Print error on dlopen error

Author: antoyo

gccjit_sys/src/dynload.rs

@@ -4,13 +4,14 @@ pub use self::platform::Library;
 
 #[cfg(unix)]
 mod platform {
-    use std::ffi::{CStr, c_int, c_void};
+    use std::ffi::{CStr, c_char, c_int, c_void};
 
     #[link(name="dl")]
     extern "C" {
         fn dlopen(filename: *const i8, flag: c_int) -> *mut c_void;
         fn dlsym(handle: *mut c_void, symbol: *const i8) -> *mut c_void;
         fn dlclose(handle: *mut c_void) -> c_int;
+        fn dlerror() -> *const c_char;
     }
 
     pub struct Library(*mut c_void);
@@ -23,9 +24,13 @@ mod platform {
             const RTLD_NOW: c_int = 2;
             let handle = dlopen(path.as_ptr(), RTLD_NOW);
             if handle.is_null() {
+                let cstr = dlerror();
+                let cstr = CStr::from_ptr(cstr);
+                eprintln!("Dlerror: {:?}", cstr);
                 None
             }
             else {
+                eprintln!("Loading worked HERE");
                 Some(Self(handle))
             }
         }

src/lib.rs

@@ -125,7 +125,9 @@ fn with_lib<T, F: Fn(&Libgccjit) -> T>(callback: F) -> T {
 pub fn load(path: &CStr) -> bool {
     let lib =
         LIB.get_or_init(|| {
-            unsafe { Libgccjit::open(path) }
+            let lib = unsafe { Libgccjit::open(path) };
+            eprintln!("Is some: {}", lib.is_some());
+            lib
         });
     lib.is_some()
 }