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Hi, I can't debug cores created by programs using threads with my version of gdb (4.16). When starting gdb with such a core file I get the following error : "./core" is not a core dump: File format not recognized To solve this problem I got the tip to use the beta version of gdb located on Your ftp server under ftp://ftp.cygnus.com/private/gdb/gdb-4.16.85.tar.gz. With the commands './configure;make' I was able to build an executable on my Solaris 2.5.1 machine (SPARCstation 4). But when starting the new made debugger with any core file I only receive the following message from gdb : I'm sorry, Dave, I can't do that. Symbol format 'elf32-sparc' unknown. No display number 0. Disabling display 0 to avoid infinite recursion. GDB can't read core files on this machine. So what was my mistake when building gdb. Or is there any other reason why gdb doesn't work on my machine ? I am looking forward getting an answer from You Thomas