Demitri Muna <postgresql@xxxxxxxxxxx> writes: > I’m writing a C extension and have successfully based my Makefile on existing templates. This conveniently hides the details of 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 forbids mixed 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
