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3b9cafa09f
This fixes a build failure introduced by commit 2e48ce132e011e8 yesterday. When I saw that commit I expected the most likely problem would be in the NestedVM build, which is currently the thing with the most most out-of-date C implementation. And indeed the NestedVM toolchain doesn't have <tgmath.h> - but much more surprisingly, our _Windows_ builds failed too, with a compile error inside <tgmath.h> itself! I haven't looked closely into the problem yet. Our Windows builds are done with clang, which comes with its own <tgmath.h> superseding the standard Windows one. So you'd _hope_ that clang could make sense of its own header! But perhaps the problem is that this is an unusual compile mode and hasn't been tested. My fix is to simply add a cmake check for <tgmath.h> - which doesn't just check the file's existence, it actually tries compiling a file that #includes it, so it will detect 'file exists but is mysteriously broken' just as easily as 'not there at all'. So this makes the builds start working again, precisely on Ben's theory of opportunistically using <tgmath.h> where possible and falling back to <math.h> otherwise. It looks ugly, though! I'm half tempted to make a new header file whose job is to include a standard set of system headers, just so that that nasty #ifdef doesn't have to sit at the top of almost all the source files. But for the moment this at least gets the build working again.
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/>.