[question] Issue with replace_requires and zlib-ng compatibility in Conan

[karel-tomanec]

What is your question?

Hi,

I am using zlib-ng in my project build, packaged via the official Conan recipe. I would like to integrate minizip-ng, which depends on zlib and OpenSSL. OpenSSL also uses zlib. My goal is to replace all zlib dependencies with zlib-ng, as it should be API-compatible when the zlib_compat=True option is set.

I found that this can potentially be achieved using [replace_requires] as described in the https://blog.conan.io/2024/02/20/Conan-2-graph-features.html.

Build profile:

[settings]
arch=x86_64
build_type=Release
compiler=msvc
compiler.cppstd=14
compiler.runtime=dynamic
compiler.version=194
os=Windows

Host profile:

[settings]
arch=x86_64
build_type=Release
compiler=msvc
compiler.cppstd=14
compiler.runtime=dynamic
compiler.version=194
os=Windows

[options]
zlib-ng/*:zlib_compat=True

[replace_requires]
zlib/*: zlib-ng/2.2.2

However, when I try to install all the dependencies for minizip-ng, I encounter the following error:

Error: minizip-ng/4.0.7: Error in generate() method, line 125
	deps.generate()
	ConanException: error generating context for 'openssl/3.3.2': Component 'zlib-ng::zlib' not found in 'zlib-ng' package requirement

It seems that using [replace_requires] modifies the component from zlib::zlib to zlib-ng::zlib. However, for the zlib_compat=True option, I believe the component should remain zlib::zlib. This issue also occurs when I try to use OpenSSL directly as a dependency (without involving minizip-ng).

Any guidance or suggestions on resolving this would be greatly appreciated.

Additional Info:

• Conan version: 2.9.1

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide

[memsharded]

Thanks for your question @karel-tomanec

I have been able to reproduce with:

conan install --requires="minizip-ng/[*]" -pr=profile --build=missing

I am investigating it.