[Bug 1885827] Re: building plugin failed on Windows with mingw

[Thomas Huth <1885827@bugs.launchpad.net>]

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** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1885827

Title:
  building plugin failed on Windows with mingw

Status in QEMU:
  Incomplete

Bug description:
  I want to build QEMU 4.2.0's plugin module on Windows 7/10 with Mingw, but the building process faild.
   
  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. switch dir to /dsp_build, make -C tests/plugin, yeilds error: 
     CC      bb.o
   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
     17 | QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
        |                        ^~~~~~~~~~~~~~~~~~~
   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]
   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c: In function 'vcpu_tb_exec':
   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:33:29: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     33 |     unsigned long n_insns = (unsigned long)udata;
        |                             ^
   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c: In function 'vcpu_tb_trans':
   D:/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/tests/plugin/bb.c:51:46: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     51 |                                              (void *)n_insns);

  5.  Then , I modified the QEMU_flags and the compilation command
  arguments($(CC) ..) in  the  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  		#added  -DBUILDING_DLL
  		QEMU_CFLAGS += -I$(SRC_PATH)/include/qemu

                  all: $(SONAMES)

  		lib%.so: %.o
  			$(CC) -fPIC -shared -o $@ $^ $(LDLIBS) -L /c/msys64/mingw64/lib/ -lglib-2.0
  			# original cmd: $(CC) -shared -Wl,-soname,$@ -o $@ $^ $(LDLIBS)

  		clean:
  			rm -f *.o *.so *.d
  			rm -Rf .libs

                  .PHONY: all clean

  6.  Executing make yeilds:

  make: enter   “/d/emu_devl/qemu_src/qemu-sr-dsp-a/qemu_tidsp_c3x/build_dsp/tests/plugin”
    CC      bb.o
  x86_64-w64-mingw32-gcc -fPIC -shared -o libbb.so bb.o  -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'
  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:64: undefined reference to `qemu_plugin_register_atexit_cb'
  C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: bb.o:bb.c:(.rdata$.refptr.__stack_chk_guard[.refptr.__stack_chk_guard]+0x0): undefined reference to `__stack_chk_guard'
  collect2.exe: error: ld returned 1 exit status

     It looks like linking problem(fail to link functions defined in api.c, core.c...), but I have no idea what goes wrong. If I mannualy add api.o, core.o in the compilation command, still get error like undefined reference to '__stack_chk_guard'. 
     My collegue can build 4.2.0  plugins on Ubuntu Linux without any problem.

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