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Re: Static initializer in shared libraries on Linux #3
- To: "H . J . Lu" <hjl at lucon dot org>, gcc <gcc at gcc dot gnu dot org>
- Subject: Re: Static initializer in shared libraries on Linux #3
- From: Marcel Ruff <ruff at swand dot lake dot de>
- Date: Mon, 17 Sep 2001 18:52:17 +0200
- Reply-To: ruff at swand dot lake dot de
> H . J . Lu wrote:
> Please provide a small, complete testcase.
Here it is (this time attached):
testCpp.zip contains
./testCpp/InitTest.C
./testCpp/xy.C
./testCpp/compile.sh
./testCpp/CppCaller.java
(The zip is 1873 bytes, i hope it is OK
to send to your mailing list)
If you run the simple shell script on Linux
./compile.sh
it creates two shared libraries,
an executable xy.exe (which runs fine)
and compiles the java file (which fails on running).
thanks
Marcel
Marcel Ruff wrote:
> Hi,
>
> <more>
> I forgot to mention that if i compile
> xy.C to an executable, it runs fine,
> but if xy.C is compiled to a shared library,
> and invoked thru a java virtual machine ('no main()')
> it fails as noted below
> </more>
>
> i have two .so libs, and get a sig 11 when
> accessing a static string variable,
> accessing a static variable of type char*
> works fine:
>
>
> InitTest.H
> -----------
> class InitTest
> {
> public: static char * charName;
> public: static string stringName;
> };
> #if EXTERN_MAIN
> char * InitTest::charName = "Hello charP";
> string InitTest::stringName = string("Hello string");
> # endif
> -----------
>
> compile this into libInitTest.so
>
>
>
> xy.C
> ------------
> #define EXTERN_MAIN 1
> ....
> // Runs fine:
> cout << "C++: the charName=" << InitTest::charName << endl;
> // Sig 11 - core dump:
> cout << "C++: the stringName=" << InitTest::stringName << endl;
> ...
> ------------
>
> compile this into xy.so
> xy.C is run by a Java JVM using JNI.
>
>
> Looking into the .so libs:
> ---------------------
> nm -o *.so | grep charName
> libxy.so:00028910 D _8InitTest.charName
> libxy.so:0001bf60 t _GLOBAL_.D._8InitTest.charName
> libxy.so:0001bf30 t _GLOBAL_.I._8InitTest.charName
>
>
> nm -o *.so | grep stringName
> libxy.so:0002d4c8 B _8InitTest.stringName
> --------------------
>
> The "string" class is never initialized whereas
> the char* acts as expected!
> Why?
>
> Why is there no entry in libInitTest.so?
>
> What do i have to change to get this running?
>
> thanks for any help,
>
> Marcel
>
--
Marcel Ruff
mailto:ruff@swand.lake.de
http://www.lake.de/home/lake/swand/
http://www.xmlBlaster.org
testCpp.zip