feat: compat with pg 16 (#108)

According to https://www.postgresql.org/docs/current/release-16.html.

"Functions that need to be called from the core backend or other extensions must now be
explicitly marked PGDLLEXPORT."

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
  runs-on: ubuntu-latest
  strategy:
  matrix:
- pg-version: ['12', '13', '14', '15']
+ pg-version: ['12', '13', '14', '15', '16']
 
  steps:
  - uses: actions/checkout@v1

shell.nix

@@ -12,15 +12,21 @@ let
  sha256 = "1h8c0mk6jlxdmjqch6ckj30pax3hqh6kwjlvp2021x3z4pdzrn9p";
  };
  newPkgs = (import (builtins.fetchTarball {
- name = "2022-10-14";
- url = "https:/NixOS/nixpkgs/archive/cc090d2b942f76fad83faf6e9c5ed44b73ba7114.tar.gz";
- sha256 = "0a1wwpbn2f38pcays6acq1gz19vw4jadl8yd3i3cd961f1x2vdq2";
+ name = "2023-09-16";
+ url = "https:/NixOS/nixpkgs/archive/ae5b96f3ab6aabb60809ab78c2c99f8dd51ee678.tar.gz";
+ sha256 = "11fpdcj5xrmmngq0z8gsc3axambqzvyqkfk23jn3qkx9a5x56xxk";
  }){});
 in with import nixpkgs {};
 mkShell {
  buildInputs =
  let
- supportedPgVersions = [ postgresql_12 postgresql_13 newPkgs.postgresql_14 newPkgs.postgresql_15 ];
+ supportedPgVersions = [
+ postgresql_12
+ postgresql_13
+ newPkgs.postgresql_14
+ newPkgs.postgresql_15
+ newPkgs.postgresql_16
+ ];
  pgWithExt = { pg }: pg.withPackages (p: [ (callPackage ./nix/pg_net.nix { postgresql = pg;}) ]);
  extAll = map (x: callPackage ./nix/pgScript.nix { postgresql = pgWithExt { pg = x;}; }) supportedPgVersions;
  valgrind-net-with-pg-12 = callPackage ./nix/pgValgrindScript.nix { postgresql = pgWithExt { pg = postgresql_12;}; };

src/worker.c

@@ -39,7 +39,7 @@ static int batch_size = 500;
 char* database_name = "postgres";
 
 void _PG_init(void);
-void worker_main(Datum main_arg) pg_attribute_noreturn();
+PGDLLEXPORT void worker_main(Datum main_arg) pg_attribute_noreturn();
 bool is_extension_loaded(void);
 
 typedef struct _CurlData