Resource leaks and undefined behavior may result when a C++ exception is thrown. The default exception unwinding code doesn't destroy automatic C++ objects outside of try blocks that go out of scope because of an exception. However, it also generates code that only partially supports C++ exceptions. By default (that is, if no /EHsc, /EHs, or /EHa option is specified), the compiler supports SEH handlers in the native C++ catch(.) clause. The compiler always generates code that supports asynchronous structured exception handling (SEH). Remarks Default exception handling behavior For example, /EHr- /EHc /EHs is the same as /EHscr-, and /EHscr- /EHr has the same effect as /EHscr. If more than one instance of the same argument is specified, the last one overrides any earlier ones. EH arguments may be specified separately or combined, in any order. For example, /EHsc- is interpreted as /EHs /EHc-, and is equivalent to /EHs. EHr is ignored if /EHs or /EHa aren't specified.Ĭlears the previous option argument. This option gives strict C++ conformance at the cost of some extra code. By default, runtime checks for noexcept may be optimized away if the compiler determines the function calls only non-throwing functions. Tells the compiler to always generate runtime termination checks for all noexcept functions. EHc is ignored if /EHs or /EHa aren't specified. It has no effect when used with /EHa (that is, /EHca is equivalent to /EHa). When used with /EHs, the compiler assumes that functions declared as extern 'C' never throw a C++ exception. Unless /EHc is also specified, the compiler assumes that functions declared as extern 'C' may throw a C++ exception.

Catches only standard C++ exceptions when you use catch(.) syntax. EHa overrides both /EHs and /EHc arguments.Įnables standard C++ stack unwinding. Catches both structured (asynchronous) and standard C++ (synchronous) exceptions when you use catch(.) syntax. SyntaxĮnables standard C++ stack unwinding. Arguments specify whether to apply catch(.) syntax to both structured and standard C++ exceptions, whether extern 'C' code is assumed to throw exceptions, and whether to optimize away certain noexcept checks. Specifies the exception handling model support generated by the compiler.

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