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Last November in commit 08365fb260ae6e3 I added a VERSIONINFO resource to the Windows puzzle binaries, with three of the four integer components of the binary version number taken from the year, month and day of the build date. The header file #define of those integers was made by a Perl one-liner which just split up $(!builddate) into the right groups of digits. But it didn't trim leading zeroes. So the build failed today because the month component of the version number was '08', which isn't a valid C integer literal (the leading 0 means octal, but 8 isn't an octal digit), and presumably therefore not valid according to llvm-rc either. I have to assume that the previous months have all worked because 01, ..., 07 _are_ valid octal integer literals and still mean the right things. I'm not 100% satisfied with this explanation, because surely the same argument applied to the day field should have meant my builds failed on the 8th and 9th of every month since I added this code last November! But I don't have any evidence left over to show why it _didn't_ fail. Perhaps I've upgraded llvm-rc past a relevant bug fix in the last month, or something.
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/>.