openbsd.stand: init

This stand package builds all variants of OpenBSD's
`stand` bootloader, including both UEFI and BIOS versions.

This package will likely need changes if we ever support
`aarch64-openbsd`, but that isn't even a target yet.

Co-Authored-By: Audrey Dutcher <audrey@rhelmot.io>

pkgs/os-specific/bsd/openbsd/pkgs/stand.nix

@@ -0,0 +1,32 @@
+{
+  mkDerivation,
+  stdenv,
+  pkgsBuildTarget,
+}:
+
+mkDerivation {
+  path = "sys/arch/amd64/stand";
+  extraPaths = [ "sys" ];
+
+  # gcc compat
+  postPatch = ''
+    find $BSDSRCDIR -name Makefile -print0 | xargs -0 sed -E -i -e 's/-nopie/-no-pie/g'
+    substituteInPlace $BSDSRCDIR/sys/arch/*/stand/boot/check-boot.pl --replace-fail /usr/bin/objdump objdump
+    substituteInPlace $BSDSRCDIR/sys/arch/*/stand/Makefile --replace-quiet " boot " " " --replace-quiet " fdboot " " "
+  '';
+
+  # expects to be able to use unprefixed programs
+  # needs gnu assembler + objdump + objcopy
+  # this is really not designed for cross...
+  preBuild = ''
+    mkdir $TMP/bin
+    export PATH=$TMP/bin:$PATH
+    ln -s ${stdenv.cc}/bin/${stdenv.cc.targetPrefix}size $TMP/bin/size
+    ln -s ${pkgsBuildTarget.binutils}/bin/${pkgsBuildTarget.binutils.targetPrefix}as $TMP/bin/as
+    ln -s ${pkgsBuildTarget.binutils}/bin/${pkgsBuildTarget.binutils.targetPrefix}objdump $TMP/bin/objdump
+    ln -s ${pkgsBuildTarget.binutils}/bin/${pkgsBuildTarget.binutils.targetPrefix}objcopy $TMP/bin/objcopy
+    ln -s ${pkgsBuildTarget.binutils}/bin/${pkgsBuildTarget.binutils.targetPrefix}objcopy $TMP/bin/
+
+    export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -Wno-pointer-sign"
+  '';
+}