plugin-test
Bryce Denney
This is a series of simple programs that test your platform for shared
library support. The tests start from something trivial that should
work everywhere, and gradually add one feature at a time, until at
the end (not done yet) it should test all of the shared library
features that Bochs needs to support plugins.
test1-static: build a static library and link against it
test2-dynamic: with same code, build a shared library and link against it
test3-twomodules: build 2 shared libs and link against them
test4-interdep: build 2 shared libs, one depends on the other, and link
test5-execsymbols: can a shared lib can access a symbol from the executable?
test6-ltdlopen: use ltdl library to dlopen modules, should work on many
platforms, but doesn't seem to work on win32.
test7-win32dll: same as test6-ltdlopen but specific to win32 DLLs
Notes for win32 DLLs:
*.dll.a is an import library
libtool makes an import library when you link against a DLL
dlltool --as=as --dllname cygmodule2-0.dll --def .libs/cygmodule2-0.dll-def --output-lib .libs/libimp-cygmodule2-0.a
the dll-def file is created at the time that the DLL is created.
Exporting a class from a DLL...
http://www.codeguru.com/win32/dyndllclass.shtml
Win32 DLL Topics
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_core_dll_topics.asp
------
Mutual DLL imports
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_core_mutual_imports.asp
Exporting or importing to another executable file presents complications when
the imports are mutual (or "circular"). For example, two DLLs import symbols
from each other, similar to mutually-recursive functions.
The problem with mutually-importing executable files (usually DLLs) is that
neither can be built without building the other first. Each build process
requires, as input, an import library produced by the other build process.
The solution is to use the LIB utility with the /DEF option, which produces an
import library without building the executable file. Using this utility, you
can build all the import libraries you need, no matter how many DLLs are
involved or how complicated the dependencies are.
The general solution for handling mutual imports is:
1.Take each DLL in turn. (Any order is feasible, although some orders are more
optimal.) If all the needed import libraries exist and are current, run LINK to
build the executable file (DLL). This produces an import library. Otherwise,
run LIB to produce an import library.
Running LIB with the /DEF option produces an additional file with an .EXP
extension. The .EXP file must be used later to build the executable file.
2.After using either LINK or LIB to build all the import libraries, go back and
run LINK to build any executable files that were not built in the previous
step. Note that the corresponding .EXP file must be specified on the LINK line.
If you had run the LIB utility earlier to produce an import library for DLL1,
LIB would have produced the file DLL1.EXP as well. You must use DLL1.EXP as
input to LINK when building DLL1.DLL.
-----------
this makes a symbol table for a file
dlltool.exe --export-all --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --output-def def.txt uselib.exe
These lines from test4 show that libtool does know how to make
import libraries:
> generating import library for `cygmodule1-0.dll'
> dlltool --as=as --dllname cygmodule1-0.dll --def .libs/cygmodule1-0.dll-def --output-lib .libs/libimp-cygmodule1-0.a
Now what I want to see is generation of an import library corresponding to
a BINARY.
/bin/sh.exe ../libtool g++ -g -O2 -c module1.cc
mkdir .libs
g++ -g -O2 -c module1.cc -DDLL_EXPORT -DPIC -o .libs/module1.lo
In file included from module1.cc:2:
module1.h:4: warning: #warning I will export DLL symbols for MODULE1
In file included from module1.cc:3:
module2.h:8: warning: #warning I will import DLL symbols for MODULE2
g++ -g -O2 -c module1.cc -o module1.o >/dev/null 2>&1
mv -f .libs/module1.lo module1.lo
/bin/sh.exe ../libtool g++ -g -O2 -c module2.cc
rm -f .libs/module2.lo
g++ -g -O2 -c module2.cc -DDLL_EXPORT -DPIC -o .libs/module2.lo
In file included from module2.cc:3:
module2.h:4: warning: #warning I will export DLL symbols for MODULE2
g++ -g -O2 -c module2.cc -o module2.o >/dev/null 2>&1
mv -f .libs/module2.lo module2.lo
/bin/sh.exe ../libtool g++ -no-undefined -o libmodule2.la module2.lo -rpath `pwd`/lib
rm -fr .libs/libmodule2.la .libs/libmodule2.* .libs/libmodule2.*
generating symbol list for `libmodule2.la'
dlltool --export-all --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --output-def .libs/cygmodule2-0.dll-def module2.lo
sed -e "1,/EXPORTS/d" -e "s/ @ [0-9]*//" -e "s/ *;.*$//" < .libs/cygmodule2-0.dll-def > .libs/libmodule2.exp
if test "x`head -1 .libs/libmodule2.exp`" = xEXPORTS; then cp .libs/libmodule2.exp .libs/cygmodule2-0.dll-def; else echo EXPORTS > .libs/cygmodule2-0.dll-def; _lt_hint=1; cat .libs/libmodule2.exp | while read symbol; do set dummy $symbol; case $# in 2) echo " $2 @ $_lt_hint ; " >> .libs/cygmodule2-0.dll-def;; *) echo " $2 @ $_lt_hint $3 ; " >> .libs/cygmodule2-0.dll-def;; esac; _lt_hint=`expr 1 + $_lt_hint`; done; fi
gcc -Wl,--base-file,.libs/cygmodule2-0.dll-base -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule2-0.dll module2.lo
dlltool --as=as --dllname cygmodule2-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule2-0.dll-def --base-file .libs/cygmodule2-0.dll-base --output-exp .libs/cygmodule2-0.dll-exp
gcc -Wl,--base-file,.libs/cygmodule2-0.dll-base .libs/cygmodule2-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule2-0.dll module2.lo
dlltool --as=as --dllname cygmodule2-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule2-0.dll-def --base-file .libs/cygmodule2-0.dll-base --output-exp .libs/cygmodule2-0.dll-exp --output-lib .libs/libmodule2.dll.a
gcc .libs/cygmodule2-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule2-0.dll module2.lo
ar cru .libs/libmodule2.a module2.o
ranlib .libs/libmodule2.a
creating libmodule2.la
(cd .libs && rm -f libmodule2.la && ln -s ../libmodule2.la libmodule2.la)
mkdir -p lib bin
/bin/sh.exe ../libtool cp libmodule2.la `pwd`/lib
cp .libs/libmodule2.dll.a /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule2.dll.a
dlpath=`bash 2>&1 -c '. .libs/libmodule2.lai;echo $dlname'`
dldir=/home/bryce/bochs-testing/plugin-test/test4-interdep/lib/`dirname $dlpath`
test -d $dldir || mkdir -p $dldir
cp .libs/cygmodule2-0.dll $dldir/cygmodule2-0.dll
cp .libs/libmodule2.lai /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule2.la
cp .libs/libmodule2.a /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule2.a
ranlib /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule2.a
chmod 644 /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule2.a
----------------------------------------------------------------------
Libraries have been installed in:
/home/bryce/bochs-testing/plugin-test/test4-interdep/lib
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
/bin/sh.exe ../libtool g++ -no-undefined -o libmodule1.la module1.lo -rpath `pwd`/lib libmodule2.la
generating import library for `cygmodule2-0.dll'
dlltool --as=as --dllname cygmodule2-0.dll --def .libs/cygmodule2-0.dll-def --output-lib .libs/libimp-cygmodule2-0.a
rm -fr .libs/libmodule1.la .libs/libmodule1.* .libs/libmodule1.*
generating symbol list for `libmodule1.la'
dlltool --export-all --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --output-def .libs/cygmodule1-0.dll-def module1.lo
sed -e "1,/EXPORTS/d" -e "s/ @ [0-9]*//" -e "s/ *;.*$//" < .libs/cygmodule1-0.dll-def > .libs/libmodule1.exp
if test "x`head -1 .libs/libmodule1.exp`" = xEXPORTS; then cp .libs/libmodule1.exp .libs/cygmodule1-0.dll-def; else echo EXPORTS > .libs/cygmodule1-0.dll-def; _lt_hint=1; cat .libs/libmodule1.exp | while read symbol; do set dummy $symbol; case $# in 2) echo " $2 @ $_lt_hint ; " >> .libs/cygmodule1-0.dll-def;; *) echo " $2 @ $_lt_hint $3 ; " >> .libs/cygmodule1-0.dll-def;; esac; _lt_hint=`expr 1 + $_lt_hint`; done; fi
gcc -Wl,--base-file,.libs/cygmodule1-0.dll-base -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo .libs/libimp-cygmodule2-0.a
dlltool --as=as --dllname cygmodule1-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule1-0.dll-def --base-file .libs/cygmodule1-0.dll-base --output-exp .libs/cygmodule1-0.dll-exp
gcc -Wl,--base-file,.libs/cygmodule1-0.dll-base .libs/cygmodule1-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo .libs/libimp-cygmodule2-0.a
dlltool --as=as --dllname cygmodule1-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule1-0.dll-def --base-file .libs/cygmodule1-0.dll-base --output-exp .libs/cygmodule1-0.dll-exp --output-lib .libs/libmodule1.dll.a
gcc .libs/cygmodule1-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo .libs/libimp-cygmodule2-0.a
ar cru .libs/libmodule1.a module1.o
ranlib .libs/libmodule1.a
creating libmodule1.la
(cd .libs && rm -f libmodule1.la && ln -s ../libmodule1.la libmodule1.la)
mkdir -p lib bin
/bin/sh.exe ../libtool cp libmodule1.la `pwd`/lib
libtool: install: warning: relinking `libmodule1.la'
cd /home/bryce/bochs-testing/plugin-test/test4-interdep; /bin/sh ../libtool --mode=relink g++ -no-undefined -o libmodule1.la module1.lo -rpath /home/bryce/bochs-testing/plugin-test/test4-interdep/lib libmodule2.la
generating symbol list for `libmodule1.la'
dlltool --export-all --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --output-def .libs/cygmodule1-0.dll-def module1.lo
sed -e "1,/EXPORTS/d" -e "s/ @ [0-9]*//" -e "s/ *;.*$//" < .libs/cygmodule1-0.dll-def > .libs/libmodule1.exp
if test "x`head -1 .libs/libmodule1.exp`" = xEXPORTS; then cp .libs/libmodule1.exp .libs/cygmodule1-0.dll-def; else echo EXPORTS > .libs/cygmodule1-0.dll-def; _lt_hint=1; cat .libs/libmodule1.exp | while read symbol; do set dummy $symbol; case $# in 2) echo " $2 @ $_lt_hint ; " >> .libs/cygmodule1-0.dll-def;; *) echo " $2 @ $_lt_hint $3 ; " >> .libs/cygmodule1-0.dll-def;; esac; _lt_hint=`expr 1 + $_lt_hint`; done; fi
gcc -Wl,--base-file,.libs/cygmodule1-0.dll-base -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo -L/home/bryce/bochs-testing/plugin-test/test4-interdep/lib -lmodule2
dlltool --as=as --dllname cygmodule1-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule1-0.dll-def --base-file .libs/cygmodule1-0.dll-base --output-exp .libs/cygmodule1-0.dll-exp
gcc -Wl,--base-file,.libs/cygmodule1-0.dll-base .libs/cygmodule1-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo -L/home/bryce/bochs-testing/plugin-test/test4-interdep/lib -lmodule2
dlltool --as=as --dllname cygmodule1-0.dll --exclude-symbols DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12,DllMainCRTStartup@12,DllEntryPoint@12 --def .libs/cygmodule1-0.dll-def --base-file .libs/cygmodule1-0.dll-base --output-exp .libs/cygmodule1-0.dll-exp --output-lib .libs/libmodule1.dll.a
gcc .libs/cygmodule1-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12 -o .libs/cygmodule1-0.dll module1.lo -L/home/bryce/bochs-testing/plugin-test/test4-interdep/lib -lmodule2
cp .libs/libmodule1.dll.aT /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule1.dll.a
dlpath=`bash 2>&1 -c '. .libs/libmodule1.lai;echo $dlname'`
dldir=/home/bryce/bochs-testing/plugin-test/test4-interdep/lib/`dirname $dlpath`
test -d $dldir || mkdir -p $dldir
cp .libs/cygmodule1-0.dll $dldir/cygmodule1-0.dll
cp .libs/libmodule1.lai /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule1.la
cp .libs/libmodule1.a /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule1.a
ranlib /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule1.a
chmod 644 /home/bryce/bochs-testing/plugin-test/test4-interdep/lib/libmodule1.a
----------------------------------------------------------------------
Libraries have been installed in:
/home/bryce/bochs-testing/plugin-test/test4-interdep/lib
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
/bin/sh.exe ../libtool g++ -no-undefined -o uselib ./uselib.cc libmodule1.la libmodule2.la
generating import library for `cygmodule1-0.dll'
dlltool --as=as --dllname cygmodule1-0.dll --def .libs/cygmodule1-0.dll-def --output-lib .libs/libimp-cygmodule1-0.a
g++ -o .libs/uselib ./uselib.cc .libs/libimp-cygmodule1-0.a .libs/libimp-cygmodule2-0.a -Wl,--rpath -Wl,/home/bryce/bochs-testing/plugin-test/test4-interdep/lib
In file included from ./uselib.cc:2:
module1.h:8: warning: #warning I will import DLL symbols for MODULE1
In file included from ./uselib.cc:3:
module2.h:8: warning: #warning I will import DLL symbols for MODULE2
creating uselib.exe
Try making a dll with everything in it, and then a nearly empty object that
build libmain.la with main.lo
build module1.la with libmain.la
build module2.la with libmain.la
build .exe from libmain.la
Then main.cc can dlopen module1.la
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