Hi, I'm trying to build perl 5.26.1 from source on Windows using the Visual Studio 2010 on a 64bit machine:
  1. edit win32/Makefile to set CCTYPE=MSVC100
  2. run vcvarsall.bat amd64 to open a command shell with the development environment
  3. cwd with that shell to the win32 folder
  4. run nmake

This succeeds. Now I want to build the Compress::Raw:Zlib extension, that comes with the perl tarball, against my prebuilt zlib. To do this, one needs to set the environment variables ZLIB_LIB and ZLIB_INCLUDE to the folders that contain zlib.lib resp. zlib.h and BUILD_ZLIB to "False". When I run nmake now, I get this error: 

        link -out:..\..\lib\auto\Compress\Raw\Zlib\Zlib.dll -dll -nolo
+go -nodefaultlib -debug -opt:ref,icf -ltcg  -libpath:"c:\perl\lib\COR
+E"  -machine:AMD64 Zlib.obj   "..\..\lib\CORE\perl526.lib" "C:\SAPDev
+elop\hmexternals\perl\import\content\src_zlib-1.2.11-sap7-ntamd64.tar
+.gz\zlib-1.2.11-sap7-ntamd64-release-msvc2010\lib\zlib.lib" "c:\Progr
+am Files (x86)\Microsoft Visual Studio 10.0\VC\\lib\oldnames.lib" "c:
+\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\kernel32.li
+b" "c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\user3
+2.lib" "c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\g
+di32.lib" "c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x6
+4\winspool.lib" "c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\
+lib\x64\comdlg32.lib" "c:\Program Files(x86)\Microsoft SDKs\Windows\v
+7.0A\lib\x64\advapi32.lib" "c:\Program Files (x86)\Microsoft SDKs\Win
+dows\v7.0A\lib\x64\shell32.lib" "c:\Program Files (x86)\Microsoft SDK
+s\Windows\v7.0A\lib\x64\ole32.lib" "c:\Program Files (x86)\Microsoft 
+SDKs\Windows\v7.0A\lib\x64\oleaut32.lib" "c:\Program Files (x86)\Micr
+osoft SDKs\Windows\v7.0A\lib\x64\netapi32.lib" "c:\Program Files (x86
+)\Microsoft SDKs\Windows\v7.0A\lib\x64\uuid.lib" "c:\Program Files (x
+86)\Microsoft SDKs\Windows\v7.0A\lib\x64\ws2_32.lib" "c:\Program File
+s (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\mpr.lib" "c:\Program Fil
+es (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\winmm.lib" "c:\Program 
+Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\version.lib" "c:\Pro
+gram Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\odbc32.lib" "c:
+\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\odbccp32.li
+b" "c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\lib\x64\comct
+l32.lib" "c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\\lib
+\msvcrt.lib" -def:Zlib.def
   Creating library ..\..\lib\auto\Compress\Raw\Zlib\Zlib.lib and obje
+ct ..\..\lib\auto\Compress\Raw\Zlib\Zlib.exp
Zlib.obj : error LNK2001: unresolved external symbol __security_check_
+cookie
Zlib.obj : error LNK2001: unresolved external symbol memcpy
zlib.lib(inflate.obj) : error LNK2001: unresolved external symbol memc
+py
zlib.lib(deflate.obj) : error LNK2001: unresolved external symbol memc
+py
zlib.lib(trees.obj) : error LNK2001: unresolved external symbol memcpy
Zlib.obj : error LNK2001: unresolved external symbol __imp_memmove
Zlib.obj : error LNK2001: unresolved external symbol memcmp
Zlib.obj : error LNK2001: unresolved external symbol strlen
Zlib.obj : error LNK2001: unresolved external symbol __imp__errno
Zlib.obj : error LNK2001: unresolved external symbol __imp_printf
Zlib.obj : error LNK2001: unresolved external symbol memset
zlib.lib(deflate.obj) : error LNK2001: unresolved external symbol mems
+et
LINK : error LNK2001: unresolved external symbol _DllMainCRTStartup
zlib.lib(zutil.obj) : error LNK2001: unresolved external symbol __imp_
+malloc
zlib.lib(zutil.obj) : error LNK2001: unresolved external symbol __imp_
+free
..\..\lib\auto\Compress\Raw\Zlib\Zlib.dll : fatal error LNK1120: 11 un
+resolved externals
NMAKE : fatal error U1077: '"c:\Program Files (x86)\Microsoft Visual S
+tudio 10.0\VC\BIN\amd64\link.EXE"' : return code '0x460'
Stop.

[download]

The problem is that the path to msvcrt.lib is wrong. It uses c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\\lib\msvcrt.lib, but there's the amd64 part missing. The correct path is C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\lib\amd64\msvcrt.lib. Please note the missing amd64 is NOT where there's a double backslash.

Compiling against the very same prebuilt zlib with the very same procedure works in perl 5.24.1. I suspect a problem in perl 5.26.1. I've noticed that libpth in Config_heavy.pl in 5.26.1 is libpth='"c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\\lib"', where it's libpth='\lib' in perl 5.24.1.

Does anyone have an idea? Please note that

Thanks and Regards Marc-Philip

In reply to 5.26 and prebuilt libraries on Windows by Marc-Philip

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