From 6debfc58566f035d51a79714e30a8cf1eea42f84 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Fri, 6 Dec 2024 14:06:42 -0600
Subject: [PATCH] Scope `libatomic` allowance to MIPS on Python 3.13

---
 cpython-unix/build.py | 10 ++++++++--
 src/validation.rs     |  8 +++++---
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/cpython-unix/build.py b/cpython-unix/build.py
index a0aaa470..1c1963bb 100755
--- a/cpython-unix/build.py
+++ b/cpython-unix/build.py
@@ -59,7 +59,6 @@
     "pthread",
     "rt",
     "util",
-    "atomic",
 }
 MACOS_ALLOW_SYSTEM_LIBRARIES = {"dl", "m", "pthread"}
 MACOS_ALLOW_FRAMEWORKS = {"CoreFoundation"}
@@ -543,6 +542,13 @@ def python_build_info(
 
     bi["object_file_format"] = object_file_format
 
+    # Determine allowed libaries on Linux
+    mips = target_triple.split("-")[0] in {"mips", "mipsel"}
+    linux_allowed_system_libraries = LINUX_ALLOW_SYSTEM_LIBRARIES.copy()
+    if mips and version == "3.13":
+        # See https://github.com/indygreg/python-build-standalone/issues/410
+        linux_allowed_system_libraries.add("atomic")
+
     # Add in core linking annotations.
     libs = extra_metadata["python_config_vars"].get("LIBS", "").split()
     skip = False
@@ -554,7 +560,7 @@ def python_build_info(
         if lib.startswith("-l"):
             lib = lib[2:]
 
-            if platform == "linux64" and lib not in LINUX_ALLOW_SYSTEM_LIBRARIES:
+            if platform == "linux64" and lib not in linux_allowed_system_libraries:
                 raise Exception("unexpected library in LIBS (%s): %s" % (libs, lib))
             elif platform == "macos" and lib not in MACOS_ALLOW_SYSTEM_LIBRARIES:
                 raise Exception("unexpected library in LIBS (%s): %s" % (libs, lib))
diff --git a/src/validation.rs b/src/validation.rs
index 128d78e6..2d498635 100644
--- a/src/validation.rs
+++ b/src/validation.rs
@@ -68,7 +68,6 @@ const ELF_ALLOWED_LIBRARIES: &[&str] = &[
     "libpthread.so.0",
     "librt.so.1",
     "libutil.so.1",
-    "libatomic.so.1",
 ];
 
 const PE_ALLOWED_LIBRARIES: &[&str] = &[
@@ -223,8 +222,11 @@ static ELF_ALLOWED_LIBRARIES_BY_TRIPLE: Lazy<HashMap<&'static str, Vec<&'static
                 vec!["ld-linux-armhf.so.3", "libgcc_s.so.1"],
             ),
             ("i686-unknown-linux-gnu", vec!["ld-linux-x86-64.so.2"]),
-            ("mips-unknown-linux-gnu", vec!["ld.so.1"]),
-            ("mipsel-unknown-linux-gnu", vec!["ld.so.1"]),
+            ("mips-unknown-linux-gnu", vec!["ld.so.1", "libatomic.so.1"]),
+            (
+                "mipsel-unknown-linux-gnu",
+                vec!["ld.so.1", "libatomic.so.1"],
+            ),
             ("mips64el-unknown-linux-gnuabi64", vec![]),
             ("ppc64le-unknown-linux-gnu", vec!["ld64.so.1", "ld64.so.2"]),
             ("s390x-unknown-linux-gnu", vec!["ld64.so.1"]),