blocks|key|747223|text|有两种选择。您可以使用add_definitions方法将定义作为编译器标志进行传递:例如，在项目cmakelists.txt中的某个位置：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|747224|add_definitions(+-DUSE_NEW_CACHE+)|code-block|syntax|javascript|747225|CMake将确保-D前缀转换为您的编译器的正确标志(+msvc为/D，gcc为-D+)。|747226|或者，也可以查看configure_file。它比较复杂，但可能更适合使用Platform_Config文件的原始方法。|747227|您可以创建一个输入文件，类似于您的原始Platform_Config.h，并在其中添加"#cmakedefine“行。|747228|让我们调用Platform_Config.h.in：|747229|//+In+Platform_Config.h.in
#cmakedefine+USE_NEW_CACHE
//+end+of+Platform_Config.h.in|747230|然后运行时|747231|configure_file(+${CMAKE_SOURCE_DIR}/Platform_Config.h.in+${CMAKE_BINARY_DIR}/common/Platform_Config.h+)|747232|它将在您的构建目录中生成一个新的Platform_Config文件。cmake中的变量也是cmakedefine，它们将出现在生成的文件中，其他变量将被注释掉或未定义。|747233|当然，您应该确保在将实际生成的文件包含在源文件中时，能够正确地找到它。|747234|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command%253aadd_definitions|1|http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command%253aconfigure_file^0|B|F|0|0|0|0|8|E|1|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|D|3|E|5|F|7|1E|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1F|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|M|3|N|5|6|7|1K|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1L|8|@]|9|@]|C|$]]|$1|Q|3|R|5|F|7|1M|8|@]|9|@]|C|$G|H]]|$1|S|3|T|5|6|7|1N|8|@]|9|@]|C|$]]|$1|U|3|V|5|F|7|1O|8|@]|9|@]|C|$G|H]]|$1|W|3|X|5|6|7|1P|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|10|3|-4|5|6|7|1R|8|@]|9|@]|C|$]]]|11|$12|$5|13|14|15|C|$16|17]]|18|$5|13|14|15|C|$16|19]]]]

There are two options. You can use the <a href="http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command%3aadd_definitions">add_definitions</a> method to pass defines as compiler flags: E.g. somewhere in your projects cmakelists.txt:

<pre><code>add_definitions( -DUSE_NEW_CACHE )
</code></pre>

CMake will make sure the -D prefix is converted to the right flag for your compiler (/D for msvc and -D for gcc).

Alternatively, check out <a href="http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command%3aconfigure_file">configure_file</a>. It is more complex, but may be better suited to your original approach with a Platform_Config file. 

You can create an input-file, similar to your original Platform_Config.h and add "#cmakedefine" lines to it. 

Let's call in Platform_Config.h.in:

<pre><code>// In Platform_Config.h.in
#cmakedefine USE_NEW_CACHE
// end of Platform_Config.h.in
</code></pre>

When then running 

<pre><code>configure_file( ${CMAKE_SOURCE_DIR}/Platform_Config.h.in ${CMAKE_BINARY_DIR}/common/Platform_Config.h )
</code></pre>

it will generate a new Platform_Config file in your build-dir. Those variables in cmake which are also a cmakedefine will be present in the generated file, the other ones will be commented out or undefed.

Of course, you should make sure the actual, generated file is then correctly found when including it in your source files.

blocks|key|963108|text|如果你想设置每个目标的定义:从2.8.11开始，你可以使用target_compile_definitions。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|963109|在早期版本中，您可能不希望按原样使用set_target_properties，因为它会覆盖您先前设置的任何定义。请先调用get_target_property，然后再与以前的值合并。参见add_target_definitions+here。|963110|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cmake.org/cmake/help/v3.0/command/target_compile_definitions.html|1|http://code.google.com/p/rstm/source/browse/trunk/cmake/modules/AddTargetDefinitions.cmake?r=58^0|T|Q|T|Q|0|0|I|L|1P|J|2M|M|39|4|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]]|E|$]]|$1|H|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

In case you want to set defines per target: Since 2.8.11 you can use <a href="http://www.cmake.org/cmake/help/v3.0/command/target_compile_definitions.html" rel="nofollow"><code>target_compile_definitions</code></a>.

In earlier versions you probably don't want to use <code>set_target_properties</code> as is, since it overwrites any defines you set previously. Call <code>get_target_property</code> first instead, then merge with previous values. See <code>add_target_definitions</code> <a href="http://code.google.com/p/rstm/source/browse/trunk/cmake/modules/AddTargetDefinitions.cmake?r=58" rel="nofollow">here</a>.

blocks|key|963156|text|使用target_compile_options。不要引用您的定义，否则它不会被检测为定义。CMake解析/define并将实际的定义添加到csproj的DefineConstants部分，如果有引号，它会将整个带引号的字符串放入csproj的AdditionalOptions部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|963157|下面是我的一个项目中使用生成器表达式的示例：|963158|target_compile_options(+${LIBRARY_NAME}+PRIVATE
++++$<${IS_ART_ITERATION_BUILD}:/define:ART_ITERATION_BUILD>
)|code-block|syntax|javascript|963159|没有生成器表达式的示例：|963160|target_compile_options(+${LIBRARY_NAME}+PRIVATE
++++/define:GRAPHICS_VULKAN
)|963161|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Use target_compile_options. Do not quote your define or it not be detected as a define. CMake parses off the /define and adds the actual define to the DefineConstants section of the csproj, if there are quotes it will put the entire quoted string in the AdditionalOptions section of the csproj.
An example from one of my projects that uses generator expressions:
<pre><code>target_compile_options( ${LIBRARY_NAME} PRIVATE
 $&lt;${IS_ART_ITERATION_BUILD}:/define:ART_ITERATION_BUILD&gt;
)
</code></pre>
An example without generator expressions:
<pre><code>target_compile_options( ${LIBRARY_NAME} PRIVATE
 /define:GRAPHICS_VULKAN
)
</code></pre>

I feel a little stupid right now. After recently converting a few smaller projects to use CMake, I decided to also get rid of a few "Platform_Config.h" files. These files contain a few preprocessing directives like <code>#define USE_NEW_CACHE</code> and control compilation.

How would I 'convert' these defines to be controlled with CMake? Ideally by using these "cache" variables the user can easily edit.

How to create a C #define for a certain target using CMake?

编译器

我觉得现在有点傻。在最近将一些较小的项目转换为使用CMake之后，我决定也去掉一些"Platform_Config.h“文件。这些文件包含一些预处理指令，如#define USE_NEW_CACHE和控件编译。我如何将这些定义‘转换’为CMake控制？理想情况下，通过使用这些“缓存”变量，用户可以轻松地进行编辑。

问如何使用CMake为某个目标创建C#定义？
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