"undefined reference" error when compiling extension functions
От | Mark Miller |
---|---|
Тема | "undefined reference" error when compiling extension functions |
Дата | |
Msg-id | 20050425203935.86E1B54A46@svr1.postgresql.org обсуждение исходный текст |
Ответы |
Re: "undefined reference" error when compiling
(Andrew Dunstan <andrew@dunslane.net>)
|
Список | pgsql-hackers-win32 |
I am trying to figure out how to write extension functions and I am getting “undefined reference” errors when I compile on the lines which call “malloc” and “pfree”. How can I get the compiler to see the functions so I can compile successfully?
I installed PostgreSQL on XP Pro using the windows installer, then I installed the includes (which are not part of the windows install) by running the following commands:
configure --without-zlib --includedir=/c/progra~1/postgresql/8.0/include --with-includes=/c/progra~1/postgresql/8.0/include/port/win32/*
make -C src/include install
Here’s the output from make when I try to compile:
$ make makefile filesize.dll
make: Nothing to be done for `makefile'.
gcc -g -I c:/Progra~1/PostgreSQL/8.0/include -I c:/Progra~1/PostgreSQL/8.0/include/server -I c:/Progra~1/PostgreSQL/8.0/include/server/port/win32 -I c:/Progra~1/PostgreSQL/8.0/lib -fpic -c filesize.c
cc1.exe: warning: -fpic ignored for target (all code is position independent)
gcc -g -I c:/Progra~1/PostgreSQL/8.0/include -I c:/Progra~1/PostgreSQL/8.0/include/server -I c:/Progra~1/PostgreSQL/8.0/include/server/port/win32 -I c:/Progra~1/PostgreSQL/8.0/lib -shared -o filesize.dll filesize.o
filesize.o(.text+0x1a): In function `filesize':
C:/msys/1.0/home/mark/dev/filesize.c:9: undefined reference to `pg_detoast_datum'
filesize.o(.text+0x3d):C:/msys/1.0/home/mark/dev/filesize.c:11: undefined reference to `_imp__CurrentMemoryContext'
filesize.o(.text+0x44):C:/msys/1.0/home/mark/dev/filesize.c:11: undefined reference to `MemoryContextAlloc'
filesize.o(.text+0x9b):C:/msys/1.0/home/mark/dev/filesize.c:19: undefined reference to `pfree'
filesize.o(.text+0xb1):C:/msys/1.0/home/mark/dev/filesize.c:25: undefined reference to `pfree'
make: *** [filesize.dll] Error 1
Here’s the source I’m trying to compile (taken from PostgreSQL ch 6 by Douglas and Douglas):
#include "postgres.h"
#include "fmgr.h"
#include <sys/stat.h>
PG_FUNCTION_INFO_V1(filesize);
Datum filesize(PG_FUNCTION_ARGS)
{
text * fileNameText = PG_GETARG_TEXT_P(0);
size_t fileNameLen = VARSIZE( fileNameText ) - VARHDRSZ;
char * fileName = (char *)palloc( fileNameLen + 1 );
struct stat statBuf;
memcpy( fileName, VARDATA( fileNameText), fileNameLen );
fileName[fileNameLen] = '\0';
if( stat(fileName, &statBuf) == 0 && S_ISREG(statBuf.st_mode) )
{
pfree( fileName );
PG_RETURN_INT32((int32)statBuf.st_size);
}
else
{
pfree( fileName );
PG_RETURN_NULL();
}
}
Here’s the makefile, from the same example but modified to include the needed include directories and to output “.dll” file instead of “.so”.
# File name: makefile
SERVER_INCLUDES += -I $(shell pg_config --includedir)
SERVER_INCLUDES += -I $(shell pg_config --includedir-server)
SERVER_INCLUDES += -I $(shell pg_config --includedir-server)/port/win32
SERVER_INCLUDES += -I $(shell pg_config --libdir)
CFLAGS += -g $(SERVER_INCLUDES)
.SUFFIXES: .dll
.c.dll:
$(CC) $(CFLAGS) -fpic -c $<
$(CC) $(CFLAGS) -shared -o $@ $(basename $<).o
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