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swift: use stdenv libc++ on Darwin

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Swift uses libc++ 15, but it should really be using the same libc++ from
the stdenv. While not strictly needed currently, Swift 5.9 will support
C++ interop. If Swift is not using the stdenv C++, any C++ library used
with interop would need to be rebuilt against the Swift libc++.
This commit is contained in:
Randy Eckenrode 2023-07-23 20:40:26 -04:00
parent 9ae5c2de7f
commit efdf4e9d1f
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GPG Key ID: 64C1CD4EC2A600D9
1 changed files with 18 additions and 2 deletions
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20
pkgs/development/compilers/swift/default.nix
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@ -2,11 +2,14 @@
, pkgs
, newScope
, darwin
, llvmPackages
, llvmPackages_15
, overrideCC
}:
let
swiftLlvmPackages = llvmPackages_15;
self = rec {
callPackage = newScope self;
@ -24,12 +27,25 @@ let
# used in Swift, and applies the same libc overrides as `apple_sdk.stdenv`.
clang = if pkgs.stdenv.isDarwin
then
llvmPackages_15.clang.override rec {
swiftLlvmPackages.clang.override rec {
libc = apple_sdk.Libsystem;
bintools = pkgs.bintools.override { inherit libc; };
# Ensure that Swift’s internal clang uses the same libc++ and libc++abi as the
# default Darwin stdenv. Using the default libc++ avoids issues (such as crashes)
# that can happen when a Swift application dynamically links different versions
# of libc++ and libc++abi than libraries it links are using.
inherit (llvmPackages) libcxx;
extraPackages = [
llvmPackages.libcxxabi
# Use the compiler-rt associated with clang, but use the libc++abi from the stdenv
# to avoid linking against two different versions (for the same reasons as above).
(swiftLlvmPackages.compiler-rt.override {
inherit (llvmPackages) libcxxabi;
})
];
}
else
llvmPackages_15.clang;
swiftLlvmPackages.clang;
# Overrides that create a useful environment for swift packages, allowing
# packaging with `swiftPackages.callPackage`. These are similar to