capnproto: add lite_mode option #26282
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Hi maintainers, when you get a chance, please also check out PR #23787 from last April; it is relevant to the same project that got me to create this PR. I'd have all customized recipes upstreamed once that one is merged too. Thanks! |
Cap'n Proto's lite mode disables all reflection and I/O features, so
that a lean library for encoding and decoding messages remains. This
especially is required for targeting Android with API level 21,
because libkj-async requires API level 23 or later for sigtimedwait.
It may be necessary to additionally add a tool_requires("capnproto")
when using lite mode, just like when cross-compiling, so that capnpc
is available to the lite build of libcapnp and libkj.
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Summary
Changes to recipe: capnproto/all
Motivation
Cap'n Proto's build scripts provide a "lite mode" build option, where only libkj and a subset of libcapnp (no reflection) is built. This PR exposes it via a Conan option, so that lite mode can be used by Conan packages that do not depend on full functionality and need to be small or more portable (e.g. for old Androids).
Details
The changes to enable lite mode are minimal: This merely modified the value of --enable-reflection/CAPNP_LITE, and updates the components list depending on the option value.
Users can use Cap'n Proto like so to compile schema files in their CMakeLists, while using a stripped-down version of Cap'n Proto in their application (cross-)build.
Tested on macOS 15.2 and cross-compiled to Android with NDK r27 and iOS 18.