# earlier entries taking precedence over later entries. So loose patterns
# at the end of the list can give defaults.
-# The ABI tag values we use are 32-bit quantities stored in machine byte order.
-# Conventionally the high-order byte indicates the OS and the low three
-# bytes form a version number associated with a particular ABI version.
+# The ABI tags we use are four 32-bit integers. The first of these
+# is the operating-system number, the next three are the revision number
+# of the first compatible kernel.
# After the configuration regexp, four integers in C syntax appear
# surrounded by any whitespace or punctuation, one for each byte, MSB first.
.*-.*-gnu-gnu.* 1 0.0.0
-sparc-sun-solaris2.* 2 2.0.0 # just an arbitrary value
+.*-sun-solaris2.* 2 2.0.0 # just an arbitrary value
+
+.*-.*-freebsd.*-gnu.* 3 4.0.0 # earliest compatible kernel version
+
+.*-.*-knetbsd.*-gnu.* 4 1.6.0 # earliest compatible kernel version
+
+.*-.*-syllable.* 5 2.0.0 # just an arbitrary value
# There is no catch-all default here because every supported OS that uses
# ELF must have its own unique ABI tag.