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The script gdb_buildall.sh builds GDB with flag --enable-targets=all set. This builds GDB with all supported targets activated. This helps testing GDB when doing changes that affect more than one architecture and is much faster than using gdb_mbuild.sh.
After building GDB the script checks which architectures are supported and then switches the current architecture to each of those to get information about the architecture. The test results are stored in log files in the directory the script was called from.