[dimpase]

CMake installations currently provide no package config or exported target, hard-code installation directories, and reconstruct memtailor as a static imported library without its ABI flags. A Debug mathic build also forces MEMT_DEBUG even if the installed dependency has the Release layout.

Install mathicConfig.cmake, version metadata, mathic::mathic, and mathic.pc, using GNUInstallDirs and the existing Autotools-compatible SONAME. The target supplies C++17 and transitive dependency requirements. Prefer memtailor's CMake config, with pkg-config support for existing distribution packages, so this PR does not require Macaulay2/memtailor#23 to merge first. Dependency discovery now requires one of those metadata formats rather than assuming ABI compatibility from headers and a library alone.

Publish the installed library's MATHIC_DEBUG setting independently of the consumer's build type, and inherit memtailor's own ABI flags. Enable CTest at the project root. Linux/macOS CI gains shared/static × Release/Debug installation checks, pkg-config flag checks, and separate Release consumers of relocated installations. The consumer requests C++11 to verify that the exported target raises the requirement to C++17. Include the new templates and fixtures in Autotools distributions, and document installation and consumption. CMake 3.18 is now required for aliases of non-global imported dependency targets.

macOS CMake CI builds released dependencies with Autotools to obtain their pkg-config metadata, which the current Homebrew memtailor bottle lacks. This does not require unmerged dependency changes.

Local Gentoo validation, at low priority with two compilation jobs:

• All 14 tests passed for Release/shared and Debug/static builds.
• Relocated installed CMake consumers and pkg-config consumers passed, including Release consumers of Debug libraries.
• Config-based dependencies were exercised in Release; pkg-config discovery was forced in Debug.
• make dist succeeded and its archive contains the new CMake templates and consumer fixtures.
• Workflow lint and diff checks passed. The full hosted Linux/macOS CI matrix passed.

This is the upstream counterpart of the CMake packaging work for the local Gentoo mathic ebuild. External mathic selection in M2 remains a separate task.

🤖 gpt-6-astra worked on this 🤖

[dimpase]

This can be simplified a bit once a new release of memtailor, 1.5+, is done (and propagated to upstreams such as Homebrew)

@d-torrance - over to you

[d-torrance]

Thanks!

I'll likely do new memtailor/mathic/mathicgb releases pretty soon. Definitely before the next M2 release in November