o a path to
the external toolchain and will be passed to the compiler driver if supported.</p>
<p>This variable may only be set in a toolchain file specified by
the <span class="target" id="index-0-variable:CMAKE_TOOLCHAIN_FILE"></span><a class="reference internal" href="CMAKE_TOOLCHAIN_FILE.html#variable:CMAKE_TOOLCHAIN_FILE" title="CMAKE_TOOLCHAIN_FILE"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_TOOLCHAIN_FILE</span></code></a> variable.</p>
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