[Bug string/21982] stratcliff.c: error: assuming signed overflow does not occur with -O3

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https://sourceware.org/bugzilla/show_bug.cgi?id=21982

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4e4cfd77617c190a7c8b3f83c41e1ad0771bd569

commit 4e4cfd77617c190a7c8b3f83c41e1ad0771bd569
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Sep 11 08:51:52 2017 -0700

    string/stratcliff.c: Replace int with size_t [BZ #21982]

    Fix GCC 7 errors when string/stratcliff.c is compiled with -O3:

    stratcliff.c: In function ‘do_test’:
    cc1: error: assuming signed overflow does not occur when assuming that (X -
c) <= X is always true [-Werror=strict-overflow]

        [BZ #21982]
        * string/stratcliff.c (do_test): Declare size, nchars, inner,
        middle and outer with size_t instead of int.  Repleace %d and
        %Zd with %zu in printf.  Update "MAX (0, nchars - 128)" and
        "MAX (outer, nchars - 64)" to support unsigned outer and
        nchars.  Also exit loop when outer == 0.

    (cherry picked from commit 376b40a27a6783ea7f73ae577be320df66aeb36d)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog           |    9 ++
 string/stratcliff.c |  276 +++++++++++++++++++++++++++++++--------------------
 2 files changed, 176 insertions(+), 109 deletions(-)

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