Redo and enhance the support for building shared libraries. Currently

[openssl.git] / crypto / opensslv.h

diff --git a/crypto/opensslv.h b/crypto/opensslv.h
index 7fcc1ad417be9da901e23c134e445b1def3387cb..90b0fe2c02b7300128f7a2998897a03308191031 100644 (file)
--- a/crypto/opensslv.h
+++ b/crypto/opensslv.h
@@ -29,4 +29,57 @@
 #define OPENSSL_VERSION_TEXT   "OpenSSL 0.9.5b-dev 1 Apr 2000"
 #define OPENSSL_VERSION_PTEXT  " part of " OPENSSL_VERSION_TEXT
 
+
+/* The macros below are to be used for shared library (.so, .dll, ...)
+ * versioning.  That kind of versioning works a bit differently between
+ * operating systems.  The most usual scheme is to set a major and a minor
+ * number, and have the runtime loader check that the major number is equal
+ * to what it was at application link time, while the minor number has to
+ * be greater or equal to what it was at application link time.  With this
+ * scheme, the version number is usually part of the file name, like this:
+ *
+ *     libcrypto.so.0.9
+ *
+ * Some unixen also make a softlink with the major verson number only:
+ *
+ *     libcrypto.so.0
+ *
+ * On True64 it works a little bit differently.  There, the shared library
+ * version is stored in the file, and is actually a series of versions,
+ * separated by colons.  The rightmost version present in the library when
+ * linking an application is stored in the application to be matched at
+ * run time.  When the application is run, a check is done to see if the
+ * library version stored in the application matches any of the versions
+ * in the version string of the library itself.
+ * This version string can be constructed in any way, depending on what
+ * kind of matching is desired.  However, to implement the same scheme as
+ * the one used in the other unixen, all compatible versions, from lowest
+ * to highest, should be part of the string.  Consecutive builds would
+ * give the following versions strings:
+ *
+ *     3.0
+ *     3.0:3.1
+ *     3.0:3.1:3.2
+ *     4.0
+ *     4.0:4.1
+ *
+ * Notice how version 4 is completely incompatible with version, and
+ * therefore give the breach you can see.
+ *
+ * There may be other schemes as well that I haven't yet discovered.
+ *
+ * So, here's the way it works here: first of all, the library version
+ * number doesn't need at all to match the overall OpenSSL version.
+ * However, it's nice and more understandable if it actually does.
+ * The current library version is stored in the macro SHLIB_VERSION_NUMBER,
+ * which is just a piece of text in the format "M.m.e" (Major, minor, edit).
+ * For the sake of True64 and any other OS that behaves in similar ways,
+ * we need to keep a history of version numbers, which is done in the
+ * macro SHLIB_VERSION_HISTORY.  The numbers are separated by colons and
+ * should only keep the versions that are binary compatible with the current.
+ */
+#define SHLIB_VERSION_HISTORY ""
+#define SHLIB_VERSION_NUMBER "0.9.5b"
+
+
 #endif /* HEADER_OPENSSLV_H */