#error“SSE2指令集未被使能”当包括< emmintrin.h> [英] #error "SSE2 instruction set not enabled" when including <emmintrin.h>

问题描述

我试图用cmake编译一些C ++代码，并使用include < emmintrin.h> 并得到以下make错误：

  #error未启用SSE2指令集
  

我有一个带有Linux（Mint）系统（Kernel 3.5）的Intel Celeron双核处理器。

根据维基百科，Celeron Dual Core能够执行SSE2指令，并且sse2标志根据 / proc / cpuinfo 。但是，此问题的作者提到了有限的SSE支持英特尔赛扬。

我已经尝试在 CMakeLists.txt 中使用SSE编译器选项：

  set（CMAKE_C_FLAGS $ {CMAKE_C_FLAGS}-msse -msse2 -msse3）
  

..但没有改变。 cmake。工作正常，但 make 给出上面的错误消息。

我必须更改CMakeLists.txt中的设置，或者Celeron Dual Core是否（完全）不支持SSE2？

解决方案

您需要致电

   set（CMAKE_C_FLAGS $ {CMAKE_C_FLAGS}-msse -msse2 -msse3 msse3） 

CMAKE_C_FLAGS 应用于C文件，从你的帖子的C ++标签，我想你正在编译C ++文件，因此需要改变 CMAKE_CXX_FLAGS 。

关于引号的定位;在您的原始版本中，您设置 CMAKE_C_FLAGS 以包含2个单独的条目，第一个是 CMAKE_C_FLAGS 第二个是字符串 - msse -msse2 -msse3。

冒号分隔的条目。在 CMAKE_< lang> _FLAGS 的情况下，它们总是由包含所有必需标志的字符串组成的单个值。

I´m trying to compile some C++ code with cmake and make that uses the include <emmintrin.h> and get the following make error:

 #error "SSE2 instruction set not enabled"

I have an Intel Celeron Dual Core processor with a Linux (Mint) system (Kernel 3.5).

According to Wikipedia the Celeron Dual Core is capable to execute SSE2 instructions and the sse2 flag is set according to /proc/cpuinfo. But the author of this question mentions a limited SSE support of the Intel Celeron.

I've already tried to use the SSE compiler options in my CMakeLists.txt:

set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-msse -msse2 -msse3")

..but nothing changed. cmake . works fine but make gives the error message above.

Do I have to change the settings in CMakeLists.txt or does the Celeron Dual Core simply not (fully) support SSE2?

解决方案

You need to call

set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-msse -msse2 -msse3")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse -msse2 -msse3")

The CMAKE_C_FLAGS are applied to C files, and from your post's C++ tag, I guess you're compiling C++ files, hence the need to change CMAKE_CXX_FLAGS instead.

As for the positioning of the quotation marks; in your original version, you were setting CMAKE_C_FLAGS to contain 2 separate entries, the first being the starting value of CMAKE_C_FLAGS and the second being the string "-msse -msse2 -msse3".

CMake holds lists like this as semi-colon separated entries. In the case of CMAKE_<lang>_FLAGS, invariably they are a single value comprised of a string containing all the required flags.

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