gnats/129: pthread-related link problem

[jle]

>Number:         129
>Category:       gnats
>Synopsis:       pthread-related link problem
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 17 03:24:02 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Jacque Leroy address@hidden
>Release:        gcc-2.95.2
>Organization:
>Environment:
hppa2.0-hp-hpux10.20
>Description:
 Depending on the existence of the file :
 
 /usr/include/pthread.h

 libstdc++.sl and libgcc.a may contain several undefined externals or not:

 pthread_once()
 pthread_setspecific()
 pthread_getspecific()
 pthread_createkey()

 So it may be necessary to add -lcma or -ldce to the link line to prevent 
undefined externals

 As a result, old executables (hppa1.1-hp-hpux9.XX) may start or not (undefined 
symbol error)

 We are in 
>How-To-Repeat:
Assumed you have a hppa2.0-hp-hpux10.20 at your fingertips

1) check you have pthread.h
2) rename pthread.h into something different

3) build your gcc-2.95.2 and install it
4) build any C++ application using iostream
(a simple cout << "Hello World !"; is enough)
 but do not link with -ldce or -lcma
5) check your app is running

6) bring back pthread.h
7) reconfigure, rebuild and reinstall your compiler gcc-2.95.2

8) the previoulsly running app won't start, saying that there are undefined 
symbols ...
>Fix:
 HELP !
>Release-Note:
>Audit-Trail:
>Unformatted: