forked from mirrors/nixpkgs
ba52ae5048
Following legacy packing conventions, `isArm` was defined just for
32-bit ARM instruction set. This is confusing to non packagers though,
because Aarch64 is an ARM instruction set.
The official ARM overview for ARMv8[1] is surprisingly not confusing,
given the overall state of affairs for ARM naming conventions, and
offers us a solution. It divides the nomenclature into three levels:
```
ISA: ARMv8 {-A, -R, -M}
/ \
Mode: Aarch32 Aarch64
| / \
Encoding: A64 A32 T32
```
At the top is the overall v8 instruction set archicture. Second are the
two modes, defined by bitwidth but differing in other semantics too, and
buttom are the encodings, (hopefully?) isomorphic if they encode the
same mode.
The 32 bit encodings are mostly backwards compatible with previous
non-Thumb and Thumb encodings, and if so we can pun the mode names to
instead mean "sets of compatable or isomorphic encodings", and then
voilà we have nice names for 32-bit and 64-bit arm instruction sets
which do not use the word ARM so as to not confused either laymen or
experienced ARM packages.
[1]: https://developer.arm.com/products/architecture/a-profile
36 lines
1.4 KiB
Nix
36 lines
1.4 KiB
Nix
{ stdenv, fetchurl, version, sha256, ... }@args:
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stdenv.mkDerivation (rec {
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name = "jemalloc-${version}";
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inherit version;
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src = fetchurl {
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url = "https://github.com/jemalloc/jemalloc/releases/download/${version}/${name}.tar.bz2";
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inherit sha256;
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};
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# By default, jemalloc puts a je_ prefix onto all its symbols on OSX, which
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# then stops downstream builds (mariadb in particular) from detecting it. This
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# option should remove the prefix and give us a working jemalloc.
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configureFlags = stdenv.lib.optional stdenv.isDarwin "--with-jemalloc-prefix="
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# jemalloc is unable to correctly detect transparent hugepage support on
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# ARM (https://github.com/jemalloc/jemalloc/issues/526), and the default
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# kernel ARMv6/7 kernel does not enable it, so we explicitly disable support
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++ stdenv.lib.optional stdenv.isAarch32 "--disable-thp";
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doCheck = true;
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enableParallelBuilding = true;
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meta = with stdenv.lib; {
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homepage = http://jemalloc.net;
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description = "General purpose malloc(3) implementation";
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longDescription = ''
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malloc(3)-compatible memory allocator that emphasizes fragmentation
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avoidance and scalable concurrency support.
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'';
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license = licenses.bsd2;
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platforms = platforms.all;
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maintainers = with maintainers; [ wkennington ];
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};
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} // (builtins.removeAttrs args [ "stdenv" "fetchurl" "version" "sha256" ]))
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