core/compiler: add shared/static linkage definitions

- BR_BUILD_SHARED - defined to 1 if building shared
- BR_BUILD_STATIC - defined to 1 if building static
- BR_EXPORTS      - defined to 1 if exporting
- BR_API_EXPORT   - defined to BR_DLL_EXPORT if shared
- BR_API_IMPORT   - defined to BR_DLL_IMPORT if static
- BR_API          - defined to one of BR_DLL_{EXPORT,IMPORT} depending
  on BR_EXPORTS.

Author: vs49688

core/CMakeLists.txt

@@ -20,6 +20,7 @@ set(BRENDER_OBJECTS)
 
 foreach (target ${BRENDER_TARGETS})
     add_subdirectory(${target})
+    target_compile_definitions(${target} PRIVATE -DBR_EXPORTS=1)
     list(APPEND BRENDER_OBJECTS "$<TARGET_OBJECTS:${target}>")
 endforeach ()
 
@@ -33,6 +34,15 @@ endforeach ()
 ##
 add_library(brender)
 
+get_target_property(target_type brender TYPE)
+if(target_type STREQUAL SHARED_LIBRARY)
+    target_compile_definitions(brender-inc INTERFACE -DBR_BUILD_STATIC=0)
+    target_compile_definitions(brender-inc INTERFACE -DBR_BUILD_SHARED=1)
+else()
+    target_compile_definitions(brender-inc INTERFACE -DBR_BUILD_STATIC=1)
+    target_compile_definitions(brender-inc INTERFACE -DBR_BUILD_SHARED=0)
+endif()
+
 ##
 # Link all the subtargets privately so our consumers don't inherit their
 # includes, which pulls in DDI.

core/inc/compiler.h

@@ -9,6 +9,28 @@
 #ifndef _COMPILER_H_
 #define _COMPILER_H_
 
+/*
+ * Defined to 1 if built as a shared library.
+ */
+#if !defined(BR_BUILD_SHARED)
+#define BR_BUILD_SHARED 0
+#endif
+
+/*
+ * Defined to 1 if built as a static library.
+ */
+#if !defined(BR_BUILD_STATIC)
+#define BR_BUILD_STATIC 0
+#endif
+
+#if(!BR_BUILD_SHARED && !BR_BUILD_STATIC) || (BR_BUILD_SHARED && BR_BUILD_STATIC)
+#error Invalid linkage configuration
+#endif
+
+#if !defined(BR_EXPORTS)
+#define BR_EXPORTS 0
+#endif
+
 #if defined(__H2INC__)
 typedef signed char    int8_t;
 typedef signed short   int16_t;
@@ -218,6 +240,25 @@ typedef float br_float;
 
 #define BR_STR(s) #s
 
+/*
+ * Handle static/shared library stuff.
+ */
+#if BR_BUILD_SHARED
+#define BR_API_EXPORT BR_DLL_EXPORT
+#define BR_API_IMPORT BR_DLL_IMPORT
+#endif
+
+#if BR_BUILD_STATIC
+#define BR_API_EXPORT
+#define BR_API_IMPORT
+#endif
+
+#if BR_EXPORTS
+#define BR_API BR_API_EXPORT
+#else
+#define BR_API BR_API_IMPORT
+#endif
+
 #if defined(__H2INC__)
 /*
  * Avoid some tokens that masm chokes on