GenerateExportHeader: Add option to specify custom content

Tests/Module/GenerateExportHeader/lib_shared_and_static/CMakeLists.txt

@@ -25,9 +25,12 @@ add_library(shared_variant SHARED ${lib_SRCS})
 set_target_properties(shared_variant PROPERTIES DEFINE_SYMBOL SHARED_VARIANT_MAKEDLL)
 add_library(static_variant ${lib_SRCS})
 
+set(MY_CUSTOM_CONTENT "#define MY_CUSTOM_CONTENT_ADDED")
+
 generate_export_header(shared_variant
   BASE_NAME libshared_and_static
   PREFIX_NAME MYPREFIX_
+  CUSTOM_CONTENT_FROM_VARIABLE MY_CUSTOM_CONTENT
 )
 
 set_target_properties(static_variant PROPERTIES COMPILE_FLAGS -DLIBSHARED_AND_STATIC_STATIC_DEFINE)

Tests/Module/GenerateExportHeader/lib_shared_and_static/libshared_and_static.cpp

@@ -1,6 +1,10 @@
 
 #include "libshared_and_static.h"
 
+#ifndef MY_CUSTOM_CONTENT_ADDED
+# error "MY_CUSTOM_CONTENT_ADDED not defined!"
+#endif
+
 int LibsharedAndStatic::libshared_and_static() const
 {
   return 0;