From 4c2f1e01a7911f9f1d793156459d6df6c76edf68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sat, 10 May 2025 17:52:35 +0200
Subject: [PATCH] freebsd: Create strong references to __progname and environ
 in stub libc.so.

These symbols are defined in the statically-linked startup code. The real
libc.so.7 contains strong references to them, so they need to be put into the
dynamic symbol table.
---
 src/libs/freebsd.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/libs/freebsd.zig b/src/libs/freebsd.zig
index 9aa4066649..c7365ede4a 100644
--- a/src/libs/freebsd.zig
+++ b/src/libs/freebsd.zig
@@ -668,6 +668,25 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) anye
 
         try stubs_writer.writeAll(".data\n");
 
+        // FreeBSD's `libc.so.7` contains strong references to `__progname` and `environ` which are
+        // defined in the statically-linked startup code. Those references cause the linker to put
+        // the symbols in the dynamic symbol table. We need to create dummy references to them here
+        // to get the same effect.
+        if (std.mem.eql(u8, lib.name, "c")) {
+            try stubs_writer.print(
+                \\.balign {d}
+                \\.globl __progname
+                \\.globl environ
+                \\{s} __progname
+                \\{s} environ
+                \\
+            , .{
+                target.ptrBitWidth() / 8,
+                wordDirective(target),
+                wordDirective(target),
+            });
+        }
+
         const obj_inclusions_len = try inc_reader.readInt(u16, .little);
 
         var sizes = try arena.alloc(u16, metadata.all_versions.len);