手动编译 OpenSSL (Windows)

1. Download openssl

https://www.openssl.org/source/

2. Download & install Perl

https://www.perl.org/get.html

3. Set vs build env(eg: vs2019 64bit)

execute  C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat

4. Configure

cd openssl source folder

perl Configure debug-VC-WIN32 no-asm --prefix="c:\openssl"

--prefix point to installation path

release version use VC-WIN32

5.Generate .mak file

ms\do_ms.bat or ms\do_ms64a.bat

7. build and install static/dynamic library

nmake -f ms\nt.mak

nmake -f ms\nt.mak install

nmake -f ms\ntdll.mak

nmake -f ms\ntdll.mak install

8. Possible error when compile

error LNK2001: unresolved external symbol OPENSSL_rdtsc

Fix:  OPENSSL_rdtsc is only relevant on some platforms, and isn't present on others which is why this problem occurs. Perhaps later Visual Studio versions are more tolerant of this? Removing the entry from util/libeay.num is fine as a workaround for now, and won't cause any adverse impacts.

fatal error LNK1181: cannot open input file 'out32dll\libeay32.lib'

Fix: copy relative .lib file in prefix installation file to out32dll folder