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_ISOC11_SOURCE is the preprocessor flag that specifies whether or not aligned_alloc is defined and exists. While GCC versions lower than 5 do include C++11 and C++14 constructs, they do not include std::aligned_alloc, so this check allows compiling on those versions of GCC by defaulting down to posix_memalign in those situations appropriately.
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Mass change to apply clang-format to everything. We are applying this in a PR by me so the (git) blame is all mine ;) but @aheejin did all the work to get clang-format set up and all the manual work to tidy up some things to make the output nicer in #2048
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have aligned_alloc() (not sure if newer macOS/Xcodes do, or if this an issue with old macOS/Xcode version) (#1862)
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The error in #1845 shows:
/<<PKGBUILDDIR>>/src/mixed_arena.h: In member function 'void* MixedArena::allocSpace(size_t, size_t)':
/<<PKGBUILDDIR>>/src/mixed_arena.h:125:43: error: 'new' of type 'MixedArena::Chunk' {aka 'std::aligned_storage<32768, 16>::type'} with extended alignment 16 [-Werror=aligned-new=]
chunks.push_back(new Chunk[numChunks]);
^
/<<PKGBUILDDIR>>/src/mixed_arena.h:125:43: note: uses 'void* operator new [](std::size_t)', which does not have an alignment parameter
/<<PKGBUILDDIR>>/src/mixed_arena.h:125:43: note: use '-faligned-new' to enable C++17 over-aligned new support
It turns out I had misread the aligned_storage docs, and they don't actually do what we need, which is a convenient cross-platform way to do aligned allocation, since new itself doesn't support that. Sadly it seems there is no cross-platform way to do it right now, so I added a header in support which abstracts over the windows and everything-else ways.
Also add some ctest testing, which runs on windows, so we get basic windows coverage in our CI.
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