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    <p>Let me paraphrase question to be more accurate in my answer:</p> <blockquote> <p>Can runtime assert <strong>sometimes</strong> report errors on compile time.</p> </blockquote> <p>Gcc can, but only on some optimization level and error message is very uninformative. Clang itself can't (no error attribute), but do not forget about clang <strong>analyzer</strong>. Analyzer can report some runtime errors like dereferencing null pointer.</p> <p>So here is an idea and simple test of 'smart' runtime assert:</p> <pre><code>#include &lt;cstdlib&gt; // std::abort #if !defined(__clang__) &amp;&amp; defined(__GNUC__) // clang emulates gcc # define GCC_COMPILER 1 #else # define GCC_COMPILER 0 #endif #if GCC_COMPILER void assertion_failed_message() __attribute__((__error__("assertion failed"))); #endif inline void smart_assert(bool condition) { #if GCC_COMPILER // gcc is very 'sensitive', it must be first code lines in this function if (__builtin_constant_p(condition) &amp;&amp; !condition) { assertion_failed_message(); } #endif if (condition) { // Ok return; } #if defined(__clang_analyzer__) enum { ASSERTION_FAILED = 0xdeadfull }; int *a = nullptr; *a = ASSERTION_FAILED; #endif // Implement some standart error, like abort std::abort(); } void test_condition_2(bool condition) { smart_assert(condition); } void test_condition_1(bool condition) { test_condition_2(condition); } void test_condition_0(bool condition) { test_condition_1(condition); } int main() { test_condition_0(0==1); return EXIT_SUCCESS; } </code></pre> <p>Gcc report error at O2 optimization level, it's good. But report message is in main function, and don't leave any information about test_condition_{0,1,2}.</p> <p>Clang analyzer report error and if you use Xcode, you can see all path from main to smart_assert: <img src="https://i.stack.imgur.com/ivjo6.png" alt="clang_analyzer_report"></p> <p><strong>P.S.</strong> clang analyzer is not perfect, so if you try test_condition_0(argc), no error will be reported (truely runtime check), but if you try test_condition_0(argc==1), false positive will be reported.</p>
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    1. POStatic assertion if possible, dynamic assertion otherwise?
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    1. COThis might be "smart" but it's also disgusting. +1 anyway, but ... eurgh.
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      1. USJonathan Wakely
 

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