Demitri Muna <postgresql@demitri.com> writes:
> I’m writing a C extension and have successfully based my Makefile on existing templates. This conveniently hides the
detailsof the full Makefile provided by "pg_config --pgxs”. Which variable would be the appropriate one to specify the
‘-std=c99’compiler flag? I’ve tried many and still get warnings that this flag should suppress (specifically, "ISO C90
forbidsmixed declarations and code”). These are the variables I currently define:
PG_CPPFLAGS ought to work. One point is that you need to set that before
including pgxs.mk; maybe it's an ordering problem?
regards, tom lane