shlibs/2063: Unable to step into shared library

[steve at telxio dot com]

>Number:         2063
>Category:       shlibs
>Synopsis:       Unable to step into shared library
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 06 01:18:01 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Steve Williams
>Release:        gdb-6.4
>Organization:
>Environment:
sparc-sun-solaris2.10
>Description:
GDB fails to step into a shared library function on Solaris10. Execution halts in _ti_bind_guard.

Attached is a patch that creates a Solaris2 specific shared library dynamic symbol resolver. I did not know if the solib-svr4.c file should be extended or whether a Solaris specific shared library file should be created.

I opted for a middle road, I created a Solaris specific file solib-sol2.c that uses a modified dynamic symbol resolver code detection mechanism. All other functions are reused from solib-svr4.c
>How-To-Repeat:
The test gdb.base/gdb1555.exp fails.

or

create a library
======== lib.c ==========
void fn(void)
{
  return;
}
====================
gcc -shared -o liblib.so -g lib.c

create an executable:

========= a.c ============
extern void fn(void);
int main(int argc, char *argv[])
{
  fn();
  return 0;
}
=======================
gcc -g t.c -L. -R. -llib

Run gdb with following commands:
gdb a.out
br main
run
step

step fails to step into function fn.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="gdb64-solib-step.patch"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="gdb64-solib-step.patch"
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