Use SERD_STATIC instead of SERD_SHARED to control visibility

For consistency, this seems to be the most common convention.

include/serd/serd.h

@@ -25,11 +25,11 @@
 #include <stdint.h>
 #include <stdio.h>
 
-#if defined(SERD_SHARED) && defined(SERD_INTERNAL) && defined(_WIN32)
+#if defined(_WIN32) && !defined(SERD_STATIC) && defined(SERD_INTERNAL)
 #  define SERD_API __declspec(dllexport)
-#elif defined(SERD_SHARED) && defined(_WIN32)
+#elif defined(_WIN32) && !defined(SERD_STATIC)
 #  define SERD_API __declspec(dllimport)
-#elif defined(SERD_SHARED) && defined(__GNUC__)
+#elif defined(__GNUC__)
 #  define SERD_API __attribute__((visibility("default")))
 #else
 #  define SERD_API

wscript

@@ -206,7 +206,7 @@ def build(bld):
             source          = lib_source,
             name            = 'libserd',
             target          = 'serd-%s' % SERD_MAJOR_VERSION,
-            defines         = defines + ['SERD_SHARED', 'SERD_INTERNAL'],
+            defines         = defines + ['SERD_INTERNAL'],
             **lib_args)
 
     # Static library
@@ -215,7 +215,7 @@ def build(bld):
             source          = lib_source,
             name            = 'libserd_static',
             target          = 'serd-%s' % SERD_MAJOR_VERSION,
-            defines         = defines + ['SERD_INTERNAL'],
+            defines         = defines + ['SERD_STATIC', 'SERD_INTERNAL'],
             **lib_args)
 
     if bld.env.BUILD_TESTS:
@@ -231,7 +231,7 @@ def build(bld):
             source       = lib_source,
             name         = 'libserd_profiled',
             target       = 'serd_profiled',
-            defines      = defines + ['SERD_INTERNAL'],
+            defines      = defines + ['SERD_STATIC', 'SERD_INTERNAL'],
             **test_args)
 
         # Test programs
@@ -247,7 +247,7 @@ def build(bld):
                 source       = prog[1],
                 use          = 'libserd_profiled',
                 target       = prog[0],
-                defines      = defines,
+                defines      = defines + ['SERD_STATIC'],
                 **test_args)
 
     # Utilities