Cross compiling for mingw doesn't find gcc DLLs #38451
Description
Issue description
Cross compiling for mingw doesn't find gcc DLLs
Steps to reproduce
Check out nixpkgs 0e7c9b3
Build this derivation:
(import <nixpkgs> {
crossSystem = {
config = "x86_64-pc-mingw32";
libc = "msvcrt";
};
}).helloObserve that no DLL links are created.
post-installation fixup
DLLPATH='/nix/store/ifb3aj50q60c2scnh8f882a8r961zn26-hello-2.10-x86_64-pc-mingw32/bin:/nix/store/y5rlyv6nz8134s687d95ysc2gakwx7am-patchelf-0.9/bin:/nix/store/rf7pnq8qk9bkjpl4s2pm5dm2pk4yqhrc-paxctl-0.9/bin:/nix/store/00yzxnmmn02hfcz5zgmlij3wrnn0c92y-x86_64-pc-mingw32-gcc-cross-wrapper-7.3.0-x86_64-pc-mingw32-stage-final/bin:/nix/store/iwhhg7qpvlsgznn8ywyd0g9698sl385l-gcc-7.3.0-x86_64-pc-mingw32-stage-final/bin:/nix/store/cb3slv3szhp46xkrczqw7mscy5mnk64l-coreutils-8.29/bin:/nix/store/6bfyi9qdigj0mvprancyvg5y4l3rcm6s-x86_64-pc-mingw32-x86_64-pc-mingw32-binutils-wrapper-2.28.1/bin:/nix/store/jyl00pcg40mzfvrk29dzzc4z8mgi4mkh-x86_64-pc-mingw32-binutils-2.28.1/bin:/nix/store/cb3slv3szhp46xkrczqw7mscy5mnk64l-coreutils-8.29/bin:/nix/store/cb3slv3szhp46xkrczqw7mscy5mnk64l-coreutils-8.29/bin:/nix/store/364b5gkvgrm87bh1scxm5h8shp975n0r-findutils-4.6.0/bin:/nix/store/cg3yhpr5hfr00y0aah23pgxiijpzl6nz-diffutils-3.6/bin:/nix/store/navldm477k3ar6cy0zlw9rk43i459g69-gnused-4.4/bin:/nix/store/s63b2myh6rxfl4aqwi9yxd6rq66djk33-gnugrep-3.1/bin:/nix/store/j79xs2j519bmvq0gihz8ff4nw5aj3vlh-gawk-4.2.0/bin:/nix/store/2p00w952ljb1172nsf3jm7nsjgsw5qpw-gnutar-1.30/bin:/nix/store/d7895h1an2pgcd6a3vx3yb5fbg786lci-gzip-1.9/bin:/nix/store/qqv6r9vkpb44rw5d8wyfpx64rgqzlvdm-bzip2-1.0.6.0.1-bin/bin:/nix/store/lhp5rw0dagi5mgqwr9i3x41240ba4ypz-gnumake-4.2.1/bin:/nix/store/zqh3l3lyw32q1ayb15bnvg9f24j5v2p0-bash-4.4-p12/bin:/nix/store/gd1mp76qr4zpbw3lccivhvi30b025x51-patch-2.7.6/bin:/nix/store/aakgkcvw6j54zg38zrn1w00sgxx0zj8b-xz-5.2.3-bin/bin'
Created 0 DLL link(s) in /nix/store/ifb3aj50q60c2scnh8f882a8r961zn26-hello-2.10-x86_64-pc-mingw32/bin
Observe that the generated hello.exe doesn't run on windows as libssp-0.dll is missing.
libssp-0.dll is present in the x86_64-pc-mingw32/lib/ directory of gcc-7.3.0-x86_64-pc-mingw32-stage-final, however only the bin directories are searched (see pkgs/build-support/setup-hooks/win-dll-link.sh``:19)
This could be fixed by either changing win-dll-link to search in these directories, or by linking these DLLs into the bin/ directory of the cross compiler.
Annoyingly this will cause the closure of any cross compiled derivations to include GCC. Splitting the cross compiler and its libraries into separate derivations may solve this (I think this happens for native packages)
CC @Ericson2314