Bug#948731: /usr/bin/sage shell script

[John Scott]

By the way, looking at the header of that file I see
# workaround #892622; unfortunately we can't simply run setarch -R when 
running Singular
# because src/sage/libs/singular/singular.pyx loads libsingular.so into the 
current process
if [ "$(arch)" = "mips64" -a -z "$SAGE_DEB_MIPS64_WORKAROUND" ]; then
    SAGE_DEB_MIPS64_WORKAROUND=1 exec setarch mips64 -R "$0" "$@"
fi

I don't understand the test inside the brackets. Why do you use -a when there 
is no mention of a file? And if you're checking equality, shouldn't that be a 
double equals sign (==)?

Furthermore, the code refers to mips64, but #892622 refers to mips64el. Is it 
possible these issues are the cause of Sage failing to build from source there 
(#920147)?

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