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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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OCAMLDEBUG(1)						      General Commands Manual						     OCAMLDEBUG(1)

NAME
ocamldebug - the OCaml source-level replay debugger. SYNOPSIS
ocamldebug [ options ] program [ arguments ] DESCRIPTION
ocamldebug is the OCaml source-level replay debugger. Before the debugger can be used, the program must be compiled and linked with the -g option: all .cmo and .cma files that are part of the program should have been created with ocamlc -g, and they must be linked together with ocamlc -g. Compiling with -g entails no penalty on the running time of programs: object files and bytecode executable files are bigger and take longer to produce, but the executable files run at exactly the same speed as if they had been compiled without -g. OPTIONS
A summary of options are included below. For a complete description, see the html documentation in the ocaml-doc package. -c count Set the maximum number of simultaneously live checkpoints to count. -cd dir Run the debugger program from the working directory dir, instead of the current working directory. (See also the cd command.) -emacs Tell the debugger it is executed under Emacs. (See The OCaml user's manual for information on how to run the debugger under Emacs.) -I directory Add directory to the list of directories searched for source files and compiled files. (See also the directory command.) -s socket Use socket for communicating with the debugged program. See the description of the command set socket in The OCaml user's manual for the format of socket. -version Print version string and exit. -vnum Print short version number and exit. -help or --help Display a short usage summary and exit. SEE ALSO
ocamlc(1) The OCaml user's manual, chapter "The debugger". AUTHOR
This manual page was written by Sven LUTHER <luther@debian.org>, for the Debian GNU/Linux system (but may be used by others). OCAMLDEBUG(1)
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