Re: c/3819

[Reichelt <reichelt@igpm.rwth-aachen.de>]

The following reply was made to PR c/3819; it has been noted by GNATS.

From: Reichelt <reichelt@igpm.rwth-aachen.de>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, iskopovi@mit.edu
Cc:  
Subject: Re: c/3819
Date: Fri, 24 Aug 2001 19:51:32 +0200

 Hi,
 
 this is not a bug in the compiler. (The PR can probably be closed.)
 
 It's not even a real bug in your program.
 The problem is probably the following:
 You declare about 70 30x4000 matrices of the type double,
 which sums up to almost 70 MB of memory usage. Because
 these matrices are local variables in the function main()
 they will be allocated on the stack.
 
 If the stack size is smaller than 70MB your program will
 crash, but it will work if the stack size is larger.
 
 Basically, you have two options:
 a) enlarge your stack size (using the the limit command),
 b) rewrite your program using pointers and malloc (or new in C++)
    to allocate the memory on the heap (which is usually much
    larger) instead of the stack.
 
 Greetings,
 Volker Reichelt
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3819&database=gcc