Avoid redefinition when vars are duplicated

tilpner · May 24, 2023 · a712864 · a712864
1 parent 4ae8679
commit a712864
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/sys/build.rs b/sys/build.rs
@@ -348,12 +348,14 @@ fn check_features(
  }
  includes_code.push_str(&format!(
  r#"
+ #ifndef {var}_is_defined
  #ifndef {var}
  #define {var} 0
  #define {var}_is_defined 0
  #else
  #define {var}_is_defined 1
  #endif
+ #endif
  "#,
  var = var
  ));