From 45d413494507daa33641bfc3650273a77c949e69 Mon Sep 17 00:00:00 2001
From: Emilio Cobos Álvarez <emilio@crisal.io>
Date: Sun, 23 Dec 2018 18:17:04 +0100
Subject: Add some diagnostics about which clang we find and which flags we
 derive from it.

---
 src/lib.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 2793182b..79c986c7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1734,11 +1734,15 @@ impl Bindings {
             }).cloned().collect::<Vec<_>>()
         };
 
+        debug!("Trying to find clang with flags: {:?}", clang_args_for_clang_sys);
+
         // TODO: Make this path fixup configurable?
         if let Some(clang) = clang_sys::support::Clang::find(
             None,
             &clang_args_for_clang_sys,
         ) {
+            debug!("Found clang: {:?}", clang);
+
             // If --target is specified, assume caller knows what they're doing
             // and don't mess with include paths for them
             let has_target_arg = options
@@ -1798,6 +1802,8 @@ impl Bindings {
             options.clang_args.push(f.name.to_str().unwrap().to_owned())
         }
 
+        debug!("Fixed-up options: {:?}", options);
+
         let time_phases = options.time_phases;
         let mut context = BindgenContext::new(options);
 
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