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Bryce Denney f49ec8c71c Fix serveral ltdl bugs related to searching for libraries, and what 
to do if they cannot be found.

- in try_dlopen, after find_handle() is called and returns 0 over
  and over, it was ignoring the return value of tryall_dlopen.  As
  a result, sometimes the dlopen would fail and return 1 or more
  errors but nobody would notice.  The handle would be returned as
  if the open had succeed, then any use of the handle would segfault
  because handle->loader was NULL.  I have solved this problem by
  capturing the return value in errors, and then checking if errors>0
  in the next if statement.
- fix faulty boolean logic in lt_dlopenext that caused it to only
  search for libraries ending with .la.  Now it says: if try_dlopen
  created a nonzero handle, return it.  Otherwise, if there were
  any errors OTHER THAN file-not-found, return the NULL handle.  If
  the only errors were file-not-found, continue to search.
- just before loading the module in tryall_dlopen, do one final
  call to access() to check for existence of the file.  Without
  this check, you sometimes get the "can't load module" error
  when in fact the problem is "file not found".
2002-10-16 02:08:02 +00:00
..
libltdl Fix serveral ltdl bugs related to searching for libraries, and what 2002-10-16 02:08:02 +00:00
test1-static - support VPATH build 2002-10-11 18:32:27 +00:00
test2-dynamic - support VPATH build 2002-10-11 18:32:27 +00:00
test3-twomodules - support VPATH build 2002-10-11 18:32:27 +00:00
test4-interdep - support VPATH build 2002-10-11 18:32:27 +00:00
test5-execsymbols - add some test results and comments 2002-10-12 05:52:55 +00:00
test6-ltdlopen - add reference to a variable, like in test7 2002-10-16 01:32:52 +00:00
test7-win32dll - add notes about what works and what doesn't 2002-10-16 01:37:42 +00:00
aclocal.m4 - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
config.guess - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
config.h.in - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
config.sub - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
configure - let each Makefile.in decide where and when to include INCLTDL and LIBLTDL 2002-10-16 01:37:11 +00:00
configure.in - let each Makefile.in decide where and when to include INCLTDL and LIBLTDL 2002-10-16 01:37:11 +00:00
install-sh - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
ltmain.sh - add configure support, since I'm starting to need different options 2002-10-11 18:15:27 +00:00
Makefile.in - do distclean in libltdl directory 2002-10-14 21:01:39 +00:00
README - mention test6,7 and add a good reference about win32 dlls 2002-10-14 21:08:14 +00:00

README 

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