RE?? How to build QEMU plugin on Windows with mingw

[casmac]

Hi Alex,
   Thansk for looking on this . In the last message, the compilation command is 
a bit misleading. I am filling in more details.
    If I keep "-Wl,-soname,$@" in the command , I got similar linking errors.
  
makefile:  
SONAMES := $(addsuffix .dll,$(addprefix lib,$(NAMES)))

QEMU_CFLAGS += -fPIC -fno-stack-protector -DBUILDING_DLL
QEMU_CFLAGS += -I$(SRC_PATH)/include/qemu

all: $(SONAMES)
lib%.dll: %.o
    $(CC) -shared -Wl,-soname,$@ -o $@ $^ $(LDLIBS)

output:
x86_64-w64-mingw32-gcc -shared -Wl,-soname,libbb.dll -o libbb.dll bb.o
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `g_autoptr_cleanup_generic_gfree':
C:/msys64/mingw64/include/glib-2.0/glib/glib-autocleanups.h:28: undefined 
reference to `g_free'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `plugin_exit':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:27: undefined reference to 
`g_strdup_printf'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:29: undefined reference to 
`qemu_plugin_outs'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `vcpu_tb_trans':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:42: undefined reference to 
`qemu_plugin_tb_n_insns'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:45: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_inline'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:47: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_inline'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:50: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_cb'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `qemu_plugin_install':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:64: undefined reference to 
`qemu_plugin_register_vcpu_tb_trans_cb'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:65: undefined reference to 
`qemu_plugin_register_atexit_cb'
collect2.exe: error: ld returned 1 exit status

    On windows, I replace $LDLIBS with $LIBS here, because $LDLIBS seems 
undefined. But still yields linking error, except. 
     lib%.dll: %.o
       $(CC) -shared -Wl,-soname,$@ -o $@ $^ $(LIBS)"

x86_64-w64-mingw32-gcc -shared -Wl,-soname,libbb.dll -o libbb.dll bb.o -ldl 
-LC:/msys64/mingw64/lib -lz -LC:/msys64/mingw64/lib -lgmodule-2.0 -pthread 
-lglib-2.0 -lintl -LC:/msys64/mingw64/lib -lgthread-2.0 -pthread -lglib-2.0 
-lintl -lwinmm -lws2_32 -liphlpapi
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `plugin_exit':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:29: undefined reference to 
`qemu_plugin_outs'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `vcpu_tb_trans':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:42: undefined reference to 
`qemu_plugin_tb_n_insns'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:45: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_inline'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:47: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_inline'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:50: undefined reference to 
`qemu_plugin_register_vcpu_tb_exec_cb'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 bb.o: in function `qemu_plugin_install':
C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:64: undefined reference to 
`qemu_plugin_register_vcpu_tb_trans_cb'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
 C:/QRS_Project/simdsp/qemu-4.2.0/tests/plugin/bb.c:65: undefined reference to 
`qemu_plugin_register_atexit_cb'

    The libdl library (where dlopen() is defined) was not shipped with MSYS2 
mingw . It is compiled from source(https://github.com/dlfcn-win32/dlfcn-win32), 
and I place the generated libdl.dll, libdl.a, libdl.dll.a in 
C:\msys64\mingw64\include.  dlfcn.h in C:\msys64\mingw64\include.

regards,
xiaolei

-------------------------------------------
casmac <climber.cui@qq.com> writes:

> Hi all,
> &nbsp;&nbsp; I want to build QEMU 4.2.0 with the plugin module on
> Windows 7 with Mingw, but the building process faild.&nbsp;

I'm afraid I've never tried with mingw... that said:

The step I follow is listed below:
> 1. create "dsp_build" diretory under source file folder 
>
>
> 2.   change directory to dsp_build , and run ../configure  
> --target-list=dsp-softmmu --cross-prefix=x86_64-w64-mingw32-  --enable-gtk 
> --enable-sdl --enable-debug --enable-plugins
> 3. build qemu project 
> 4. running "make -C tests/plugin", yeilds error:&nbsp; 
> &nbsp; &nbsp;CC&nbsp; &nbsp; &nbsp; bb.o
> &nbsp;D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:17:24:
>   error: variable 'qemu_plugin_version' definition is marked dllimport
> &nbsp; &nbsp;17 | QEMU_PLUGIN_EXPORT int qemu_plugin_version = 
> QEMU_PLUGIN_VERSION;
> &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
> &nbsp; &nbsp; &nbsp; &nbsp; ^~~~~~~~~~~~~~~~~~~
> &nbsp;D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:17:24:
>   warning: 'qemu_plugin_version' redeclared without dllimport attribute:  
> previous dllimport ignored [-Wattributes]
>
>
> 5. &nbsp; I modified the QEMU_CFLAGS and the compilation command 
> arguments($(CC) ..) in&nbsp; the&nbsp; makefile :
>
>
>               BUILD_DIR := $(CURDIR)/../..
>
>
>               include $(BUILD_DIR)/config-host.mak
>               include $(SRC_PATH)/rules.mak
>
>
>               $(call set-vpath, $(SRC_PATH)/tests/plugin)
>
>
>               NAMES :=
>               NAMES += bb
>               NAMES += empty
>               NAMES += insn
>               NAMES += mem
>               NAMES += hotblocks
>               NAMES += howvec
>               NAMES += hotpages
>
>
>               SONAMES := $(addsuffix .so,$(addprefix lib,$(NAMES)))
>
>
>               QEMU_CFLAGS += -fPIC     -DBUILDING_DLL&nbsp;
>               #added&nbsp; -DBUILDING_DLL

Looking at the definition:

#if defined _WIN32 || defined __CYGWIN__
  #ifdef BUILDING_DLL
    #define QEMU_PLUGIN_EXPORT __declspec(dllexport)
  #else
    #define QEMU_PLUGIN_EXPORT __declspec(dllimport)
  #endif
  #define QEMU_PLUGIN_LOCAL
#else

I expect BUILDING_DLL is for ensuring QEMU itself exports the plugin
functions so the plugin can refer to them. So maybe try:

  ./configure --enable-plugins --extra-cflags="-DBUILDING_DLL"

and remove the -DBUILDING_DLL from the plugins themselves?


>               QEMU_CFLAGS += -I$(SRC_PATH)/include/qemu
>
>
>               all: $(SONAMES)
>
>
>               lib%.so: %.o
>                       $(CC) -fPIC -shared -o $@ $^ $(LIBS) 
>                       # original command : $(CC) -shared -Wl,-soname,$@ -o $@ 
> $^ $(LDLIBS)
>
>
> 6.&nbsp; Executing make yeilds:
>
>
> make: enter&nbsp; 
> &nbsp;??/d/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/build_dsp/tests/plugin??
> &nbsp; CC&nbsp; &nbsp; &nbsp; bb.o
> x86_64-w64-mingw32-gcc -fPIC -shared -o libbb.so bb.o&nbsp; -L 
> /c/msys64/mingw64/lib/ -lglib-2.0
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   bb.o: in function `plugin_exit':
> D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:28: 
> undefined reference to `qemu_plugin_outs'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:29:  
> undefined reference to `__stack_chk_fail'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   bb.o: in function `vcpu_tb_trans':
> D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:41: 
> undefined reference to `qemu_plugin_tb_n_insns'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:44:  
> undefined reference to `qemu_plugin_register_vcpu_tb_exec_inline'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:46:  
> undefined reference to `qemu_plugin_register_vcpu_tb_exec_inline'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:49:  
> undefined reference to `qemu_plugin_register_vcpu_tb_exec_cb'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>   bb.o: in function `qemu_plugin_install':
> D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:63:  
> undefined reference to `qemu_plugin_register_vcpu_tb_trans_cb'
> collect2.exe: error: ld returned 1 exit status

-- 
Alex Benn??e