[cfe-dev] [llvm-dev] [RFC][libcxx] Fix and maintain the no-exceptions build of libcxx

[Martin J. O'Riordan via cfe-dev]

The WG21 ISO C++ committee did compile a Technical Report on the needs of embedded systems, with particular attention to the impact on libraries of Exception Handling and Locales.  This TR was not "Embedded C++" which was essentially C++ with all of its teeth removed; and instead tried to advise how implementers could construct compliant C++ compilers and libraries that better suited the Embedded Systems environment; sub-setting was considered undesirable as it implied 2 Standards for C++, but a more modular use of and implementation the languages features was considered achievable.

This Technical Report was written over a period of 5 years and we even prototyped libraries based on its findings.  It would need to be updated to track developments in the language since, in particular threads and synchronisation abstractions, but most of it is still as valid today as it was 9 years ago.

The document (if you can get access to it) is:

	ISO/IEC TR 18015:2006(E)
	Technical Report on C++ Performance

However, once we completed that TR I have never heard anything about it since.  Also, when I went to the NCITS web-site, it was selling for a huge price (~$500) which puts it well out of the reach of normal people.

	Martin O'Riordan - Movidius Ltd.

-----Original Message-----
From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of David Chisnall via llvm-dev
Sent: 04 November 2015 8:29
To: Marshall Clow
Cc: llvm-dev at lists.llvm.org; cfe-dev at lists.llvm.org
Subject: Re: [llvm-dev] [cfe-dev] [RFC][libcxx] Fix and maintain the no-exceptions build of libcxx

On 2 Nov 2015, at 16:23, Marshall Clow via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> I find it amusing that you think that there's a "correct behavior" when the standard specifies that an operation should throw an exception and you have disabled exceptions.

This is possibly something that the standards committee should address.  There are lots of situations where you don’t want to enable exceptions, and it would be nice to have an official, standard version of C++ that would work in this situation.  Embedded C++ tried, but threw away too much to be useful in practice.  Is there a subcommittee looking at this kind of use?

David

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