diff --git a/include/fc/crypto/ripemd160.hpp b/include/fc/crypto/ripemd160.hpp
index 6e73917..389d677 100644
--- a/include/fc/crypto/ripemd160.hpp
+++ b/include/fc/crypto/ripemd160.hpp
@@ -45,7 +45,7 @@ class ripemd160
         ripemd160 result();
 
       private:
-        struct      impl;
+        class            impl;
         fc::fwd<impl,96> my;
     };
 
diff --git a/include/fc/exception/exception.hpp b/include/fc/exception/exception.hpp
index 1c1e7dc..ec100f4 100644
--- a/include/fc/exception/exception.hpp
+++ b/include/fc/exception/exception.hpp
@@ -446,11 +446,11 @@ namespace fc
    catch( fc::exception& er ) { \
       FC_RETHROW_EXCEPTION( er, LOG_LEVEL, FORMAT, __VA_ARGS__ ); \
    } catch( const std::exception& e ) {  \
-      fc::exception fce( \
+      throw fc::exception( \
                 FC_LOG_MESSAGE( LOG_LEVEL, "${what}: " FORMAT,__VA_ARGS__("what",e.what())), \
                 fc::std_exception_code,\
                 typeid(e).name(), \
-                e.what() ) ; throw fce;\
+                e.what() ) ;\
    } catch( ... ) {  \
       throw fc::unhandled_exception( \
                 FC_LOG_MESSAGE( LOG_LEVEL, FORMAT,__VA_ARGS__), \
@@ -461,11 +461,11 @@ namespace fc
    catch( fc::exception& er ) { \
       FC_RETHROW_EXCEPTION( er, warn, "", FC_FORMAT_ARG_PARAMS(__VA_ARGS__) ); \
    } catch( const std::exception& e ) {  \
-      fc::exception fce( \
+      throw fc::exception( \
                 FC_LOG_MESSAGE( warn, "${what}: ",FC_FORMAT_ARG_PARAMS(__VA_ARGS__)("what",e.what())), \
                 fc::std_exception_code,\
                 typeid(e).name(), \
-                e.what() ) ; throw fce;\
+                e.what() ) ;\
    } catch( ... ) {  \
       throw fc::unhandled_exception( \
                 FC_LOG_MESSAGE( warn, "",FC_FORMAT_ARG_PARAMS(__VA_ARGS__)), \
diff --git a/include/fc/log/log_message.hpp b/include/fc/log/log_message.hpp
index a320b66..e9e1a68 100644
--- a/include/fc/log/log_message.hpp
+++ b/include/fc/log/log_message.hpp
@@ -147,7 +147,7 @@ FC_REFLECT_TYPENAME( fc::log_message );
  * @param LOG_LEVEL - a valid log_level::Enum name.
  */
 #define FC_LOG_CONTEXT(LOG_LEVEL) \
-   fc::log_context( fc::log_level::LOG_LEVEL, __FILE__, __LINE__, __func__ )
+   fc::log_context( fc::log_level::LOG_LEVEL, (const char*)__FILE__, __LINE__, (const char*)__func__ )
 
 /**
  * @def FC_LOG_MESSAGE(LOG_LEVEL,FORMAT,...)
diff --git a/src/crypto/crc.cpp b/src/crypto/crc.cpp
index 3b95455..7fa8cb1 100644
--- a/src/crypto/crc.cpp
+++ b/src/crypto/crc.cpp
@@ -606,6 +606,8 @@ static const uint32_t crc_c[256] = {
 
 uint64_t _mm_crc32_u64(uint64_t a, uint64_t b )
 {
+    // Squelch warning about unusued variable crc_c
+    (void)(crc_c);
     return crc32cSlicingBy8(a, (unsigned char*)&b, sizeof(b)); 
 }
 /*
diff --git a/tests/crypto/bigint_test.cpp b/tests/crypto/bigint_test.cpp
index 5473b7a..0d983b3 100644
--- a/tests/crypto/bigint_test.cpp
+++ b/tests/crypto/bigint_test.cpp
@@ -46,7 +46,9 @@ BOOST_AUTO_TEST_CASE(bigint_test_2)
         BOOST_CHECK( bi_accu >= a_1 );
     } while ( bi_accu.log2() <= 128 );
 
-    bi_accu = bi_accu;
+    // Test self-assignment (a=a) has no effect, but throw in some arcanity to avoid a compiler warning
+    const volatile auto* bi_accu_self = &bi_accu;
+    bi_accu = const_cast<fc::bigint&>(*bi_accu_self);
 
     BOOST_CHECK( bi_accu && !bi_accu.is_negative() && bi_accu != bi_1 );
 
diff --git a/tests/io/json_tests.cpp b/tests/io/json_tests.cpp
index d56f801..90872e8 100644
--- a/tests/io/json_tests.cpp
+++ b/tests/io/json_tests.cpp
@@ -171,7 +171,7 @@ static bool equal( const fc::variant& a, const fc::variant& b )
          return true;
       case fc::variant::type_id::blob_type:
       default:
-         FC_THROW_EXCEPTION( fc::invalid_arg_exception, "Unsupported variant type: " + a.get_type() );
+         FC_THROW_EXCEPTION( fc::invalid_arg_exception, "Unsupported variant type: {t}", ( "t", a.get_type() ) );
     }
 }
 
@@ -348,7 +348,7 @@ BOOST_AUTO_TEST_CASE(rethrow_test)
       } FC_RETHROW_EXCEPTIONS( warn, "Argh! ${biggie}", ("biggie",biggie) ) };
    BOOST_CHECK_THROW( test_r(), fc::unknown_host_exception );
 
-   auto test_lr = [&biggie](){
+   auto test_lr = [](){
       try {
          FC_THROW_EXCEPTION( fc::unknown_host_exception, "WTF?" );
       } FC_LOG_AND_RETHROW() };