On Thu, Nov 5, 2020 at 2:20 PM Peter Eisentraut < peter.eisentr...@2ndquadrant.com> wrote:
> On 2020-11-05 12:59, John Naylor wrote: > > I think we're talking past eachother. Here's a concrete example: > > > > #define BKI_ROWTYPE_OID(oid,oidmacro) > > #define DECLARE_TOAST(name,toastoid,indexoid) extern int no_such_variable > > > > I understand these to be functionally equivalent as far as what the C > > compiler sees. > > The issue is that you can't have a bare semicolon at the top level of a > C compilation unit, at least on some compilers. So doing > > #define FOO(stuff) /*empty*/ > > and then > > FOO(123); > > won't work. You need to fill the definition of FOO with some stuff to > make it valid. > > BKI_ROWTYPE_OID on the other hand is not used at the top level like > this, so it can be defined to empty. > Thank you for the explanation. -- John Naylor EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
