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Re: Help, my MathLink Examples segfault.

  • To: mathgroup at
  • Subject: [mg23219] Re: Help, my MathLink Examples segfault.
  • From: paulh at (P.J. Hinton)
  • Date: Mon, 24 Apr 2000 01:12:26 -0400 (EDT)
  • Organization: "Wolfram Research, Inc."
  • References: <8domf0$>
  • Sender: owner-wri-mathgroup at

In article <8domf0$jng at>,
 raholcom at (Richard Allan Holcombe) writes:

> I would like to use mathlink.  I downloaded the DeveloperKit, and the makefile
> successfully compiled the example programs, but when I run the programs,
> they crash.  I am running mathematica 3.0 for students, on RedHat6.1 Linux 
> I have the latest mathlink.h, mathML.a files, and the 
> PrebuiltExamples work fine.  When run through gdb I get:
> (gdb) run
> Starting program: /home/raholcom/mma/AddOns/MathLink/DevelopersKits/Linux/MathLinkExamples/reverse 
> Program received signal SIGSEGV, Segmentation fault.
> 0x4008cb57 in __uflow (fp=0x80783c8) at genops.c:328
> 328	genops.c: No such file or directory.
> (gdb) where
> #0  0x4008cb57 in __uflow (fp=0x80783c8) at genops.c:328
> #1  0x40088e65 in _IO_getline_info (fp=0x80783c8, buf=0xbffff874 "", n=254, 
>     delim=10, extract_delim=1, eof=0x0) at iogetline.c:67
> #2  0x40088e16 in _IO_getline (fp=0x80783c8, buf=0xbffff874 "", n=254, 
>     delim=10, extract_delim=1) at iogetline.c:39
> #3  0x40088610 in _IO_fgets (buf=0xbffff874 "", n=255, fp=0x80783c8)
>     at iofgets.c:48
> #4  0x8069df1 in MLRequest_unix ()
> #5  0x804d05d in default_request_argv ()
> #6  0x804ce96 in MLRequestArgv ()
> #7  0x804bd1f in mlopen_argv ()
> #8  0x804bbe2 in MLOpenArgv ()
> #9  0x804a6d7 in _MLMain ()
> #10 0x804a878 in MLMain ()
> #11 0x804a044 in main ()
> #12 0x4004f1eb in __libc_start_main (main=0x804a034 <main>, argc=1, 
>     argv=0xbffffa74, init=0x8049b20 <_init>, fini=0x80761bc <_fini>, 
>     rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffa6c)
>     at ../sysdeps/generic/libc-start.c:90
> Does anyone know how to fix this?  

The version of GCC for Red Hat Linux 6.x distributions links against
version 2.1 of the GNU C runtime library.  You must download a 
specially compiled version of libML.a from the WRI Technical Support
website.  See this URL:

This issue is not limited to Red Hat 6.x.  You will also find that
this is the case for recent releases of other Linux distributions
such as SuSE 6.2 and Caldera OpenLinux 2.3.

P.J. Hinton
Mathematica Programming Group           paulh at
Wolfram Research, Inc.
Disclaimer: Opinions expressed herein are those of the author alone.

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