Fix static build.

If you want to link against the static library you have to define
LIBSSH_STATIC and link against ssh_static.

gcc -static -DLIBSSH_STATIC -lssh_static foo.c -o foo

include/libssh/libssh.h

@@ -22,25 +22,29 @@
 #ifndef _LIBSSH_H
 #define _LIBSSH_H
 
-#if defined _WIN32 || defined __CYGWIN__
+#ifdef LIBSSH_STATIC
-  #ifdef SSH_EXPORTS
+  #define LIBSSH_API
-    #ifdef __GNUC__
-      #define LIBSSH_API __attribute__((dllexport))
-    #else
-      #define LIBSSH_API __declspec(dllexport)
-    #endif
-  #else
-    #ifdef __GNUC__
-      #define LIBSSH_API __attribute__((dllimport))
-    #else
-      #define LIBSSH_API __declspec(dllimport)
-    #endif
-  #endif
 #else
-  #if __GNUC__ >= 4
+  #if defined _WIN32 || defined __CYGWIN__
-    #define LIBSSH_API __attribute__((visibility("default")))
+    #ifdef LIBSSH_EXPORTS
+      #ifdef __GNUC__
+        #define LIBSSH_API __attribute__((dllexport))
+      #else
+        #define LIBSSH_API __declspec(dllexport)
+      #endif
+    #else
+      #ifdef __GNUC__
+        #define LIBSSH_API __attribute__((dllimport))
+      #else
+        #define LIBSSH_API __declspec(dllimport)
+      #endif
+    #endif
   #else
-    #define LIBSSH_API
+    #if __GNUC__ >= 4
+      #define LIBSSH_API __attribute__((visibility("default")))
+    #else
+      #define LIBSSH_API
+    #endif
   #endif
 #endif
 

libssh/CMakeLists.txt

@@ -156,10 +156,8 @@ set_target_properties(
         ${LIBRARY_SOVERSION}
       OUTPUT_NAME
         ssh
-      CLEAN_DIRECT_OUTPUT
-        1
       DEFINE_SYMBOL
-        SSH_EXPORTS
+        LIBSSH_EXPORTS
       COMPILE_FLAGS
         ${LIBSSH_SHARED_CFLAGS}
 )
@@ -183,10 +181,8 @@ if (WITH_STATIC_LIB)
           ${LIBRARY_VERSION}
         SOVERSION
           ${LIBRARY_SOVERSION}
-        OUTPUT_NAME
+        COMPILE_FLAGS
-          ssh
+          "-DLIBSSH_STATIC"
-        CLEAN_DIRECT_OUTPUT
-          1
   )
 
   install(