Add init for checksums (#501)

Author: DmitriyMusatkin

include/aws/s3/exports.h

@@ -6,7 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0.
  */
 
-#if defined(USE_WINDOWS_DLL_SEMANTICS) || defined(WIN32)
+#if defined(AWS_CRT_USE_WINDOWS_DLL_SEMANTICS) || defined(_WIN32)
 #    ifdef AWS_S3_USE_IMPORT_EXPORT
 #        ifdef AWS_S3_EXPORTS
 #            define AWS_S3_API __declspec(dllexport)
@@ -18,12 +18,12 @@
 #    endif /*USE_IMPORT_EXPORT */
 
 #else
-#    if ((__GNUC__ >= 4) || defined(__clang__)) && defined(AWS_S3_USE_IMPORT_EXPORT) && defined(AWS_S3_EXPORTS)
+#    if defined(AWS_S3_USE_IMPORT_EXPORT) && defined(AWS_S3_EXPORTS)
 #        define AWS_S3_API __attribute__((visibility("default")))
 #    else
 #        define AWS_S3_API
-#    endif /* __GNUC__ >= 4 || defined(__clang__) */
+#    endif
 
-#endif /* defined(USE_WINDOWS_DLL_SEMANTICS) || defined(WIN32) */
+#endif /* defined(AWS_CRT_USE_WINDOWS_DLL_SEMANTICS) || defined(_WIN32) */
 
 #endif /* AWS_S3_EXPORTS_H */

source/s3.c

@@ -9,6 +9,7 @@
 #include <aws/s3/s3_client.h>
 
 #include <aws/auth/auth.h>
+#include <aws/checksums/checksums.h>
 #include <aws/common/error.h>
 #include <aws/common/hash_table.h>
 #include <aws/http/http.h>
@@ -195,6 +196,7 @@ void aws_s3_library_init(struct aws_allocator *allocator) {
 
     aws_auth_library_init(s_library_allocator);
     aws_http_library_init(s_library_allocator);
+    aws_checksums_library_init(s_library_allocator);
 
     aws_register_error_info(&s_error_list);
     aws_register_log_subject_info_list(&s_s3_log_subject_list);
@@ -231,5 +233,6 @@ void aws_s3_library_clean_up(void) {
     aws_unregister_error_info(&s_error_list);
     aws_http_library_clean_up();
     aws_auth_library_clean_up();
+    aws_checksums_library_clean_up();
     s_library_allocator = NULL;
 }