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Merge pull request #1715 from domosekai/domosekai-patch-1

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Add build instruction for dynamic linking OpenSSL
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Yihong Wu 2022-11-27 19:52:10 +09:00 committed by GitHub
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src/BUILD_WINDOWS.md
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@ -112,6 +112,34 @@ into it. So that is what will be described below.
Delete and regenerate CMake cache after the change.
1. OpenSSL
The above instruction builds OpenSSL library statically in the SoftEther binaries,
so that when you distribute the installer to others they will not need to install OpenSSL separately.
However, the downside is that the OpenSSL library cannot be updated without a rebuild and reinstallation of SoftEther.
It's also possible to build OpenSSL library dynamically so that you can update OpenSSL without rebuilding SoftEther.
To achieve that, you need to remove `openssl` from `vcpkg.json` and install OpenSSL directly.
Installing from a package manager such as [Scoop](https://scoop.sh/) would make the subsequent updates easily.
However, you should avoid using [Winget](https://learn.microsoft.com/en-us/windows/package-manager/winget/)
for the time being because due to a bug it cannot detect the correct version of OpenSSL, causing endless updates.
If you install from Scoop, make sure to add the OpenSSL folder to the system's `PATH`.
As Scoop already adds it to the user's `PATH`, just copy the same location into the system environment variable(s).
SoftEther Client Service starts from the System account and will fail to start if OpenSSL is not in the global `PATH`.
Building should be straightforward. You can verify that the binaries are now linked against the locally installed OpenSSL
with tools like `ldd` (available from Git Bash):
```bash
$ ldd /c/Program\ Files/SoftEther\ VPN\ Client\ Developer\ Edition/vpnclient.exe
...
libcrypto-3-x64.dll => /c/Scoop/apps/openssl/current/bin/libcrypto-3-x64.dll (0x7ff8beb70000)
libssl-3-x64.dll => /c/Scoop/apps/openssl/current/bin/libssl-3-x64.dll (0x7ff8beaa0000)
...
```
1. 32-bit Windows
You don't need 32-bit Windows to build 32-bit executables. However, if 32-bit Windows is what you only have, things become a little complicated.