egcs and ios::failure

egcs and ios::failure

[Peter Garner]

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Good Day all!

  I recently downloaded egcs-19980425 since I would like an
ISO C++ compiler.  To get the right file errors, I patched
streambuf.h and streambuf.cc so that it would throw an
ios::failure exception (that class being a child of
exception per the ISO draft.)  When I attempt to use this I
get a segmentation fault.  I thought you might like to see
this.  I have attached a file "test.tar" that contains the
difference between the original and patched h file
(hdiff.txt) and the difference between the original and
patched cc file (ccdiff.txt) and fexcptst.cpp, a simple
program that tests / causes the segmentation fault.

  Lastly, please pardon me, but I noticed that the original
threw an exception by pointer.  In general isn't that a
very bad idea?  I was always taught to write a copy
constructor for all exceptions and always throw by value,
never by new.  Doesn't a construct like :

throw new failure ( this ) 

lead to a memory leak since it becomes the responsibility
of the catch block to delete the pointer?

Thanks

Peter



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Re: egcs and ios::failure

[Gerald Pfeifer]

On Thu, 2 May 1996, Peter  Garner wrote:
>   I recently downloaded egcs-19980425 since I would like an
> ISO C++ compiler. [...]

Which platform are you using (output of `gcc -v` for example)?

Gerald


PS: Aehm, I've now received three identical message from you to the list
    within a couple of minutes...
-- 
Gerald Pfeifer (Jerry)      Vienna University of Technology
pfeifer@dbai.tuwien.ac.at   http://www.dbai.tuwien.ac.at/~pfeifer/

Re: egcs and ios::failure

[Gerald Pfeifer]

On Sat, 2 May 1998, Peter  Garner wrote:
> Is it possible that I am accidently linking with a library that came
> with the RedHat distribution instead of the egcs library?\x03I noticed I
> have 3 distinct libiberty.a on my machine! 

Have you tried actually running gcc/g++ (from egcs) with option -v?

If you do that, you'll get a bunch of information, among others the
library paths used...

Gerald
-- 
Gerald Pfeifer (Jerry)      Vienna University of Technology
pfeifer@dbai.tuwien.ac.at   http://www.dbai.tuwien.ac.at/~pfeifer/

Re: egcs and ios::failure

[Jean-Pierre Radley]

Peter  Garner telecommunicated (on 02May):
| 
| >PS: Aehm, I've now received three identical message from
| >you to the list within a couple of minutes... 
| 
| Yes, I am very sorry about that.  I hate to do something so
| foolish with my first post in this list!  The first two
| times I sent that message, my pop mail server reported that
| the delivery was unsuccessful, and that the network
| connection had been lost.  I was terribly embarrassed when
| I saw all 3 copies had been recieved!

And all three of them had a date of 2May1996, and did not have a Subject
line either.

-- 
Jean-Pierre Radley <jpr@jpr.com>  XC/XT Custodian   Sysop, CompuServe SCOForum

Re: egcs and ios::failure

[Peter Garner]

>Which platform are you using (output of `gcc -v` for
>example)? 

I am running on Redhat Linux V5.0 with a Pentium II,  The
output of gcc -v is :

gcc version egcs-2.91.25 19980425 (gcc2 ss-980401 experimental)

In addition, snooping around with gdb I have found the error
(fault) occurs at line 60 of memcpy.c.  However, there is
no line 60 in the memcpy.c that comes with that snapshot.
Is it possible that I am accidently linking with a library
that came with the RedHat distribution instead of the egcs
library?\x03I noticed I have 3 distinct libiberty.a on my
machine!


>PS: Aehm, I've now received three identical message from
>you to the list within a couple of minutes... 

Yes, I am very sorry about that.  I hate to do something so
foolish with my first post in this list!  The first two
times I sent that message, my pop mail server reported that
the delivery was unsuccessful, and that the network
connection had been lost.  I was terribly embarrassed when
I saw all 3 copies had been recieved!


Thanks

Peter