[Bug gold/21545] New: relro_test.sh can be simplified, eliminating dependency on dc

[sourceware at jonathancottrill dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=21545

            Bug ID: 21545
           Summary: relro_test.sh can be simplified, eliminating
                    dependency on dc
           Product: binutils
           Version: 2.27
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: sourceware at jonathancottrill dot net
                CC: ian at airs dot com
  Target Milestone: ---

Created attachment 10082
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10082&action=edit
[PATCH] Simplify gold relro_test; eliminate dc dependency

gold/testsuite/relro_test.sh does some unnecessarily complicated manipulation
of hex values, along with some arithmetic using dc. dc doesn't necessarily
exist on all systems trying to build and check binutils, and isn't needed
because the shell script can do the hex arithmetic, itself, using the $(())
construct.

For example:

RELRO_END=$((RELRO_START + RELRO_LEN))

...works fine with hex values prefixed with 0x stored in RELRO_START and
RELRO_LEN.

The end result is simpler and easier to follow. (I also simplified a couple of
grep/awk commands.) Please see the attached patch (against current master).

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