如何使用CMake启用链接时间优化（LTO）？ [英] How do I enable link time optimization (LTO) with CMake?

问题描述

我具有最新的cmake构建，并尝试了所有构建配置（Debug，MinSizeRel，RelWithDebugInfo，Release，General），但在生成的makefile中，字符串 -lto ，或者功能仍然不存在，或者需要手动换档（在这种情况下，对文档进行LTO或链接时间优化的文本搜索）不会产生任何结果，因此我在官方文档中看不到任何启用方法LTO。

是否有任何方法可以全局启用（对于所有编译器）LTO，而无需手动指定可能仅由GCC支持的标志？

解决方案

编辑：截至2015年10月28日，在CMake IRC上

  jcelerier |我对INTERPROCEDURAL_OPTIMIZATION 
 jcelerier有疑问|听起来应该在gcc 
 + ngladitz上启用-flto | jcelerier：仅针对intel编译器
实现。 ngladitz：好的，
 jcelerier | pgo / lto还有其他开关吗？ 
 jcelerier |还是必须手工完成？ 
 + ngladitz |当前没有一流的支持，否则
  

相关的CMake问题： https://gitlab.kitware.com/cmake/cmake/issues/15245

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CMake在目标上具有 INTERPROCEDURAL_OPTIMIZATION 属性，这听起来像可以在某些平台上启用LTO。 / p>

链接： http://www.cmake.org/cmake/help/v3.0/prop_tgt/INTERPROCEDURAL_OPTIMIZATION.html

要在目标MyLib上启用它：

  add_library（MyLib ...）
 ... 
 set_property（TARGET MyLib PROPERTY INTERPROCEDURAL_OPTIMIZATION True ）
  

I have the most recent cmake build and trying all build configurations (Debug, MinSizeRel, RelWithDebugInfo, Release, General) I see nowhere (text search) in generated makefiles the string -lto, so or the functionality is still not present, or it requires manual intervertion (in that case a text search for LTO or Link time optimization) over the documentation gives no result, so I see nowhere in official documentation a way to enable LTO.

Is there any way to enable LTO "globally" (for all compilers) without specifying manually flags that could be at worst supported only by GCC?

解决方案

Edit: as of 28 October, 2015 on CMake IRC

jcelerier | I have a question about INTERPROCEDURAL_OPTIMIZATION
jcelerier | it sounds like it should enable -flto on gcc
+ngladitz | jcelerier: its only implemented for the intel compiler
jcelerier | ngladitz: ah, okay
jcelerier | are there other switches for pgo / lto ?
jcelerier | or must it be done by hand ?
+ngladitz | there currently is no first class support otherwise     

Related CMake issue: https://gitlab.kitware.com/cmake/cmake/issues/15245

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CMake has the INTERPROCEDURAL_OPTIMIZATION property on targets, which sounds like it may enable LTO on some platforms.

Link : http://www.cmake.org/cmake/help/v3.0/prop_tgt/INTERPROCEDURAL_OPTIMIZATION.html

To enable it on a target MyLib :

add_library(MyLib ...)
...
set_property(TARGET MyLib PROPERTY INTERPROCEDURAL_OPTIMIZATION True)

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