Hello there!
I was playing around with enabling debugging symbols for a package and bumped into Debug Symbols - NixOS Wiki
So i tried with a simple example:
nix-build -E 'with import <nixpkgs> {}; enableDebugging hello'
This compiles fine, but when I open it with gdb this is what happens:
$ gdb /nix/store/cxd2mxzy6zxsjig914cqcic2afbj3rbq-hello-2.10/bin/hello
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Reading symbols from /nix/store/cxd2mxzy6zxsjig914cqcic2afbj3rbq-hello-2.10/bin/hello...
warning: Could not open OSO archive file "/private/var/folders/9h/0j3p28r17xv2_rd06db5548h0000gn/T/nix-build-hello-2.10.drv-0/hello-2.10/./lib/libhello.a"
warning: `/private/var/folders/9h/0j3p28r17xv2_rd06db5548h0000gn/T/nix-build-hello-2.10.drv-0/hello-2.10/src/hello.o': can't open to read symbols: No such file or directory.
(No debugging symbols found in /nix/store/cxd2mxzy6zxsjig914cqcic2afbj3rbq-hello-2.10/bin/hello)
It appears that the debug info has been installed in temp folder which has since been deleted. Is this process not supported on Mac OS?
Here are some debug infos:
# Mac OS X version: Catalina 10.15.7
$ nix-channel --list
home-manager https://github.com/nix-community/home-manager/archive/release-20.09.tar.gz
nixpkgs https://nixos.org/channels/nixpkgs-20.09-darwin
$ ls -l $(readlink -f ~/.nix-defexpr/channels/)
total 0
lrwxr-xr-x 1 arkham wheel 75 Jan 1 1970 home-manager -> /nix/store/njwlw5myd2s5v9dpzl6rg154y05xr7mx-home-manager-20.09/home-manager/
lrwxr-xr-x 1 arkham wheel 60 Jan 1 1970 manifest.nix -> /nix/store/k0f0va5lpfzg6phzwqq5xf839j1wx0gy-env-manifest.nix
lrwxr-xr-x 1 arkham wheel 86 Jan 1 1970 nixpkgs -> /nix/store/9hwyaiaa2inbbs5fwnplvqpxmlfhkcr6-nixpkgs-20.09pre246348.d395190b24b/nixpkgs/
# from https://discourse.nixos.org/t/how-to-see-what-commit-is-my-channel-on/4818/6
# it looks like the commit is https://github.com/NixOS/nixpkgs/commit/d395190b24b