You are right. Thanks.

I found macro BUILDING_DLL in the file src/Makefile.port. 
I move the DLL source code from the backend path. It can be successfully built.

The file Makefile.port contains 
        ifneq (,$(findstring backend,$(subdir)))
        ifeq (,$(findstring conversion_procs,$(subdir)))
        override CPPFLAGS+= -DBUILDING_DLL

----- Original Message ----- 
From: "Andrei Kovalevski" <[EMAIL PROTECTED]>
To: <>
Sent: Wednesday, May 30, 2007 1:35 AM
Subject: Re: [HACKERS] Help! DLL make faild under windows mingw.

> Hi!
> What exactly are you trying to build? If you have own-written Makefile
> for this - post it here. Does your code contain #define BUILDING_DLL
> before inclusion of PostgreSQL headers?
> Wang Haiyong wrote:
>> I am doing a DLL project, it is in the backend/utils/mb. But it can
>> not be maked under windows mingw.
>> I require everyone to help me. Thank your very much.
>> The error infomations are as follows.
>> Info: resolving _CurrentMemoryContext by linking to
>> __imp__CurrentMemoryContext (auto-import)
>> Info: resolving _SPI_processed by linking to __imp__SPI_processed
>> (auto-import)
>> Info: resolving _SPI_tuptable by linking to __imp__SPI_tuptable
>> (auto-import)
>> Info: resolving _default_statistics_target by linking to
>> __imp__default_statistics_target (auto-import)
>> fu000001.o(.idata$3+0xc): undefined reference to `libpostgres_a_iname'
>> fu000002.o(.idata$3+0xc): undefined reference to `libpostgres_a_iname'
>> fu000003.o(.idata$3+0xc): undefined reference to `libpostgres_a_iname'
>> fu000004.o(.idata$3+0xc): undefined reference to `libpostgres_a_iname'
>> fu000005.o(.idata$3+0xc): undefined reference to `libpostgres_a_iname'
>> fu000006.o(.idata$3+0xc): more undefined references to
>> `libpostgres_a_iname' follow
>> nmth000000.o(.idata$4+0x0): undefined reference to
>> `_nm__CurrentMemoryContext'
>> nmth000111.o(.idata$4+0x0): undefined reference to `_nm__SPI_processed'
>> nmth000118.o(.idata$4+0x0): undefined reference to `_nm__SPI_tuptable'
>> nmth000127.o(.idata$4+0x0): undefined reference to
>> `_nm__default_statistics_target'
>> d:\MinGW\bin\dllwrap.exe: d:\MinGW\bin\gcc exited with status 1
>> make: *** [libnsqlgeom.dll] Error 1
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