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Top Forums UNIX for Dummies Questions & Answers Compiling with debugger flag -g fixes SEGfault (fortran90) Post 302481519 by drbones on Friday 17th of December 2010 06:37:08 PM
Old 12-17-2010
Compiling with debugger flag -g fixes SEGfault (fortran90)

So the title kinda says it all. I was getting a SEGfault, so I decided to compile with the -g option to find where, and low and behold the SEGfault doesn't occur.

I suppose the answer is "Problem solved! You fixed yet another SEGfault." But I am very curious how this could have happened.

Some info that may help:
1 At first the executable instantly killed itself. After removing some unnecessary variables from the header file, this was fixed. (stack overflow i assume)
2 This is the full compilation command:
ifort -r8 -i4 -mcmodel=large -i-dynamic -align all -g -o code code.f90
3 When compiling without debugger flag messages informing me that loops have been vectorized are printed to screen. Nothing is printed to screen when I compile WITH '-g'.

Thanks!
 

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fixadd(3alleg4) 						  Allegro manual						   fixadd(3alleg4)

NAME
fixadd - Safe function to add fixed point numbers clamping overflow. Allegro game programming library. SYNOPSIS
#include <allegro.h> fixed fixadd(fixed x, fixed y); DESCRIPTION
Although fixed point numbers can be added with the normal '+' integer operator, that doesn't provide any protection against overflow. If overflow is a problem, you should use this function instead. It is slower than using integer operators, but if an overflow occurs it will set `errno' and clamp the result, rather than just letting it wrap. Example: fixed result; /* This will put 5035 into `result'. */ result = fixadd(itofix(5000), itofix(35)); /* Sets `errno' and puts -32768 into `result'. */ result = fixadd(itofix(-31000), itofix(-3000)); ASSERT(!errno); /* This will fail. */ RETURN VALUE
Returns the clamped result of adding `x' to `y', setting `errno' to ERANGE if there was an overflow. SEE ALSO
fixsub(3alleg4), fixmul(3alleg4), fixdiv(3alleg4) Allegro version 4.4.2 fixadd(3alleg4)
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