[package] mimalloc/*: Unexpected override of MI_WIN_REDIRECT

[NickGaertner]

Description

The conan recipe silently turns off the redirect mechanism on Windows by setting MI_WIN_REDIRECT = "OFF". Unfortunately, the mechanism is required on Windows for mimalloc to properly work with third party code, see their description for details.

The override is unexpected, since it

• contradicts the upstream CMake default value,
• isn't communicated to the package consumer and
• results in mysteriously broken builds, which seem to work until third party libraries are involved.

The PR (#23709) that introduced that line only did it so to fix intermediate versions 1.8.4 and 2.1.4. The final versions added were 1.8.7 and 2.8.7 instead, which would've built fine without setting MI_WIN_REDIRECT = "OFF" (verified locally).

I propose to add a recipe option for MI_WIN_REDIRECT to add transparency for users but disable it by default to avoid breaking builds.

Package and Environment Details

• Package Name/Version: mimalloc/*
• Operating System+version: Windows*

Conan profile

# The profile I used for tests
[settings]
arch=x86_64
build_type=Release
compiler=msvc
compiler.cppstd=14
compiler.runtime=dynamic
compiler.runtime_type=Release
compiler.version=194

Steps to reproduce

N/A

Logs

N/A