Topic: C++ exception not working | The ELLCC Embedded Compiler Collection

This topic contains 8 replies, has 2 voices, and was last updated by rich 6 years ago.

Viewing 9 posts - 1 through 9 (of 9 total)

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January 20, 2016 at 2:27 pm #27958
uroni
Hi,

with ellcc 0.1.27. Test program:
```
#include <stdexcept>
#include <iostream>

int main()
{
        try
        {
                throw std::runtime_error("test");
        }
        catch(std::exception& e)
        {
                std::cout << "Caught exception: " << e.what() << std::endl;
                return 0;
        }
        return 1;
}
```
Exception is not caught. Could not see anything obivous missing.
ecc++ -v -Wl,–verbose shows that it sets -fexceptions, -fcxx-exceptions and it is linked with libunwind.

Thanks!
January 20, 2016 at 2:43 pm #27983

rich
Keymaster

Hi uroni,
What processor are you building for?
-Rich

January 20, 2016 at 5:52 pm #28247

uroni

Sorry,

didn’t work with the targets armv6-linux-engeabihf, x86_64-linux-eng and i386-linux-eng.

LLVM doesn’t seem to use exceptions and nghttp2 only sparingly, so you might not have noticed.

March 15, 2016 at 3:18 am #76516

Alexej Harm

Hello,

is this problem being worked on? C++ without exceptions is quite useless in a lot of scenarios.

Is there a bugzilla or some other bug/issue management for ELLCC?

If the problem won’t be addressed during the next 1-2 months, I could take a look at it and possibly help.

Best regards,
Alexej Harm

April 29, 2016 at 6:05 pm #76775

Alexej Harm

This problem still persists in ELLCC 0.1.30.

October 18, 2016 at 6:11 am #77591

Alexej Harm

This problem still persists in ELLCC 0.1.33.

October 23, 2016 at 2:23 pm #77601

uroni

@Alexej This is the bug Richard added with regard to this issue: http://ellcc.org/bugzilla/show_bug.cgi?id=78

It’s probably not easy to fix because libunwind in llvm only works properly with Apple DWARF binaries, but documentation is a bit sparse.

August 25, 2017 at 4:04 am #79871

Peter Strempel

Hello,

I tested the exception excample from first post with the latest ellcc (2017/08/23), hoping exceptions are working. Unfortunately I cannot get exceptions to be caught, program traps instead:

1) ellcc 2017/08/23: Trapping
$ ecc++ testex.cpp
$ ./a.out
terminating with uncaught exception of type std::runtime_error: test
Abgebrochen (Speicherabzug geschrieben)

2) clang: Catching
$ clang++ testex.cpp
$ ./a.out
Caught exception: test

Looking at the previously mentioned bugtracker entry, it says the issue is resolved with new build system. To be honest, I have no idea what that means. Is the issue now resolved or not? Do I need to build ellcc myself and enable exception handling? I am using the binary distribution (ellcc install && ellcc install libraries).

Overall ellcc looks excellent and would be useful for us, unfortuantely we require exception handling, so non working exceptions are currently holding us back from making use of ellcc in our project.

-Peter

August 25, 2017 at 11:34 am #79872

rich
Keymaster

I reopened the bug. I was trying to clean up bugs that have been made obsolete by recent changes. I guess I was over zealous.

-Rich
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