Add visibility rules.
This change marks public symbols as dynamically exported. This means
that it becomes viable to build a shared library of libcrypto and libssl
with -fvisibility=hidden.
On Windows, one not only needs to mark functions for export in a
component, but also for import when using them from a different
component. Because of this we have to build with
|BORINGSSL_IMPLEMENTATION| defined when building the code. Other
components, when including our headers, won't have that defined and then
the |OPENSSL_EXPORT| tag becomes an import tag instead. See the #defines
in base.h
In the asm code, symbols are now hidden by default and those that need
to be exported are wrapped by a C function.
In order to support Chromium, a couple of libssl functions were moved to
ssl.h from ssl_locl.h: ssl_get_new_session and ssl_update_cache.
Change-Id: Ib4b76e2f1983ee066e7806c24721e8626d08a261
Reviewed-on: https://boringssl-review.googlesource.com/1350
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/base.h b/include/openssl/base.h
index 25329c9..4bc10e5 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -53,6 +53,9 @@
#ifndef OPENSSL_HEADER_BASE_H
#define OPENSSL_HEADER_BASE_H
+
+/* This file should be the first included by all BoringSSL headers. */
+
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
@@ -86,11 +89,38 @@
#define OPENSSL_APPLE
#endif
+#if defined(WIN32)
+#define OPENSSL_WINDOWS
+#endif
+
#define OPENSSL_IS_BORINGSSL
#define OPENSSL_VERSION_NUMBER 0x10002000
+#if defined(BORINGSSL_SHARED_LIBRARY)
-/* This file should be the first included by all BoringSSL headers. */
+#if defined(OPENSSL_WINDOWS)
+
+#if defined(BORINGSSL_IMPLEMENTATION)
+#define OPENSSL_EXPORT __declspec(dllexport)
+#else
+#define OPENSSL_EXPORT __declspec(dllimport)
+#endif
+
+#else /* defined(OPENSSL_WINDOWS) */
+
+#if defined(BORINGSSL_IMPLEMENTATION)
+#define OPENSSL_EXPORT __attribute__((visibility("default")))
+#else
+#define OPENSSL_EXPORT
+#endif
+
+#endif /* defined(OPENSSL_WINDOWS) */
+
+#else /* defined(BORINGSSL_SHARED_LIBRARY) */
+
+#define OPENSSL_EXPORT
+
+#endif /* defined(BORINGSSL_SHARED_LIBRARY) */
typedef int ASN1_BOOLEAN;
typedef int ASN1_NULL;