blocks|key|735131|text|您可以使用-Q+--help=target选项：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|735132|gcc+-march=native+-Q+--help=target+...|code-block|syntax|javascript|735133|-v选项也可能有用。|735134|您可以在--help选项here上查看文档。|735135|entityMap|0|LINK|mutability|MUTABLE|url|http://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Overall-Options.html#Overall-Options^0|5|G|0|0|0|2|0|4|6|C|4|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|O|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

You can use the <code>-Q --help=target</code> options:

<pre><code>gcc -march=native -Q --help=target ...
</code></pre>

The <code>-v</code> option may also be of use.

You can see the documentation on the <code>--help</code> option <a href="http://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Overall-Options.html#Overall-Options" rel="noreferrer">here</a>.

blocks|key|735210|text|要查看命令行标志，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|735211|gcc+-march=native+-E+-v+-+</dev/null+2>&1+%7C+grep+cc1|code-block|syntax|javascript|735212|如果您希望看到由某些参数设置的编译器/预编译器定义，请执行以下操作：|735213|echo+%7C+gcc+-dM+-E+-+-march=native|735214|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To see command-line flags, use:

<pre><code>gcc -march=native -E -v - &lt;/dev/null 2&gt;&amp;1 | grep cc1
</code></pre>

If you want to see the compiler/precompiler defines set by certain parameters, do this:

<pre><code>echo | gcc -dM -E - -march=native
</code></pre>

blocks|key|951387|text|它应该是(-###类似于-v)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|951388|echo+%7C+gcc+-###+-E+-+-march=native+|code-block|syntax|javascript|951389|为gcc展示“真正的”本土旗帜。|951390|你可以用一个命令让它们看起来更“清晰”：|951391|gcc+-###+-E+-+-march=native+2>&1+%7C+sed+-r+'/cc1/!d;s/(")%7C(%5E.*+-+)//g'|951392|你可以用-mno-*去掉标志：|951393|gcc+-###+-E+-+-march=native+2>&1+%7C+sed+-r+'/cc1/!d;s/(")%7C(%5E.*+-+)%7C(+-mno-[%5E\+]%2B)//g'|951394|entityMap^0|5|4|C|2|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|13|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|15|8|@]|D|@]|E|$]]|$1|S|3|T|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

It should be (<code>-###</code> is similar to <code>-v</code>):

<pre><code>echo | gcc -### -E - -march=native 
</code></pre>

To show the "real" native flags for gcc.

You can make them appear more "clearly" with a command:

<pre><code>gcc -### -E - -march=native 2&gt;&amp;1 | sed -r '/cc1/!d;s/(")|(^.* - )//g'
</code></pre>

and you can get rid of flags with -mno-* with:

<pre><code>gcc -### -E - -march=native 2&gt;&amp;1 | sed -r '/cc1/!d;s/(")|(^.* - )|( -mno-[^\ ]+)//g'
</code></pre>

blocks|key|735384|text|如果您想了解如何设置非本机交叉编译，我发现这很有用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|735385|在目标机器上，|735386|%25+gcc+-march=native+-Q+--help=target+%7C+grep+march
-march=+++++++++++++++++++++++++++++++core-avx-i|code-block|syntax|javascript|735387|然后在构建机器上使用以下代码：|735388|%25+gcc+-march=core-avx-i+...|735389|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|$]]

If you want to find out how to set-up a non-native cross compile, I found this useful:

On the target machine, 

<pre><code>% gcc -march=native -Q --help=target | grep march
-march= core-avx-i
</code></pre>

Then use this on the build machine:

<pre><code>% gcc -march=core-avx-i ...
</code></pre>

I'm compiling my C++ app using GCC 4.3. Instead of manually selecting the optimization flags I'm using <code>-march=native</code>, which in theory should add all optimization flags applicable to the hardware I'm compiling on. But how can I check which flags is it actually using?

How to see which flags -march=native will activate?

编译器

我正在使用GCC 4.3编译我的C++应用程序。我使用的是-march=native，而不是手动选择优化标志，理论上它应该添加适用于我正在编译的硬件的所有优化标志。但是我如何检查它实际使用的是哪些标志呢？

问如何查看-march=native将激活哪些标志？
EN

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问如何查看-march=native将激活哪些标志？
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