On Thu, Dec 23, 2010 at 7:09 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote:
> Lucky Lu <Lucky.Lu@xxxxxxxxxxxxxxxxxx> writes:
>
>> I am having trouble with building the gcc 4.5.1 with --enable-plugin on Cygwin.
>
> As far as I know gcc plugins don't work on cygwin.
>
>> The configure string is "--enable-plugin --enable-languages=c,c++ --disable-bootstrap".
>> The error is ,
>> checking for -rdynamic... objdump: conftest: not a dynamic object no
>> checking for library containing dlopen... none required
>> checking for -fPIC -shared... no
>> configure: error:
>> Building GCC with plugin support requires a host that supports
>> -fPIC, -shared, -ldl and -rdynamic.
>> make[1]: *** [configure-gcc] Error 1
>>
>> When I jump the -fPIC checking, it's success. And then failed when building a gcc plugin, print following,
>>
>> plugin.c:1:0: warning: -fPIC ignored for target (all code is position independent)
>> /tmp/ccU93aXF.o:plugin.c:(.text+0xd1): undefined reference to `_build3_stat'
>> /tmp/ccU93aXF.o:plugin.c:(.text+0xff): undefined reference to `_gimple_assign_single_p'
>> .....
>
> That's in essence because -rdynamic doesn't do anything on Windows. It
> goes further, in that I don't know that there is any way it can be made
> to work given the way that Windows DLLs work. There may be some way to
> make it work; I just don't know of one.
In Windows, EXEs can export symbols like DLLs. I've never used the
feature, though.
__declspec(dllexport) int g_global = 0;
int main(int argc, char* argv[])
{
return 0;
}
>dumpbin -exports exporttest.exe
Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file exporttest.exe
File Type: EXECUTABLE IMAGE
Section contains the following exports for exporttest.exe
00000000 characteristics
4D13EC00 time date stamp Thu Dec 23 19:40:32 2010
0.00 version
1 ordinal base
1 number of functions
1 number of names
ordinal hint RVA name
1 0 00017140 ?g_global@@3HA = ?g_global@@3HA (int g_global)
Summary
1000 .data
1000 .idata
2000 .rdata
1000 .reloc
1000 .rsrc
4000 .text
10000 .textbss
>
Jeff
