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From:	"Dave Korn" <dave DOT korn AT artimi DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: isnan() causes segfault
Date:	Thu, 30 Nov 2006 17:51:07 -0000
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On 30 November 2006 13:26, Eric Lilja wrote:

> The following program stackdumps:
> #include <cmath>
> 
> int
> main()
> {
>     std::isnan(3);
> }
> If compiled with:
> $ g++ -Wall -Wextra -std=c++98 -pedantic -g isnantest.cpp -o run
> (those are the flags we have been using in this course).

  Can't reproduce.  I'm a couple of dll versions behind, I'll see what happens
after an update.

> But it doesn't stackdump if compiled simply with:
> $ make isnantest
> g++     isnantest.cpp   -o isnantest

  This, I can reproduce!

> Comments? cygcheck.out attached.

#1.  Might be informative to use addr2line to figure out exactly where the
thing is crashing: in the dll, or in your executable.

#2.  Re-compile both the crashing and non-crashing versions, using the
--save-temps option, and see if there are any obvious differences in the
assembler source files generated.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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