make.sh

#!/bin/sh                                              
                                                       
export PGROOT=/home/ecarroll/code/postgres/            
                                                       
gcc \                                                  
    -I "$PGROOT/src/include/"                         \
    -I "$PGROOT/src/interfaces/ecpg"                  \
    -I "$PGROOT/src/interfaces/ecpg/include"          \
  ./test.c \                                           
  -o a.out                                             

output

In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:314:57: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   DecodeInterval(char **, int *, int, int *, struct tm *, fsec_t *);
                                                         ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:315:40: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   DecodeTime(char *, int *, struct tm *, fsec_t *);
                                        ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:316:29: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str, bool EuroDates);
                             ^~
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:317:29: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   EncodeInterval(struct tm *tm, fsec_t fsec, int style, char *str);
                             ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:318:27: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   tm2timestamp(struct tm *, fsec_t, int *, timestamp *);
                           ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:321:29: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   EncodeDateOnly(struct tm *tm, int style, char *str, bool EuroDates);
                             ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:322:27: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   GetEpochTime(struct tm *);
                           ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:324:57: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 int   DecodeDateTime(char **, int *, int, int *, struct tm *, fsec_t *, bool);
                                                         ^~
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:326:33: warning: ‘struct tm’ declared inside parameter list will not be visible outside of this definition or declaration
 void  GetCurrentDateTime(struct tm *);
                                 ^~
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:42:1: error: conflicting types for ‘tm2timestamp’
 tm2timestamp(struct tm *tm, fsec_t fsec, int *tzp, timestamp * result)
 ^~~~~~~~~~~~
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:318:7: note: previous declaration of ‘tm2timestamp’ was here
 int   tm2timestamp(struct tm *, fsec_t, int *, timestamp *);
       ^~~~~~~~~~~~
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c: In function ‘SetEpochTimestamp’:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:80:19: warning: passing argument 1 of ‘GetEpochTime’ from incompatible pointer type [-Wincompatible-pointer-types]
  if (GetEpochTime(tm) < 0)
                   ^~
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:322:7: note: expected ‘struct tm *’ but argument is of type ‘struct tm *’
 int   GetEpochTime(struct tm *);
       ^~~~~~~~~~~~
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c: In function ‘PGTYPEStimestamp_from_asc’:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:231:44: warning: passing argument 5 of ‘DecodeDateTime’ from incompatible pointer type [-Wincompatible-pointer-types]
   DecodeDateTime(field, ftype, nf, &dtype, tm, &fsec, 0) != 0)
                                            ^~
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:324:7: note: expected ‘struct tm *’ but argument is of type ‘struct tm *’
 int   DecodeDateTime(char **, int *, int, int *, struct tm *, fsec_t *, bool);
       ^~~~~~~~~~~~~~
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c: In function ‘PGTYPEStimestamp_to_asc’:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:291:18: warning: passing argument 1 of ‘EncodeDateTime’ from incompatible pointer type [-Wincompatible-pointer-types]
   EncodeDateTime(tm, fsec, false, 0, NULL, DateStyle, buf, 0);
                  ^~
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:316:7: note: expected ‘struct tm *’ but argument is of type ‘struct tm *’
 int   EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str, bool EuroDates);
       ^~~~~~~~~~~~~~
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c: In function ‘PGTYPEStimestamp_current’:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:305:21: warning: passing argument 1 of ‘GetCurrentDateTime’ from incompatible pointer type [-Wincompatible-pointer-types]
  GetCurrentDateTime(&tm);
                     ^
In file included from ./test.c:2:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/dt.h:326:7: note: expected ‘struct tm *’ but argument is of type ‘struct tm *’
 void  GetCurrentDateTime(struct tm *);
       ^~~~~~~~~~~~~~~~~~
./test.c: In function ‘main’:
./test.c:16:16: warning: passing argument 1 of ‘timestamp2tm’ makes integer from pointer without a cast [-Wint-conversion]
  timestamp2tm( &t1, NULL, tm, &fsec, NULL );
                ^
In file included from ./test.c:6:0:
/home/ecarroll/code/postgres//src/interfaces/ecpg/pgtypeslib/timestamp.c:99:1: note: expected ‘timestamp {aka long int}’ but argument is of type ‘timestamp * {aka long int *}’
 timestamp2tm(timestamp dt, int *tzp, struct tm *tm, fsec_t *fsec, const char **tzn)
 ^~~~~~~~~~~~

test.c

#include "postgres_fe.h"
#include "pgtypeslib/dt.h"
#include "pgtypeslib/extern.h"
#include "pgtypes_timestamp.h"

#include "pgtypeslib/timestamp.c"

#include <time.h>

int main () {

  timestamp t1 = 315671400000000l;
  struct tm tt, *tm = &tt;
  fsec_t fsec;

  timestamp2tm( &t1, NULL, tm, &fsec, NULL );
  //printf( "%d", tm->tm_year );

}