Fix Darwin native stdenv #107995
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Fix Darwin native stdenv #107995
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When version is null, we just leave out the trailing - part. This fixes an issue where null version caused derivations to hit an evaluation error.
This should work the same as in linux. We just need a prefix where the toolchain resides. By default, this is /usr on Darwin / macOS with XCode Command Line Tools.
The bash in /bin/bash is too old (3.2.57) to run setup.sh correctly. Native tools users need at least Bash 4 to use Nixpkgs.
In native stdenv, stdenv.cc may be set, but stdenv.cc.cc is not. So we need to verify this to avoid an evaluation error.
/usr/local is usually going to be newer & more compatible with the system than /usr & /. For instance, macOS / Darwin comes with /bin/chmod which doesn’t understand ‘--’ flags. So, give /usr/local precedence so that the user can install the GNU versions of these utils themselves.
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Since we are not quite ready on #105026, I wanted to look into getting native darwin stdenv working again. There were quite a few evaluation errors which needed to be fixed.
In testing, I installed coreutils-8.32 and bash-5.1 in /usr/local.