core/com.nokia.carbide.cpp.compiler.doc.user/html/pragmas/p_strictheaderchecking.htm
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<h3>strictheaderchecking</h3>
<p>Controls how strictly the compiler checks headers for standard C library functions.</p>
<h5>Syntax</h5>
<p class="code">#pragma strictheaderchecking on | off | reset</p>
<h5>Targets</h5>
All platforms.<br />
<h5>Remarks</h5>
<p>The 3.2 version compiler recognizes standard C library functions. If the correct prototype is used, and, in C++, if the function appears in the “std” or root namespace, the compiler recognizes the function, and is able to optimize calls to it based on its documented effects.</p>
<p>When this pragma is on, in addition to having the correct prototype, the declaration must also appear in the proper standard header file (and not in a user header or source file).</p>
<p>This pragma does not correspond to any panel setting. The default setting is <span class="code">on</span>.</p>
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