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    <p>Apart from what lassevk said, you can also use a few other methods of compiler-evaluation (since Delphi 6, I believe) :</p> <pre><code>{$IF NOT DECLARED(SOME_SYMBOL)} // Mind you : The NOT above is optional {$ELSE} {$IFEND} </code></pre> <p>To check if the compiler has this feature, use :</p> <pre><code> {$IFDEF CONDITIONALEXPRESSIONS} </code></pre> <p>There are several uses for this.</p> <p>For example, you could check the version of the RTL; From the Delphi help :</p> <blockquote> <p>You can use RTLVersion in $IF expressions to test the runtime library version level independently of the compiler version level.<br> Example: {$IF RTLVersion >= 16.2} ... {$IFEND}</p> </blockquote> <p>Also, the compiler version itself can be checked, again from the code:</p> <blockquote> <p>CompilerVersion is assigned a value by the compiler when the system unit is compiled. It indicates the revision level of the compiler features / language syntax, which may advance independently of the RTLVersion. CompilerVersion can be tested in $IF expressions and should be used instead of testing for the VERxxx conditional define. Always test for greater than or less than a known revision level. It's a bad idea to test for a specific revision level.</p> </blockquote> <p>Another thing I do regularly, is define a symbol when it's not defined yet (nice for forward-compatiblity), like this :</p> <pre><code> {$IF NOT DECLARED(UTF8String)} type UTF8String = type AnsiString; {$IFEND} </code></pre> <p>Hope this helps!</p>
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    1. PODelphi #IF(DEBUG) equivalent?
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    1. CODeclared(), duh
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    2. CO@user205376 : Thanks for the sharp eye, I fixed the typo.
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