analysis: add cmake toolchain analysis

toolchain-analysis/cmake.md

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+# CMake toolchain analysis
+
+[CMake](https://cmake.org) is an open-source, cross-platform family of tools
+designed to build, test and package software. CMake is used to control the
+software compilation process using simple platform and compiler independent
+configuration files, and generate native makefiles and workspaces that can be
+used in the compiler environment of your choice.
+
+## Supported platforms
+
+TODO: test cmake against currently Node.js supported platforms and toolchains
+(see [BUILDING.MD](https://github.com/nodejs/node/edit/master/BUILDING.md)).
+
+### Unsupported platforms
+
+TODO: see above
+
+## Pros
+
+* Widely used by C++ projects (probably the most used toolchain besides of
+  `make` and `autotools`).
+* Easier to upgrade all our dependencies (except V8) and easier to add new
+  dependencies that use or are compatible with CMake (which is likely based on
+  previous point)
+* It's been around for over two decades
+* Due to its popularity, it's the most likely toolchain to support all of our
+  platforms within our minimum version constraints
+
+## Cons
+
+* CMake is not on V8 tree, therefore, V8 upgrades would be just as hard as today
+  with gyp
+
+
+## Known ports
+
+* No open source known ports [1^]
+
+[1^]: It's not a full Node.js port, but
+      [bnoordhuis/v8-cmake](https://github.com/bnoordhuis/v8-cmake) adds cmake
+      support to V8
+
+## Need more info
+
+* Would cmake build affect Electron ability to build Node.js with GN in any way?
+
+## Observations
+
+* There seems to be positive reception at the idea of cmake for native modules,
+  having the same build system for building Node.js and its native modules
+* It is already possible to build node-addon-api based native modules with cmake.
+* There is the possibility of using cmake to build everything except V8, using
+  GN to build V8 and then linking it statically to Node.js