PostgreSQL C Language Extension with C++ Code

Hi,

I've searched information about my problem in the archives and on the
internet, but it didn't help. I have this small myfunc.cpp

1:   #include <postgres.h>
2:   #include <utils/rel.h>
3:   #include <postgres.h>
4:   #include <fmgr.h>
5:   #include <utils/array.h>
6:   #include <utils/builtins.h>
7:   #include <catalog/pg_type.h>
8:   #include <string>
9:   #include <vector>
10: #include <stdlib.h>
11: #include <stdint.h>
12: #include <iostream>
13: #include <fstream>
14: #include <seal/seal.h> // external compiled c++ library linked on
running 'make'
15:
16: #ifdef PG_MODULE_MAGIC
17: PG_MODULE_MAGIC;
18: #endif
19: 
20: Datum sum_of_numbers(PG_FUNCTION_ARGS);
21: PG_FUNCTION_INFO_V1(sum_of_numbers);
22: 
23: extern "C" {
24:         int64_t sum_of_numbers(){
25:                 std::vector<int64_t> numbers {23, 445, 64};
26:                 auto sum = 0;
27:                 for (auto &item : numbers){
28:                         sum += item;
29:                 }
30:                 return sum;
31:         }
32: }

And I compile without any problem suing this Makefiles:

1:   MODULES = myfunc
2: 
3:   PG_CONFIG = /usr/pgsql-10/bin/pg_config
4:   PGXS = $(shell $(PG_CONFIG) --pgxs)
5:   INCLUDEDIR = $(shell $(PG_CONFIG) --includedir-server)
6:   INCLUDE_SEAL = /usr/local/include/seal
7:   INCLUDE_SEAL_LIB = /usr/local/lib/libseal.a
8:   INCLUDE_CPPCODEC = /usr/local/include/cppcodec
9:   #CFLAGS = -std=c11
10: #CFLAGS = --std=c++14 -fPIC -Wall -Werror -g3 -O0
11: include $(PGXS)
12: myfunc.so: myfunc.o
13:         g++ -shared -o myfunc.so myfunc.o
14: 
16: myfunc.o: myfunc.cpp
17:        g++ --std=c++17 -fPIC -Wall -Werror -g3 -O0 -o myfunc.o -c
myfunc.cpp -I$(INCLUDEDIR) -L$(INCLUDE_SEAL_LIB) -I$(INCLUDE_SEAL)
-I$(INCLUDE_CPPCODEC)
18: 

After copying the myfunc.so file to the PostgreSQL lib folder and executing:

1: CREATE OR REPLACE FUNCTION 
2:    sum_of_numbers() RETURNS integer AS 'myfunc' 
3: LANGUAGE C STRICT;

I get this error:
*ERROR:  incompatible library "/usr/pgsql-10/lib/myfunc.so": missing magic
block
HINT:  Extension libraries are required to use the PG_MODULE_MAGIC macro.
SQL state: XX000*

I've added the files and line numbers for an easier discussion.

Thanks a lot,
Tal

myfunc.cpp <http://www.postgresql-archive.org/file/t351748/myfunc.cpp>  
Makefiles.Makefiles
<http://www.postgresql-archive.org/file/t351748/Makefiles.Makefiles>  



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