From d6ece7e94aa4253f8c32e81707d87f4280587e6d Mon Sep 17 00:00:00 2001
From: Artemis Tosini <me@artem.ist>
Date: Thu, 24 Oct 2024 21:24:47 +0000
Subject: [PATCH 1/2] Fix OpenBSD build with Makefiles

OpenBSD dynamic libraries never link to libc directly.
Instead, they have undefined symbols for all libc functions they use
that ld.so resolves to the libc referred to in the main executable.

Thus, disallowing undefined symbols will always fail

(cherry picked from commit c49bff2434971d693b03525622082a81b5ed75eb)
---
 mk/libraries.mk | 4 +++-
 mk/platform.mk  | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/mk/libraries.mk b/mk/libraries.mk
index b99ba2782..a7848ba35 100644
--- a/mk/libraries.mk
+++ b/mk/libraries.mk
@@ -86,7 +86,9 @@ define build-library
     else
       ifndef HOST_DARWIN
         ifndef HOST_WINDOWS
-          $(1)_LDFLAGS += -Wl,-z,defs
+	  ifndef HOST_OPENBSD
+            $(1)_LDFLAGS += -Wl,-z,defs
+          endif
         endif
       endif
     endif
diff --git a/mk/platform.mk b/mk/platform.mk
index 22c114a20..3c4fff780 100644
--- a/mk/platform.mk
+++ b/mk/platform.mk
@@ -21,6 +21,10 @@ ifdef HOST_OS
     HOST_NETBSD = 1
     HOST_UNIX = 1
   endif
+  ifeq ($(patsubst openbsd%,,$(HOST_KERNEL)),)
+    HOST_OPENBSD = 1
+    HOST_UNIX = 1
+  endif
   ifeq ($(HOST_KERNEL), linux)
     HOST_LINUX = 1
     HOST_UNIX = 1

From 0ae90918db12f7cf20f40216460c8eba91004a78 Mon Sep 17 00:00:00 2001
From: Artemis Tosini <me@artem.ist>
Date: Sat, 26 Oct 2024 16:46:32 +0000
Subject: [PATCH 2/2] package.nix: Disable GC on OpenBSD

Nix fails to build on OpenBSD with a linking error due to a non-found
symbol in boehm-gc. Just disable the GC until we can find a proper
workaround.

(cherry picked from commit fecc1ca2055ee590d8b957830f70512fcecbfe4b)
---
 package.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package.nix b/package.nix
index a7c8923e8..e1b4aebb0 100644
--- a/package.nix
+++ b/package.nix
@@ -75,7 +75,9 @@
 #
 # Temporarily disabled on Windows because the `GC_throw_bad_alloc`
 # symbol is missing during linking.
-, enableGC ? !stdenv.hostPlatform.isWindows
+#
+# Disabled on OpenBSD because of missing `_data_start` symbol while linking
+, enableGC ? !stdenv.hostPlatform.isWindows && !stdenv.hostPlatform.isOpenBSD
 
 # Whether to enable Markdown rendering in the Nix binary.
 , enableMarkdown ? !stdenv.hostPlatform.isWindows