COMPILER_OPTIONS（）应该在Fortran中返回什么？ [英] What should COMPILER_OPTIONS() return in Fortran?

问题描述

Fortran 2008添加了一个名为COMPILER_OPTIONS（）的新程序，该程序根据 GNU文档

a>应该返回一个字符串，其中包含用于编译文件的选项。根据 Fortran 2003状态wiki ，几乎所有的编译器，包括GNU和PGI，都似乎支持此功能。

我创建了一个简单的程序 COMPILER_OPTIONS.f08 显示如下

 使用iso_fortran_env 
 print'（4a）'，'这个文件是使用options'编译的，compiler_options（）
 end 
  

下面是我从 gfortran 和<$ c没有编译时间选项的Gfortran 5.4

$ b

$ b

  $ gfortran COMPILER_OPTIONS.f08&& ./a.out 
这个文件是通过使用选项-mtune = generic -march = x86-64 
  

Gfortran 5.4与-O3在编译时通过

  $ gfortran -O3 COMPILER_OPTIONS.f08&& ./a.out 
使用选项-mtune = generic -march = x86-64 -O3 
  

$ b $编译此文件b

PGI 17.4没有在编译时通过的选项

  $ pgfortran COMPILER_OPTIONS.f08&& ./a.out 
这个文件是使用COMPILER_OPTIONS.f08 
  

PGI 17.4 with -O3在编译时通过

  $ pgfortran -O3 COMPILER_OPTIONS.f08&& ./a.out 
使用选项COMPILER_OPTIONS.f08 -O3 -Mvect = sse -Mcache_align -Mpre 
  

$ b编译此文件
$ b

鉴于上述输出，我有以下问题：
$ b $ ol

什么是COMPILER_OPTIONS每Fortran 2008？

b

编辑 strong>：从-o3（输出文件3）将标志更改为-O3（优化级别3）。感谢Pierre和francescalus的反馈。 解决方案

Fortran 2008描述了函数（13.8.2.6）：

$ b

描述控制程序转换阶段选项的处理器相关字符串。

这个函数返回一个默认字符标量和处理器相关的长度。

编译器的自由度非常大。这里提供的结果没有迹象表明任何违规行为。

Fortran 2008 added a new procedure called COMPILER_OPTIONS() which according to GNU documentation should return a string with the options used for compiling the file. According to Fortran 2003 status wiki, almost all compilers including GNU and PGI seem to support this feature.

I created a simple program COMPILER_OPTIONS.f08 shown below

use iso_fortran_env
   print '(4a)', 'This file was compiled by using the options ', compiler_options()
end

Here are my results from gfortran and pgfortran

Gfortran 5.4 with no compile time options

$ gfortran COMPILER_OPTIONS.f08 && ./a.out 
This file was compiled by using the options -mtune=generic -march=x86-64

Gfortran 5.4 with -O3 passed at compile time

$ gfortran -O3 COMPILER_OPTIONS.f08 && ./a.out 
This file was compiled by using the options -mtune=generic -march=x86-64 -O3

PGI 17.4 with no option passed at compile time

$ pgfortran COMPILER_OPTIONS.f08 && ./a.out 
This file was compiled by using the options COMPILER_OPTIONS.f08 

PGI 17.4 with -O3 passed at compile time

$ pgfortran -O3 COMPILER_OPTIONS.f08 && ./a.out 
This file was compiled by using the options COMPILER_OPTIONS.f08 -O3 -Mvect=sse -Mcache_align -Mpre 

Given the above output, I have following questions

1. What is COMPILER_OPTIONS() procedure expected to return as per Fortran 2008?
2. What is the status of support across different compilers?

EDIT : Changed flag to -O3 (Optimization Level 3) from -o3 (Output file 3). Thanks to the feedback from Pierre and francescalus.

解决方案

Fortran 2008 describes the function as (13.8.2.6):

Processor-dependent string describing the options that controlled the program translation phase.

This function returns a "default character scalar with processor-dependent length."

That's an awful lot of freedom for a compiler. There's no indication from the results presented here to suggest any non-compliance.

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