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Using a 64bit integer on 32bit systems will come with a bit of a performance overhead, but given that Nix doesn't use a lot of integers compared to other types, I think the overhead is negligible also considering that 32bit systems are in decline. The biggest advantage however is that when we use a consistent integer size across all platforms it's less likely that we miss things that we break due to that. One example would be: https://github.com/NixOS/nixpkgs/pull/44233 On Hydra it will evaluate, because the evaluator runs on a 64bit machine, but when evaluating the same on a 32bit machine it will fail, so using 64bit integers should make that consistent. While the change of the type in value.hh is rather easy to do, we have a few more options available for doing the conversion in the lexer: * Via an #ifdef on the architecture and using strtol() or strtoll() accordingly depending on which architecture we are. For the #ifdef we would need another AX_COMPILE_CHECK_SIZEOF in configure.ac. * Using istringstream, which would involve copying the value. * As we're already using boost, lexical_cast might be a good idea. Spoiler: I went for the latter, first of all because lexical_cast does have an overload for const char* and second of all, because it doesn't involve copying around the input string. Also, because istringstream seems to come with a bigger overhead than boost::lexical_cast: https://www.boost.org/doc/libs/release/doc/html/boost_lexical_cast/performance.html The first method (still using strtol/strtoll) also wasn't something I pursued further, because it is also locale-aware which I doubt is what we want, given that the regex for int is [0-9]+. Signed-off-by: aszlig <aszlig@nix.build> Fixes: #2339 |
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Nix, the purely functional package manager
Nix is a new take on package management that is fairly unique. Because of its purity aspects, a lot of issues found in traditional package managers don't appear with Nix.
To find out more about the tool, usage and installation instructions, please read the manual, which is available on the Nix website at http://nixos.org/nix/manual.
Contributing
Take a look at the Hacking Section of the manual. It helps you to get started with building Nix from source.
License
Nix is released under the LGPL v2.1
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit.