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| <span id="module:FindFLEX"></span><h1>FindFLEX<a class="headerlink" href="#findflex" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Find flex executable and provides a macro to generate custom build rules</p> |
| <p>The module defines the following variables:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">FLEX_FOUND</span> <span class="o">-</span> <span class="n">true</span> <span class="ow">is</span> <span class="n">flex</span> <span class="n">executable</span> <span class="ow">is</span> <span class="n">found</span> |
| <span class="n">FLEX_EXECUTABLE</span> <span class="o">-</span> <span class="n">the</span> <span class="n">path</span> <span class="n">to</span> <span class="n">the</span> <span class="n">flex</span> <span class="n">executable</span> |
| <span class="n">FLEX_VERSION</span> <span class="o">-</span> <span class="n">the</span> <span class="n">version</span> <span class="n">of</span> <span class="n">flex</span> |
| <span class="n">FLEX_LIBRARIES</span> <span class="o">-</span> <span class="n">The</span> <span class="n">flex</span> <span class="n">libraries</span> |
| <span class="n">FLEX_INCLUDE_DIRS</span> <span class="o">-</span> <span class="n">The</span> <span class="n">path</span> <span class="n">to</span> <span class="n">the</span> <span class="n">flex</span> <span class="n">headers</span> |
| </pre></div> |
| </div> |
| <p>The minimum required version of flex can be specified using the |
| standard syntax, e.g. find_package(FLEX 2.5.13)</p> |
| <p>If flex is found on the system, the module provides the macro:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">FLEX_TARGET</span><span class="p">(</span><span class="n">Name</span> <span class="n">FlexInput</span> <span class="n">FlexOutput</span> |
| <span class="p">[</span><span class="n">COMPILE_FLAGS</span> <span class="o"><</span><span class="n">string</span><span class="o">></span><span class="p">]</span> |
| <span class="p">[</span><span class="n">DEFINES_FILE</span> <span class="o"><</span><span class="n">string</span><span class="o">></span><span class="p">]</span> |
| <span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>which creates a custom command to generate the <FlexOutput> file from |
| the <FlexInput> file. If COMPILE_FLAGS option is specified, the next |
| parameter is added to the flex command line. If flex is configured to |
| output a header file, the DEFINES_FILE option may be used to specify its |
| name. Name is an alias used to get details of this custom command. |
| Indeed the macro defines the following variables:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span>FLEX_${Name}_DEFINED - true is the macro ran successfully |
| FLEX_${Name}_OUTPUTS - the source file generated by the custom rule, an |
| alias for FlexOutput |
| FLEX_${Name}_INPUT - the flex source file, an alias for ${FlexInput} |
| FLEX_${Name}_OUTPUT_HEADER - the header flex output, if any. |
| </pre></div> |
| </div> |
| <p>Flex scanners oftenly use tokens defined by Bison: the code generated |
| by Flex depends of the header generated by Bison. This module also |
| defines a macro:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">ADD_FLEX_BISON_DEPENDENCY</span><span class="p">(</span><span class="n">FlexTarget</span> <span class="n">BisonTarget</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>which adds the required dependency between a scanner and a parser |
| where <FlexTarget> and <BisonTarget> are the first parameters of |
| respectively FLEX_TARGET and BISON_TARGET macros.</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="o">====================================================================</span> |
| <span class="n">Example</span><span class="p">:</span> |
| </pre></div> |
| </div> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">find_package</span><span class="p">(</span><span class="n">BISON</span><span class="p">)</span> |
| <span class="n">find_package</span><span class="p">(</span><span class="n">FLEX</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="highlight-default"><div class="highlight"><pre><span></span>BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp) |
| FLEX_TARGET(MyScanner lexer.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp) |
| ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser) |
| </pre></div> |
| </div> |
| <div class="highlight-default"><div class="highlight"><pre><span></span> include_directories(${CMAKE_CURRENT_BINARY_DIR}) |
| add_executable(Foo |
| Foo.cc |
| ${BISON_MyParser_OUTPUTS} |
| ${FLEX_MyScanner_OUTPUTS} |
| ) |
| ==================================================================== |
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