Handle OPENSSL_NO_COMP

Closes #459

2 files changed, 15 insertions, 0 deletions

diff --git a/openssl/build.rs b/openssl/build.rs
index 15d4b4db..dd832150 100644
--- a/openssl/build.rs
+++ b/openssl/build.rs
@@ -12,4 +12,9 @@ fn main() {
     if env::var("DEP_OPENSSL_IS_110").is_ok() {
         println!("cargo:rustc-cfg=ossl110");
     }
+    if let Ok(vars) = env::var("DEP_OPENSSL_OSSLCONF") {
+        for var in vars.split(",") {
+            println!("cargo:rustc-cfg=osslconf=\"{}\"", var);
+        }
+    }
 }
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index b042d81e..076ac400 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -952,6 +952,11 @@ impl<'a> SslRef<'a> {
     /// The result will be either None, indicating no compression is in use, or
     /// a string with the compression name.
     pub fn compression(&self) -> Option<String> {
+        self._compression()
+    }
+
+    #[cfg(not(osslconf = "OPENSSL_NO_COMP"))]
+    fn _compression(&self) -> Option<String> {
         let ptr = unsafe { ffi::SSL_get_current_compression(self.as_ptr()) };
         if ptr == ptr::null() {
             return None;
@@ -965,6 +970,11 @@ impl<'a> SslRef<'a> {
         Some(s)
     }
 
+    #[cfg(osslconf = "OPENSSL_NO_COMP")]
+    fn _compression(&self) -> Option<String> {
+        None
+    }
+
     /// Returns the server's name for the current connection
     pub fn servername(&self) -> Option<String> {
         let name = unsafe { ffi::SSL_get_servername(self.as_ptr(), ffi::TLSEXT_NAMETYPE_host_name) };