Crash during configure without development SSL libraries installed

Incorrect usage of OPENSSL_INCLUDE_DIR variable within cmake caused the
configure step to fail. The variable was used before being checked if
the include directory actually existed.

Author: cvicentiu

cmake/ssl.cmake

@@ -156,37 +156,37 @@ MACRO (MYSQL_CHECK_SSL)
       LIST(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
     ENDIF()
 
-    # Verify version number. Version information looks like:
-    #   #define OPENSSL_VERSION_NUMBER 0x1000103fL
-    # Encoded as MNNFFPPS: major minor fix patch status
-    FILE(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h"
-      OPENSSL_VERSION_NUMBER
-      REGEX "^#define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x[0-9].*"
-    )
-    STRING(REGEX REPLACE
-      "^.*OPENSSL_VERSION_NUMBER[\t ]+0x([0-9]).*$" "\\1"
-      OPENSSL_MAJOR_VERSION "${OPENSSL_VERSION_NUMBER}"
-    )
-
     IF(OPENSSL_INCLUDE_DIR AND
        OPENSSL_LIBRARIES   AND
        CRYPTO_LIBRARY
       )
+      # Verify version number. Version information looks like:
+      #   #define OPENSSL_VERSION_NUMBER 0x1000103fL
+      # Encoded as MNNFFPPS: major minor fix patch status
+      FILE(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h"
+        OPENSSL_VERSION_NUMBER
+        REGEX "^#define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x[0-9].*"
+      )
+      STRING(REGEX REPLACE
+        "^.*OPENSSL_VERSION_NUMBER[\t ]+0x([0-9]).*$" "\\1"
+        OPENSSL_MAJOR_VERSION "${OPENSSL_VERSION_NUMBER}"
+      )
+      INCLUDE(CheckSymbolExists)
+      SET(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
+      CHECK_SYMBOL_EXISTS(SHA512_DIGEST_LENGTH "openssl/sha.h"
+                          HAVE_SHA512_DIGEST_LENGTH)
       SET(OPENSSL_FOUND TRUE)
     ELSE()
       SET(OPENSSL_FOUND FALSE)
     ENDIF()
 
-    MESSAGE(STATUS "OPENSSL_INCLUDE_DIR = ${OPENSSL_INCLUDE_DIR}")
-    MESSAGE(STATUS "OPENSSL_LIBRARIES = ${OPENSSL_LIBRARIES}")
-    MESSAGE(STATUS "CRYPTO_LIBRARY = ${CRYPTO_LIBRARY}")
-    MESSAGE(STATUS "OPENSSL_MAJOR_VERSION = ${OPENSSL_MAJOR_VERSION}")
-
-    INCLUDE(CheckSymbolExists)
-    SET(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-    CHECK_SYMBOL_EXISTS(SHA512_DIGEST_LENGTH "openssl/sha.h" 
-                        HAVE_SHA512_DIGEST_LENGTH)
     IF(OPENSSL_FOUND AND HAVE_SHA512_DIGEST_LENGTH)
+      MESSAGE(STATUS "OPENSSL_INCLUDE_DIR = ${OPENSSL_INCLUDE_DIR}")
+      MESSAGE(STATUS "OPENSSL_LIBRARIES = ${OPENSSL_LIBRARIES}")
+      MESSAGE(STATUS "CRYPTO_LIBRARY = ${CRYPTO_LIBRARY}")
+      MESSAGE(STATUS "OPENSSL_MAJOR_VERSION = ${OPENSSL_MAJOR_VERSION}")
+
+
       SET(SSL_SOURCES "")
       SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES} ${CRYPTO_LIBRARY})
       IF(CMAKE_SYSTEM_NAME MATCHES "SunOS")