[Mingw-notify] [ mingw-Bugs-425021 ] Structured Exception Handling missing

[<no...@so...>]

Bugs item #425021, was updated on 2001-05-17 17:03
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=102435&aid=425021&group_id=2435

Category: gcc
Group: Known bugs
Status: Open
Resolution: None
Priority: 5
Submitted By: David Gravereaux (davygrvy)
Assigned to: Nobody/Anonymous (nobody)
Summary: Structured Exception Handling missing

Initial Comment:
Although Win32 SEH is an OS `feature`, it requires new 
language semantics:

http://msdn.microsoft.com/library/devprods/vs6/visualc/
vccore/_core_exception_handling_topics_.28.seh.29.htm

The attached file should compile with mingw.

The M$VC++ understands it:
D:\itcl_exp>cl -c SEHtest.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 
12.00.8804 for 80x86
Copyright (C) Microsoft Corp 1984-1998. All rights 
reserved.

sehtest.c

D:\itcl_exp>

MinGW does not:
daveg@HALEAKALA d:/itcl_exp
$ gcc -c -mno-cygwin SEHtest.c
SEHtest.c: In function `SomeCloseProc':
SEHtest.c:7: `__try' undeclared (first use in this 
function)
SEHtest.c:7: (Each undeclared identifier is reported 
only once
SEHtest.c:7: for each function it appears in.)
SEHtest.c:7: parse error before `{'
SEHtest.c: At top level:
SEHtest.c:11: syntax error before `{'
SEHtest.c:15: parse error before `1'
SEHtest.c:18: parse error before `return'

daveg@HALEAKALA d:/itcl_exp
$


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>Comment By: Danny Smith (dannysmith)
Date: 2001-05-17 17:43

Message:
Logged In: YES 
user_id=11494

Can you show me in the ANSI standard or any standard for 
that matter where SEH is defined as "built-in language 
statement"?  

I agree that SEH is useful and very important to some 
users, and I wish I knew enough about assembly programming 
to do something about it.  But...

BTW TCL 8.3.3 can be compiled with mingw, with a few simple 
patches to the __try blocks, which essentially convert them 
to no-ops. Crashes aren't handled very gracefully, but it 
will compile and run.  I have been intending to submit 
patches to TCL but have been delayed by the change in host 
of their site.

Danny

----------------------------------------------------------------------

Comment By: David Gravereaux (davygrvy)
Date: 2001-05-17 17:16

Message:
Logged In: YES 
user_id=7549

SEHtest.c:7: `__try' undeclared (first use in this function)

__try is not a function.  __try is a built-in language 
statement, and has semantics, to implement SEH.  __leave is 
only valid within a __try block.  GetExceptionCode() is not 
a function either.  It's a keyword only valid within the 
except filter.  I could keep going on defining the rules, 
but I'll save my typing energy for other things :)

Please don't consider this an M$ hack job.  SEH is very 
important to some users, like myself.  Tcl cannot be 
compiled by MinGW due to this missing feature.

----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=102435&aid=425021&group_id=2435