From 92b12900ab0f90d66e455ff00e1edbe724c83f6d Mon Sep 17 00:00:00 2001
From: Nikola Pajkovsky <nikola.pajkovsky@livesporttv.cz>
Date: Fri, 15 May 2020 09:06:25 +0200
Subject: [PATCH] fix multiple redefined values on linux build

841  | pub const FP_ZERO: u32 = 2;
     | --------------------------- previous definition of the value `FP_ZERO` here
...
8117 | pub const FP_ZERO: _bindgen_ty_2 = 2;
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `FP_ZERO` redefined here

Signed-off-by: Nikola Pajkovsky <nikola.pajkovsky@livesporttv.cz>
---
 Cargo.toml |  2 +-
 build.rs   | 45 ++++++++++++++++++++++++++++++++++-----------
 2 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index e437064..ed02b12 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,5 +14,5 @@ build = "build.rs"
 libc = ">=0.2"
 
 [build-dependencies]
-bindgen = "0.31"
+bindgen = "0.52.0"
 pkg-config = ">=0.3"
diff --git a/build.rs b/build.rs
index 1e28793..76ca580 100644
--- a/build.rs
+++ b/build.rs
@@ -87,6 +87,37 @@ fn main() {
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
     let bindings_path_str = out_dir.join("bindings.rs");
 
+    #[derive(Debug)]
+    struct IgnoreMacros(HashSet<String>);
+
+    impl bindgen::callbacks::ParseCallbacks for IgnoreMacros {
+        fn will_parse_macro(&self, name: &str) -> bindgen::callbacks::MacroParsingBehavior {
+            if self.0.contains(name) {
+                bindgen::callbacks::MacroParsingBehavior::Ignore
+            } else {
+                bindgen::callbacks::MacroParsingBehavior::Default
+            }
+        }
+    }
+
+    let ignored_macros = IgnoreMacros(
+        vec![
+            "FP_INFINITE".into(),
+            "FP_NAN".into(),
+            "FP_NORMAL".into(),
+            "FP_SUBNORMAL".into(),
+            "FP_ZERO".into(),
+            "IPPORT_RESERVED".into(),
+            "FP_INT_UPWARD".into(),
+            "FP_INT_DOWNWARD".into(),
+            "FP_INT_TOWARDZERO".into(),
+            "FP_INT_TONEARESTFROMZERO".into(),
+            "FP_INT_TONEAREST".into(),
+        ]
+        .into_iter()
+        .collect(),
+    );
+
     if !Path::new(&bindings_path_str).exists() {
         // Create the header file that rust-bindgen needs as input.
         let gen_h_path = out_dir.join("gen.h");
@@ -101,17 +132,9 @@ fn main() {
             .ctypes_prefix("libc")
             .raw_line("extern crate libc;")
             .header(gen_h_path.to_str().unwrap())
-            // https://github.com/rust-lang-nursery/rust-bindgen/issues/687
-            .blacklist_type("FP_NAN")
-            .blacklist_type("FP_INFINITE")
-            .blacklist_type("FP_ZERO")
-            .blacklist_type("FP_SUBNORMAL")
-            .blacklist_type("FP_NORMAL")
-            .blacklist_type("FP_INT_UPWARD")
-            .blacklist_type("FP_INT_DOWNWARD")
-            .blacklist_type("FP_INT_TOWARDZERO")
-            .blacklist_type("FP_INT_TONEARESTFROMZERO")
-            .blacklist_type("FP_INT_TONEAREST");
+            .parse_callbacks(Box::new(ignored_macros))
+            .blacklist_type("timex")
+            .blacklist_function("clock_adjtime");
 
         for d in include_dirs {
             builder = builder.clang_arg(format!("-I{}", d.to_string_lossy()));