glib-mkenums: feature use of previous symbols in evaluation
Enum symbols can be defined with a value computed from previously defined enum symbols. The current evaluator does not support this and requires a literal integer expression.
This commit introduces a C symbol namespace that is filled along code generation and provided as a local namespace for new symbols evaluation, effectively allowing definitions such as:
typedef enum {
a = 4;
b = a + 2;
} myenum;
to be successfully processed.