如果我没有提供
How can I find out what the -march default argument is for the current architecture if I don't supply any?
推荐答案gcc -dumpmachine 为您提供目标三元组,例如 x86_64-unknown-linux-gnu
gcc -dumpmachine gives you the target triplet, e.g. x86_64-unknown-linux-gnu
如果 gcc -v 显示GCC配置了 - with-arch 选项(或 - with-arch-32 和/或 - with-arch-64 )那么这就是默认设置。
If gcc -v shows GCC was configured with a --with-arch option (or --with-arch-32 and/or --with-arch-64) then that's what will be the default.
没有 - with-arch 选项(并且如果没有使用自定义规格文件),那么所使用的拱将作为目标的默认值。
Without a --with-arch option (and if there isn't a custom specs file in use) then the arch used will be the default for the target.
对于x86,高达并包括GCC 4.4,32位的默认值为 -march = i386 ,而64位为 -march = x86-64 (注意连字符而不是下划线。)
For x86, up to and including GCC 4.4, the default for 32-bit was -march=i386 and for 64-bit was -march=x86-64 (note the hyphen instead of underscore.)
对于使用GCC 4.5及更高版本的x86,默认拱从目标三元组推断,即配置为 i586-pc-linux-gnu 表示默认值为 -march = i586 ,配置为 core2-pc-linux-gnu 表示默认值为 -march = core2 。
For x86 with GCC 4.5 and later versions the default arch is inferred from the target triplet i.e. configuring for i586-pc-linux-gnu means the default is -march=i586, configuring for core2-pc-linux-gnu means the default is -march=core2.
其他一些平台也可以从目标中推断出默认的拱形三联体(自GCC 4.4之前完成),例如 ultrasparc2-sun-solaris2.10 意味着 -march = ultrasparc2 。
Some other platforms also infer the default arch from the target triplet (and have done since before GCC 4.4) so e.g. ultrasparc2-sun-solaris2.10 implies -march=ultrasparc2.
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