cross work

freebsd-sysroot.nix

@@ -0,0 +1,58 @@
+{ stdenv
+, fetchzip
+, arch
+, version
+, sha256
+,
+}:
+stdenv.mkDerivation {
+  pname = "freebsd-sysroot";
+  version = "${version}-${arch}";
+  src = fetchzip {
+    url = "https://download.freebsd.org/ftp/releases/${arch}/${version}-RELEASE/base.txz";
+    stripRoot = false;
+    inherit sha256;
+  };
+
+  doBuild = false;
+  dontFixup = true;
+  installPhase = ''
+    # adapted from https://github.com/cross-rs/cross/blob/main/docker/freebsd.sh#L184
+
+    ls -l
+
+    mkdir -p $out/lib/
+    cp -r "usr/include" "$out"
+    cp -r "lib/"* "$out/lib"
+    cp "usr/lib/libc++.so" "$out/lib"
+    cp "usr/lib/libc++.a" "$out/lib"
+    cp "usr/lib/libcxxrt.a" "$out/lib"
+    cp "usr/lib/libcompiler_rt.a" "$out/lib"
+    cp "usr/lib"/lib{c,util,m,ssp_nonshared,memstat}.a "$out/lib"
+    cp "usr/lib/librt.so" "$out/lib"
+    cp "usr/lib"/lib{execinfo,procstat}.so.1 "$out/lib"
+    cp "usr/lib"/libmemstat.so.3 "$out/lib"
+    cp "usr/lib"/{crt1,Scrt1,crti,crtn}.o "$out/lib"
+    cp "usr/lib"/libkvm.a "$out/lib"
+
+    local lib=
+    local base=
+    local link=
+    for lib in "''${out}/lib/"*.so.*; do
+        base=$(basename "''${lib}")
+        link="''${base}"
+        # not strictly necessary since this will always work, but good fallback
+        while [[ "''${link}" == *.so.* ]]; do
+            link="''${link%.*}"
+        done
+
+        # just extra insurance that we won't try to overwrite an existing file
+        local dstlink="''${out}/lib/''${link}"
+        if [[ -n "''${link}" ]] && [[ "''${link}" != "''${base}" ]] && [[ ! -f "''${dstlink}" ]]; then
+            ln -s "''${base}" "''${dstlink}"
+        fi
+    done
+
+    ln -s libthr.so.3 "''${out}/lib/libpthread.so"
+  '';
+}