diff -urpN src/gdb/doc/gdbint.texinfo dev/gdb/doc/gdbint.texinfo
--- src/gdb/doc/gdbint.texinfo	2008-01-29 09:48:39.000000000 +0100
+++ dev/gdb/doc/gdbint.texinfo	2008-02-11 08:19:44.000000000 +0100
@@ -7058,6 +7058,20 @@ is so old that it has never been convert
 
 @end table
 
+@section Build Script
+
+@cindex build script
+
+The script @code{gdb_buildall.sh} builds GDB with flag
+@code{--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 @code{gdb_mbuild.sh}.
+
+After building GDB the scripts 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.
+
 @include observer.texi
 @raisesections
 @include fdl.texi