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The 'core' library contains almost all the same objects as 'common', but leaves out hat.c. And the auxiliary program 'hatgen' now links against that slightly reduced core library instead of 'common'. This avoids a dependency loop: one of hatgen's jobs is to generate hat-tables.h, but hat-tables.h is a dependency of it. Of course, the generated hat-tables.h is already committed, so this doesn't present a bootstrapping problem in a normal build. But if someone modifies hatgen.c in order to regenerate hat-tables.h, and does so in a way that makes it uncompilable, they can't rebuild hatgen and try again! Of course you can always revert changes with git, but it's annoying to have to. Better to keep the dependencies non-cyclic in the first place.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.