Add a semantic check level, e.g. check if a table really exists.

It would be nice if there was a alternative library using SPI functions

instead of libpq so we can write backend functions using ecpg.

Missing statements:

- exec sql ifdef

- exec sql allocate

- exec sql deallocate

- SQLSTATE

descriptor statements have the following shortcomings

- up to now the only reasonable statement is

FETCH ... INTO SQL DESCRIPTOR <name>

no input variables allowed!

Reason: to fully support dynamic SQL the frontend/backend communication

should change to recognize input parameters.

Since this is not likely to happen in the near future and you

can cover the same functionality with the existing infrastructure

I'll leave the work to someone else.

- string buffer overflow does not always generate warnings

(beware: terminating 0 may be missing because strncpy is used)

:var=data sets sqlwarn accordingly (but not indicator)

- char variables pointing to NULL are not allocated on demand

- string truncation does not show up in indicator

-DINCLUDE_PATH=\"$(HEADERDIR)\" -g

OBJ=preproc.o pgc.o type.o ecpg.o ecpg_keywords.o\

keywords.o c_keywords.o ../lib/typename.o

keywords.o c_keywords.o ../lib/typename.o descriptor.o variable.o

all:: ecpg