gfortran警告浮点异常 [英] gfortran warn on floating point exception

问题描述

我正在使用gfortran代码。一段时间以来，我一直在使用

  -ffpe-trap = 0，overflow，invalid 
  

试图追捕一些错误。这使我的程序立即停止执行。在某些情况下，FPE可能是正常的，所以如下所示的标志：

  -ffpe-warn =零，溢出，无效
  

将非常有用。 gfortran（或任何其他编译器）是否提供这样的东西？如果没有，是否有任何解决方法？我目前的想法是创建一个C函数来注册一个信号处理程序来写出警告，尽管我不知道该怎么做。

解决方案

我不知道遇到浮点异常的一种警告方式。但是，gfortran和ifort都有信号处理程序。参见例如信号和
英特尔Fortran编译器用户和参考指南（警告：大型PDF）（见第410页）

您可以为呼叫信号的信号建立以下操作之一：

• 忽略指定的信号（由号码标识）。


• 对指定的信号使用默认操作，可以重置先前建立的操作。


• 将控制从指定的信号转移到接收信号的过程，由名称指定。

在您的情况下，您会想要在发生浮点异常时（例如打印文件名/行号）写一个函数来执行某些操作，并使用上面列表中的第三个选项。

不幸的是这不是很便携：看看此页面，了解各种编译器的信号处理示例。如果你想要

• 编译多个编译器


• ，可以在预处理宏中包装一些代码如果设置了一些预处理标志，请使用信号处理例程（参见 -NDEBUG ）

更新：根据High Performance Mark的建议，最终， ieee_exceptions 内在模块的异常处理工具将是便携式的方法。

I'm using gfortran for some code. For a while now, I've been compiling with

-ffpe-trap=zero,overflow,invalid

in an attempt to hunt down some bugs. This causes my program to cease execution immediately. There are some cases where the FPE might be OK and so a flag like:

-ffpe-warn=zero,overflow,invalid

would be very useful. Does gfortran (or any other compiler) provide anything like this? If not, are there any workarounds? My current thought is to create a C function to register a signal handler to write out the warning, although I have no idea how to go about doing that.

解决方案

I don't know of a way of warning on encountering a floating point exception. But both gfortran and ifort have signal handling routines. See for example the gfortran documentation of signal and the Intel Fortran Compiler User and Reference Guides (warning: large PDF) (see page 410 on wards).

You can establish one of the following actions for a signal with a call to signal:

• Ignore the specified signal (identified by number).
• Use the default action for the specified signal, which can reset a previously established action.
• Transfer control from the specified signal to a procedure to receive the signal, specified by name.

In your case, you would want to write a function to do something when a floating point exception occurs (e.g. print file name/line number), and use the third option in the above list.

Unfortunately this is not very portable: take a look at this page for examples of signal handling for various compilers. You could wrap some code in preprocessor macros if you want to

• compile with multiple compilers
• only use the signal handling routines if some preprocessor flag is set (cf. -NDEBUG)

Update: Ultimately the exception handling facilities of the ieee_exceptions intrinsic module would be the portable way to do this, as suggested by High Performance Mark.

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