "ccflags= -s -O2 -DWIN32 -DWIN64 -DCONSERVAT
+IVE  -DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_
+SYS -DUSE_PERLIO -fwrapv -fno-strict-aliasing -mms-bitfields" "usecpl
+usplus=" "cf_email=" "d_mymalloc=undef" "libs= -lmoldname -lkernel32 
+-luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -
+loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion -lodbc32
+ -lodbccp32 -lcomctl32" "incpath=c:\Program Files\mingw-w64\x86_64-8.
+1.0-posix-seh-rt_v6-rev0\mingw64\include" "libperl=libperl530.a" "lib
+pth=c:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\ming
+w64\lib;" "libc=" "make=gmake" "_o=.o" "obj_ext=.o" "_a=.a" "lib_ext=
+.a" "static_ext=Win32CORE" "usethreads=define" "useithreads=define" "
+usemultiplicity=define" "useperlio=define" "use64bitint=define" "usel
+ongdouble=undef" "uselargefiles=define" "usesitecustomize=undef" "def
+ault_inc_excludes_dot=define" "LINK_FLAGS=-s -L\"C:\perl\lib\\CORE\" 
+-L\"c:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\ming
+w64\lib\"" "optimize=-s -O2" "ARCHPREFIX=" "WIN64=define" config.gc 

(
  "..\\miniperl.exe",
  "-I..\\lib",
  "config_sh.PL",
  "INST_TOP=C:\\perl",
  "INST_VER=",
  "INST_ARCH=\" archname=MSWin32-x64-multi-thread cc=gcc ld=g++ ccflag
+s=",
  "-s",
  "-O2",
  "-DWIN32",
  "-DWIN64",
  "-DCONSERVATIVE",
  "-DPERL_TEXTMODE_SCRIPTS",
  "-DPERL_IMPLICIT_CONTEXT",
  "-DPERL_IMPLICIT_SYS",
  "-DUSE_PERLIO",
  "-fwrapv",
  "-fno-strict-aliasing",
  "-mms-bitfields usecplusplus= cf_email= d_mymalloc=undef libs=",
  "-lmoldname",
  "-lkernel32",
  "-luser32",
  "-lgdi32",
  "-lwinspool",
  "-lcomdlg32",
  "-ladvapi32",
  "-lshell32",
  "-lole32",
  "-loleaut32",
  "-lnetapi32",
  "-luuid",
  "-lws2_32",
  "-lmpr",
  "-lwinmm",
  "-lversion",
  "-lodbc32",
  "-lodbccp32",
  "-lcomctl32 incpath=c:\\Program",
  "Files\\mingw-w64\\x86_64-8.1.0-posix-seh-rt_v6-rev0\\mingw64\\inclu
+de libperl=libperl530.a libpth=c:\\Program",
  "Files\\mingw-w64\\x86_64-8.1.0-posix-seh-rt_v6-rev0\\mingw64\\lib; 
+libc= make=gmake _o=.o obj_ext=.o _a=.a lib_ext=.a static_ext=Win32CO
+RE usethreads=define useithreads=define usemultiplicity=define useper
+lio=define use64bitint=define uselongdouble=undef uselargefiles=defin
+e usesitecustomize=undef default_inc_excludes_dot=define LINK_FLAGS=-
+s",
  "-L\"C:\\perl\\lib\\\\CORE\"",
  "-L\"c:\\Program",
  "Files\\mingw-w64\\x86_64-8.1.0-posix-seh-rt_v6-rev0\\mingw64\\lib\"
+ optimize=-s",
  "-O2 ARCHPREFIX= WIN64=define config.gc  ",
)

[download]

How did you get  "INST_ARCH=\"? The only way I can see is by passing  INST_ARCH=\

I suggest you turn this on by editing GNUmakefile like you're supposed to

In reply to Re: Perl compilation on Windows with INST_ARCH set fails by Anonymous Monk
in thread Perl compilation on Windows with INST_ARCH set fails by ivpri

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