[ python-Bugs-1465838 ] HP-UX11i: illegal combination of compilation and link flags

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Bugs item #1465838, was opened at 2006-04-06 09:53
Message generated for change (Comment added) made by rwgk
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Category: Installation
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Ralf W. Grosse-Kunstleve (rwgk)
Assigned to: Nobody/Anonymous (nobody)
Summary: HP-UX11i: illegal combination of compilation and link flags

Initial Comment:
According to Boris Gubenko from the HP-UX compiler
development team, it is illegal to link with -lpthread
if the sources are not compiled with -mt. However, this
is exactly what happens during Python installation, e.g.:

        cc -Ae -c  -DNDEBUG -O  -I. -I./Include  
-DPy_BUILD_CORE -o Python/compile.o Python/compile.c
...
         aCC  -Wl,-E -Wl,+s -o python \
                        Modules/python.o \
                        libpython2.5.a -lnsl -lrt -ldld
-ldl  -lpthread   -lm  

This illegal combination of compilation and link flags
eventually results in obscure runtime failures
(segfault, abort) while running Boost.Python C++
extensions. These failures go away if Python is
installed with, e.g.:

env CXX="aCC -mt" BASECFLAGS="-mt" ./configure
--without-gcc

I suggest changing the configure/make files to always
include "-mt" if threading is enabled.

BTW: The same issue already exists for Python 2.4.

Cheers,
        Ralf


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>Comment By: Ralf W. Grosse-Kunstleve (rwgk)
Date: 2006-04-10 12:44

Message:
Logged In: YES 
user_id=71407

> Hm. We need to detect if we're on HP/UX, of course. Is
> this option for all versions?

I guess so since it seems very fundamental, but I am not
sure. I alerted Boris Gubenko to this problem report. I hope
he will help out.

> And I assume it's only for the HP compiler, not gcc?

I don't know. I imagine gcc has similar issues since it does
link with the same -lpthread eventually.

Note that the machine I used is publically accessible:

http://www.testdrive.hp.com/

After you register on the web:

telnet td176.testdrive.hp.com

gcc 3.4.3 is installed.


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Comment By: Anthony Baxter (anthonybaxter)
Date: 2006-04-09 08:30

Message:
Logged In: YES 
user_id=29957

Hm. We need to detect if we're on HP/UX, of course. Is this
option for all versions? And I assume it's only for the HP
compiler, not gcc?


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