From aefae11c0ddab2e47d2a00aee00a257f93b8ef30 Mon Sep 17 00:00:00 2001
From: Will Lillis <will.lillis24@gmail.com>
Date: Sat, 10 Jan 2026 04:20:16 -0500
Subject: [PATCH] fix(build): define `_BSD_SOURCE`

System endian conversion macros are gated behind this feature flag for
older versions of GLIBC. `_BSD_SOURCE` and `_SVID_SOURCE` were
deprecated and replaced with `_DEFAULT_SOURCE` starting with GLIBC 2.19.
---
 CMakeLists.txt                 | 2 +-
 Makefile                       | 2 +-
 Package.swift                  | 1 +
 build.zig                      | 1 +
 crates/xtask/src/build_wasm.rs | 1 +
 lib/binding_rust/build.rs      | 1 +
 6 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b40ac55a..f11895c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,7 +81,7 @@ set_target_properties(tree-sitter
                       SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
                       DEFINE_SYMBOL "")
 
-target_compile_definitions(tree-sitter PRIVATE _POSIX_C_SOURCE=200112L _DEFAULT_SOURCE _DARWIN_C_SOURCE)
+target_compile_definitions(tree-sitter PRIVATE _POSIX_C_SOURCE=200112L _DEFAULT_SOURCE _BSD_SOURCE _DARWIN_C_SOURCE)
 
 include(GNUInstallDirs)
 
diff --git a/Makefile b/Makefile
index d0b402f0..2098d275 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@ OBJ := $(SRC:.c=.o)
 ARFLAGS := rcs
 CFLAGS ?= -O3 -Wall -Wextra -Wshadow -Wpedantic -Werror=incompatible-pointer-types
 override CFLAGS += -std=c11 -fPIC -fvisibility=hidden
-override CFLAGS += -D_POSIX_C_SOURCE=200112L -D_DEFAULT_SOURCE -D_DARWIN_C_SOURCE
+override CFLAGS += -D_POSIX_C_SOURCE=200112L -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_DARWIN_C_SOURCE
 override CFLAGS += -Ilib/src -Ilib/src/wasm -Ilib/include
 
 # ABI versioning
diff --git a/Package.swift b/Package.swift
index a92d3d14..fb6c6e95 100644
--- a/Package.swift
+++ b/Package.swift
@@ -27,6 +27,7 @@ let package = Package(
                         .headerSearchPath("src"),
                         .define("_POSIX_C_SOURCE", to: "200112L"),
                         .define("_DEFAULT_SOURCE"),
+                        .define("_BSD_SOURCE"),
                         .define("_DARWIN_C_SOURCE"),
                 ]),
     ],
diff --git a/build.zig b/build.zig
index bd7a0721..9bb1e818 100644
--- a/build.zig
+++ b/build.zig
@@ -40,6 +40,7 @@ pub fn build(b: *std.Build) !void {
 
     lib.root_module.addCMacro("_POSIX_C_SOURCE", "200112L");
     lib.root_module.addCMacro("_DEFAULT_SOURCE", "");
+    lib.root_module.addCMacro("_BSD_SOURCE", "");
     lib.root_module.addCMacro("_DARWIN_C_SOURCE", "");
 
     if (wasm) {
diff --git a/crates/xtask/src/build_wasm.rs b/crates/xtask/src/build_wasm.rs
index 183718a6..fbb231ce 100644
--- a/crates/xtask/src/build_wasm.rs
+++ b/crates/xtask/src/build_wasm.rs
@@ -199,6 +199,7 @@ pub fn run_wasm(args: &BuildWasm) -> Result<()> {
         "-D", "NDEBUG=",
         "-D", "_POSIX_C_SOURCE=200112L",
         "-D", "_DEFAULT_SOURCE=",
+        "-D", "_BSD_SOURCE=",
         "-D", "_DARWIN_C_SOURCE=",
         "-I", "lib/src",
         "-I", "lib/include",
diff --git a/lib/binding_rust/build.rs b/lib/binding_rust/build.rs
index 624001bc..57c5bc94 100644
--- a/lib/binding_rust/build.rs
+++ b/lib/binding_rust/build.rs
@@ -49,6 +49,7 @@ fn main() {
         .include(&include_path)
         .define("_POSIX_C_SOURCE", "200112L")
         .define("_DEFAULT_SOURCE", None)
+        .define("_BSD_SOURCE", None)
         .define("_DARWIN_C_SOURCE", None)
         .warnings(false)
         .file(src_path.join("lib.c"))