From 8b67a37f8bb84a2d7445a032a73dd96d3f05fd17 Mon Sep 17 00:00:00 2001
From: Ola x Nilsson <olani@axis.com>
Date: Thu, 7 Sep 2023 15:14:34 +0200
Subject: [PATCH] Add cfg option gnu_time64_abi

---
 build.rs | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/build.rs b/build.rs
index 787b8b86a236d..a259cfe967c2a 100644
--- a/build.rs
+++ b/build.rs
@@ -79,6 +79,11 @@ fn main() {
         Some(_) | None => (),
     }
 
+    // Some ABIs need to redirect time related symbols to their time64 equivalents.
+    if is_gnu_time64_abi() {
+        println!("cargo:rustc-cfg=gnu_time64_abi");
+    }
+
     // On CI: deny all warnings
     if libc_ci {
         set_cfg("libc_deny_warnings");
@@ -281,3 +286,32 @@ fn set_cfg(cfg: &str) {
     }
     println!("cargo:rustc-cfg={}", cfg);
 }
+
+fn is_gnu_time64_abi() -> bool {
+    match env::var("CARGO_CFG_TARGET_ENV") {
+        Ok(target_env) => {
+            if target_env != "gnu" {
+                return false;
+            }
+        },
+        Err(_) => panic!("CARGO_CFG_TARGET_ENV not set"),
+    }
+    match env::var("CARGO_CFG_TARGET_OS") {
+        Ok(target_os) => {
+            if target_os != "linux" {
+                return false;
+            }
+        },
+        Err(_) => panic!("CARGO_CFG_TARGET_OS not set"),
+    }
+    let _ptrbits = match env::var("CARGO_CFG_TARGET_POINTER_WIDTH") {
+        Ok(bits) => {
+            if bits == "64" {
+                return false;
+            }
+            bits
+        },
+        Err(_) => panic!("CARGO_CFG_TARGERT_POINTER_WIDTH not set"),
+    };
+    return false;
+}