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| <div class="section" id="cmp0012"> |
| <span id="policy:CMP0012"></span><h1>CMP0012<a class="headerlink" href="#cmp0012" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>if() recognizes numbers and boolean constants.</p> |
| <p>In CMake versions 2.6.4 and lower the if() command implicitly |
| dereferenced arguments corresponding to variables, even those named |
| like numbers or boolean constants, except for 0 and 1. Numbers and |
| boolean constants such as true, false, yes, no, on, off, y, n, |
| notfound, ignore (all case insensitive) were recognized in some cases |
| but not all. For example, the code “if(TRUE)” might have evaluated as |
| false. Numbers such as 2 were recognized only in boolean expressions |
| like “if(NOT 2)” (leading to false) but not as a single-argument like |
| “if(2)” (also leading to false). Later versions of CMake prefer to |
| treat numbers and boolean constants literally, so they should not be |
| used as variable names.</p> |
| <p>The OLD behavior for this policy is to implicitly dereference |
| variables named like numbers and boolean constants. The NEW behavior |
| for this policy is to recognize numbers and boolean constants without |
| dereferencing variables with such names.</p> |
| <p>This policy was introduced in CMake version 2.8.0. CMake version |
| 3.8.2 warns when the policy is not set and uses OLD behavior. Use |
| the cmake_policy command to set it to OLD or NEW explicitly.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">The <code class="docutils literal"><span class="pre">OLD</span></code> behavior of a policy is |
| <span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a> |
| and may be removed in a future version of CMake.</p> |
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