ru.linux

 
 - RU.LINUX ---------------------------------------------------------------------
 From : Dennis Vshivkov                      2:5042/7       23 Apr 2001  15:59:44
 To : Arkady Zaharov
 Subject : Re: gcc
 -------------------------------------------------------------------------------- 
 

 
 AZ> Чем отличаются ключики gcc: -march, -mcpu, применительно к x86 ?
 AZ> Hу вот RedHat собирают с такими ключами: -march=i386 -mcpu=i686.
 AZ> Мне тут не все ясно. В gcc-3.* gcc ругается на -m[3-6]86.
 AZ> Говорит надо юзать -march -mcpu.
 
     Имеет право. :)
     
     $ gcc --version
     2.96
 
     info gcc > Invoking GCC > Submodel Options > i386 Options:
 
 Intel 386 Options
 -----------------
 
    These `-m' options are defined for the i386 family of computers:
 
 `-mcpu=CPU TYPE'
      Assume the defaults for the machine type CPU TYPE when scheduling
      instructions.  The choices for CPU TYPE are:
 
      `i386'        `i486'        `i586'        `i686'
      `pentium'     `pentiumpro'  `k6'
 
      While picking a specific CPU TYPE will schedule things
      appropriately for that particular chip, the compiler will not
      generate any code that does not run on the i386 without the
      `-march=CPU TYPE' option being used.  `i586' is equivalent to
      `pentium' and `i686' is equivalent to `pentiumpro'.  `k6' is the
      AMD chip as opposed to the Intel ones.
 
 `-march=CPU TYPE'
      Generate instructions for the machine type CPU TYPE.  The choices
      for CPU TYPE are the same as for `-mcpu'.  Moreover, specifying
      `-march=CPU TYPE' implies `-mcpu=CPU TYPE'.
 
 `-m386'
 `-m486'
 `-mpentium'
 `-mpentiumpro'
      Synonyms for -mcpu=i386, -mcpu=i486, -mcpu=pentium, and
      -mcpu=pentiumpro respectively.  These synonyms are deprecated.
 
     Видно, пора пришла эти deprecated synonyms на пенсию отправить.
 
 -- 
 /Awesome Walrus <walrus@amur.ru>
 Brainbench MVP for Linux - http://www.brainbench.com
 --- tin/1.5.6-20000803/Dust, Linux/2.2.19/i686, 23 days, 22:48:24
  * Origin: AVATAR, беспечный ездок (2:5042/7@fidonet.org)
 
 

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Тема:    Автор:    Дата:    Re: gcc   Dennis Vshivkov   23 Apr 2001 15:59:44   Re^2: gcc   Arkady Zaharov   24 Apr 2001 00:44:20