Re: [boost] question re BOOST_NO_EXCEPTION

25 Oct 2019

      On 10/25/19 3:16 AM, Hans Dembinski via Boost wrote:
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On 24. Oct 2019, at 18:47, Robert Ramey via Boost  wrote:
I want to detect whether or not the -no_exception compile time flag has been used on gcc/clang.  Will BOOST_NO_EXCEPTIONS do this?  If not is there something I can use?
Yes, it does.
Hmmm - I've written a small test which seems to show that it doesn't.

#include 
#include <exception>

int main(int, char *[]){
	#ifdef BOOST_NO_EXCEPTIONS
	throw std::exception();
	#endif
}

I'm still investigating this.
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I would not set this compiler flag by hand, you can use b2 exception-handling=off.
Hmmm - I would not think it's a good idea to make a library component 
dependent on the user using b2 to build it.
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If you use the BOOST_THROW_EXCEPTION macro, you normally do not need to use BOOST_NO_EXCEPTIONS directly. I use BOOST_NO_EXCEPTIONS in some unit tests of throws to avoid warnings about unused variables. Often it is not needed there as well. BOOST_TEST_THROW from boost/core/lightweight_test.hpp automatically expands to a nothing when BOOST_NO_EXCEPTIONS is set, for example.
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