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bd1d00a4b3
In some cases `ZLIB::ZLIB` and/or `OpenSSL::Crypto` may be aliases,
which prevents setting a libssh2-specific property (.pc module name)
in them:
```
CMake Error at [...]/src/CMakeLists.txt:... (set_target_properties):
set_target_properties can not be used on an ALIAS target.
```
This can happen when doing "superbuilds" with classic zlib or zlib-ng,
which define `ZLIB::ZLIB` on their own, but as an alias, unlike CMake
does with the canonical `ZLIB::ZLIB` target.
Fix by special-casing these built-in targets and manually converting
them to .pc module names, without using the targets themselves
to carry this information throughout libssh2's internal build logic.
A side-effect of this change is that `zlib` is now present in libssh2.pc
when zlib is an indirect dependency via a crypto backend (OpenSSL or
wolfSSL). Before this patch it only appeared there when enabling zlib
explicitly for libssh2.
Ref: https://github.com/curl/curl/pull/20316
Follow-up to df0563a857 #1535
Closes #1789
libssh2 - SSH2 library
libssh2 is a library implementing the SSH2 protocol, available under the revised BSD license.
Installation instructions: