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/usr/share/lintian/data/binaries/arch-regex is in lintian 2.5.22ubuntu1.

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# Manually maintained table of architectures and their "file(1)"
# signature.  Table based on checks/emdebian's %archdetecttable, as
# found in emdebian-tools.
# 
# syntax:
#   key ~~regex
#
# Note spaces on the right hand side of ~~ are assumed to be a part
# of the regex.
#
# Please keep this sorted based on the arch names.

# Phony architectures used for some special cases, where Lintian just
# requires the number of "bits" to be correct.
# 
32            ~~ELF 32-bit
64            ~~ELF 64-bit

# Regular architectures

alpha         ~~ELF 64-bit LSB .* Alpha
amd64         ~~ELF 64-bit LSB .* x86-64, .* (?:GNU/Linux|(?!GNU))
arm           ~~ELF 32-bit LSB .* ARM, version \d,
armeb         ~~ELF 32-bit MSB .* ARM
armel         ~~ELF 32-bit LSB .* ARM, .* \(SYSV\)
armhf         ~~ELF 32-bit LSB .* ARM, .* \(SYSV\)
#avr32         ~~ELF 32-bit MSB .* \(SYSV\)
hppa          ~~ELF 32-bit MSB .* PA-RISC
hppa64        ~~ELF 64-bit MSB .* PA-RISC
hurd-i386     ~~ELF 32-bit LSB .* Intel 80386, .* (?:GNU/Hurd|(?!GNU))
i386          ~~ELF 32-bit LSB .* 80386, .* (?:GNU/Linux|(?!GNU))
ia64          ~~ELF 64-bit LSB .* IA-64
kfreebsd-amd64~~ELF 64-bit LSB .* x86-64, .* (?:GNU/kFreeBSD|(?!GNU))
kfreebsd-i386 ~~ELF 32-bit LSB .* 80386, .* (?:GNU/kFreeBSD|(?!GNU))
lpia          ~~ELF 32-bit LSB .* 80386, .* (?:GNU/Linux|(?!GNU))
m32r          ~~ELF 32-bit MSB .* M32R
m68k          ~~ELF 32-bit MSB .* 680[02]0
mips          ~~ELF 32-bit MSB .* MIPS
mipsel        ~~ELF 32-bit LSB .* MIPS
#mipsn32       ~~ELF 32-bit LSB .* MIPS.* N32
mips64        ~~ELF 64-bit MSB .* MIPS
mipsel64      ~~ELF 64-bit LSB .* MIPS
powerpc       ~~ELF 32-bit MSB .* PowerPC
powerpcspe    ~~ELF 32-bit MSB .* PowerPC .* cisco 4500
ppc64         ~~ELF 64-bit MSB .* PowerPC
s390          ~~ELF 32-bit MSB .* S.390
s390x         ~~ELF 64-bit MSB .* S.390
sh4           ~~ELF 32-bit LSB .* Renesas SH
sparc         ~~ELF 32-bit MSB .* SPARC
#sparcv9b      ~~ELF 32-bit MSB .* SPARC.* V8\+
sparc64       ~~ELF 64-bit MSB .* SPARC
x32           ~~ELF 32-bit LSB .* x86-64