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| author |   Carlos O'Donell <carlos@systemhalted.org> | 2015-10-08 16:34:53 -0400 |
|---|---|---|
| committer | Carlos O'Donell <carlos@systemhalted.org> | 2015-10-08 16:41:45 -0400 |
| commit | 87701a58e291bd7ac3b407d10a829dac52c9c16e (patch) | |
| tree | 885857388aaeb1248850629cc2a2de40dc2472b2 /wcsmbs | |
| parent | Correct "inexact" expectations in lround, llround tests. (diff) | |
| download | glibc-87701a58e291bd7ac3b407d10a829dac52c9c16e.tar.gz glibc-87701a58e291bd7ac3b407d10a829dac52c9c16e.tar.bz2 glibc-87701a58e291bd7ac3b407d10a829dac52c9c16e.zip | |
strcoll: Remove incorrect STRDIFF-based optimization (Bug 18589).
The optimization introduced in commit
f13c2a8dff2329c6692a80176262ceaaf8a6f74e, causes regressions in
sorting for languages that have digraphs that change sort order, like
cs_CZ which sorts ch between h and i.
My analysis shows the fast-forwarding optimization in STRCOLL advances
through a digraph while possibly stopping in the middle which results
in a subsequent skipping of the digraph and incorrect sorting. The
optimization is incorrect as implemented and because of that I'm
removing it for 2.23, and I will also commit this fix for 2.22 where
it was originally introduced.
This patch reverts the optimization, introduces a new bug-strcoll2.c
regression test that tests both cs_CZ.UTF-8 and da_DK.ISO-8859-1 and
ensures they sort one digraph each correctly. The optimization can't be
applied without regressing this test.
Checked on x86_64, bug-strcoll2.c fails without this patch and passes
after. This will also get a fix on 2.22 which has the same bug.
Diffstat (limited to 'wcsmbs')
| -rw-r--r-- | wcsmbs/wcscoll_l.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/wcsmbs/wcscoll_l.c b/wcsmbs/wcscoll_l.c index 6d9384ad64..87f240d281 100644 --- a/wcsmbs/wcscoll_l.c +++ b/wcsmbs/wcscoll_l.c @@ -23,7 +23,6 @@ #define STRING_TYPE wchar_t #define USTRING_TYPE wint_t #define STRCOLL __wcscoll_l -#define STRDIFF __wcsdiff #define STRCMP __wcscmp #define WEIGHT_H "../locale/weightwc.h" #define SUFFIX WC |