From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcel Ruff <ruff@swand.lake.de>
To: gcc <gcc@gcc.gnu.org>
Subject: Static initializer in shared libraries on Linux #2
Date: Sun, 16 Sep 2001 06:18:00 -0000
Message-id: <3BA4A6A2.5040003@swand.lake.de>
X-SW-Source: 2001-09/msg00624.html

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