problem create shared dll and -shared option

[Craig A. Vanderborgh]

Hello,

We got dll's using GCC compiled with arm-wince-pe working last year. 
The main trick is that the "-shared" option does not work correctly for
the arm-wince-pe target.  With the help of Kai Ruotto (on crossgcc) we
arrived at the conclusion that a special 5 step linking process is
required to create dll's with the relocations done properly on
arm-wince-pe.

I have attached an example (with an all-important "project.mk") that
shows you how to do the link so that the result will run on wince.
This example creates a "Hello World" type of thing that can function as
a JNI component for java.  We hope this helps you.

Also, a fully operational toolchain for arm-wince-pe
(gcc-3.2/binutils2.13) is available "ready-to-run" for x86linux (RedHat
7.1+).  Just make sure you have "-march" set for your platform.  You can
get the toolchain from this url:

http://www.atomiser.org/open_source_wince/wincegcc031303.tar.bz2

This toolchain will build an operational dll from the sources I've
attached.

regards,
craig vanderborgh
voxware incorporated

On Wed, 2003-03-26 at 01:14, longchuan wrote:
> hello all:
> 
> I had built a cross compiler host=mingw32, target=arm-pe and now i have
> a problem of create shared
> dll.(binutils-2.13-20020903-1-src.tar.gz,gcc-3.2-20020817-1.src.tar.gz
> from mingw)
> 
> 1.
> test.def
> ------------------------
> LIBRARY test.dll
> EXPORTS
> 	_TestFunc
> ----------------------------
> building
> dlltool -d test.def -e test.exp -C -D test.dll -l test.lib -f
> -mcpu=arm7dmi -f -march=armv4
> 2.
> test.c
> ------------------------
> int _DllMainCRTStartup(int pPcb, int op, void* arg3) {return 1;}
> 
> void TestFunc() {return;}
> ------------------------
> building
> gcc -O0 -c -fno-exceptions -fno-rtti -fms-extensions -w
> -falign-functions=4 -mcpu=arm7dmi -march=armv4  test.c
> 
> 3.	using ld to create dll
> ld   --dll --subsystem console  --entry __DllMainCRTStartup   -Map
> test.map --image-base 0x10000000 -o test.dll  test.exp test.o
> 
> But this dll doesn't have relocation table
> 
> objdump -x test.dll
> test.dll:     file format pei-arm-little
> test.dll
> architecture: armv4, flags 0x00000132:
> EXEC_P, HAS_SYMS, HAS_LOCALS, D_PAGED
> start address 0x10001000
> 
> Characteristics 0x6607
>         relocations stripped		// no relocations information
>         executable
>         line numbers stripped
>         debugging information removed
>         DLL
> [snip]
> 
> I could do the same job with mingw32 gcc for win32, just two
> differences:
> a) at step 1,omit the leading underscore for TestFunc in def file;
> b) at step 3, add -shared option for ld.exe
> and this dll has relocation information.
> Document said that -shared option of ld is" Create a shared library.
> This is currently only supported on ELF, XCOFF and SunOS platforms...."
> , i am not sure whether it support arm-pe configuration.
> when give -shared option to my arm-pe gcc, ld reports:
> Cannot export TestFunc: symbol not found
> Cannot export _DllMainCRTStartup: symbol not found
> 
> Any ideas about this situation?
> TIA
> wreckor
> 
> 
> ------
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