- update for test7-win32dll
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Bryce Denney
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@ -1,48 +1,55 @@
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test6-execsymbols2
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test7-win32dll
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Try again to allow the module to reference symbols in the executable.
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But this time, eliminate direct symbol references from the executable
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to the module, so that the executable can be linked first. I believe
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this will work ok for win32 and it's closer to how plugins need to work.
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What I think I learned from test5:
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> DLLs don't allow any symbols to be undefined at link time. So you have to
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> choose the order of how to build things so that each link is complete.
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> For a DLL that's used as a shared library, it must be built and linked on
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> its own (without the program), with symbols exported. This link must be
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> complete, so it can't depend on pieces from the program. Then, the
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> program can be linked with the DLL, with the program reading symbols from
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> the DLL. It can't go both ways.
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>
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> For a plugin environment, we want the plugin to be able to call functions
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> in the main code, without putting every single thing as a function pointer.
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> So the main executable should be built first, with appropriate symbols
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> exported, and then the plugin can import those symbols. The main
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> executable will find symbols in the DLL using lt_dlopen() and lt_dlsym(),
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> which probably maps to LoadLibrary() and GetProcAddress().
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This is similar to test6, but Psyon helped me port the main.cc code to
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use LoadLibrary/GetProcAddress and make a Makefile that actually works.
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module1.lo: In function `module_init(void)':
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/home/bryce/bochs-testing/plugin-test/test6-execsymbols2/module1.cc:7: undefined reference to `import stub for register_module(char const *)'
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---------------------
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ltdl error
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Program received signal SIGSEGV, Segmentation fault.
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tryall_dlopen_module (handle=0x78f928, prefix=0x0, dirname=0x0,
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dlname=0x100d2118 "cygmodule1-0.dll") at ltdl.c:1958
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1958 if (dirname[dirname_len -1] == '/')
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Current language: auto; currently c
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(gdb) where
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#0 tryall_dlopen_module (handle=0x78f928, prefix=0x0, dirname=0x0,
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dlname=0x100d2118 "cygmodule1-0.dll") at ltdl.c:1958
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#1 0x1000249b in find_module (handle=0x78f928, dir=0x0, libdir=0x100d2190
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"/home/bryce/bochs-testing/plugin-test/test6-ltdlopen/lib",
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dlname=0x100d2118 "cygmodule1-0.dll", old_name=0x100d2130 "libmodule1.a",
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installed=0) at ltdl.c:2024
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#2 0x100035f8 in try_dlopen (phandle=0x78f958,
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filename=0x78f98c "libmodule1.la") at ltdl.c:2798
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#3 0x100038a5 in lt_dlopen (filename=0x78f98c "libmodule1.la") at ltdl.c:2893
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#4 0x10001143 in load_module (fmt=0x100011fc "lib%s.la",
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name=0x100011f4 "module1") at main.cc:19
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#5 0x100012bb in main (argc=1, argv=0x100d0e60) at main.cc:46
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I found that even for a trivial example I cannot make a working executable
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with main in a DLL. Try making libmain a static library. But then would
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every module link in all the code, or still use an implementation lib?
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Standard build:
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/bin/sh.exe ../libtool g++ -mno-cygwin -g -c main.cc
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/bin/sh.exe ../libtool g++ -mno-cygwin -no-undefined -g -o libmain.la main.lo -rpath `pwd`/lib
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmain.la `pwd`/lib
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/bin/sh.exe ../libtool g++ -mno-cygwin -no-undefined -g -o uselib libmain.la
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/bin/sh.exe ../libtool g++ -mno-cygwin -g -c module1.cc
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/bin/sh.exe ../libtool g++ -mno-cygwin -no-undefined -g -o libmodule1.la module1.lo -rpath `pwd`/lib libmain.la
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmodule1.la `pwd`/lib
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/bin/sh.exe ../libtool g++ -mno-cygwin -g -c module2.cc
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/bin/sh.exe ../libtool g++ -mno-cygwin -no-undefined -g -o libmodule2.la module2.lo -rpath `pwd`/lib libmain.la
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmodule2.la `pwd`/lib
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Try with libmain as a static lib.
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -g -c main.cc
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -no-undefined -g -o libmain.la main.lo
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmain.la `pwd`/lib
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -no-undefined -g -o uselib libmain.la
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -g -c module1.cc
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -no-undefined -g -o libmodule1.la module1.lo -rpath `pwd`/lib libmain.la
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmodule1.la `pwd`/lib
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -g -c module2.cc
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/bin/sh.exe ../libtool g++ -ggdb -mno-cygwin -no-undefined -g -o libmodule2.la module2.lo -rpath `pwd`/lib libmain.la
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mkdir -p lib bin
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/bin/sh.exe ../libtool cp libmodule2.la `pwd`/lib
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How to make an import library for cygmodule2-0.dll
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dlltool --as=as --dllname cygmodule2-0.dll --def .libs/cygmodule2-0.dll-def --output-lib .libs/libimp-cygmodule2-0.a
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dll-def file is:
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EXPORTS
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module_init @ 1 ;
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n_operations @ 2 DATA ;
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operate__Fii @ 3 ;
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