From 056761e53d4d1d81ca2340bd285bd6e38a0be601 Mon Sep 17 00:00:00 2001
From: Paho Lurie-Gregg <paho@paholg.com>
Date: Sat, 25 Dec 2021 09:55:02 -0800
Subject: [PATCH] Use hard-coded values in build script

---
 CHANGELOG.md  | 1 +
 build/main.rs | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98a560ad0..924dc4b1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The MSRV (Minimum Supported Rust Version) is 1.37.0, and typenum is tested
 against this Rust version.
 
 ### Unreleased
+- [fixed] Cross-compilation issue due to doing math in build script.
 
 ### 1.14.0 (2021-09-01)
 - [changed] Sealed all marker traits. Documentation already stated that these
diff --git a/build/main.rs b/build/main.rs
index a886ac3da..03c4697d4 100644
--- a/build/main.rs
+++ b/build/main.rs
@@ -80,8 +80,10 @@ pub fn no_std() {}
 fn main() {
     let highest: u64 = 1024;
 
-    let first2: u32 = (highest as f64).log(2.0).round() as u32 + 1;
-    let first10: u32 = (highest as f64).log(10.0) as u32 + 1;
+    // Use hardcoded values to avoid issues with cross-compilation.
+    // See https://github.com/paholg/typenum/issues/162
+    let first2: u32 = 11; // (highest as f64).log(2.0).round() as u32 + 1;
+    let first10: u32 = 4; // (highest as f64).log(10.0) as u32 + 1;
     let uints = (0..(highest + 1))
         .chain((first2..64).map(|i| 2u64.pow(i)))
         .chain((first10..20).map(|i| 10u64.pow(i)));