bug#22702: [bug-grep] grep-2.23 build feedback

[Nelson H. F. Beebe]

I've just been through a collection of build logs on more than 75
flavors of Unix for grep-2.23, and am pleased to report that all tests
passed on 46 of them.  Most of the others reported only 1 or 2
failures, but because the failures are similar across platforms, I
summarize them here:

FAIL:
        encoding-error
                                x86             MirBSD 10

        fmbtest
                                IA-64           GNU/Linux Red Hat 5.11
                                x86             GNU/Linux CentOS 5.11
                                x86-64          GNU/Linux CentOS 5.11

        invalid-multibyte-infloop
                                x86             MirBSD 10

        multibyte-white-space
                                x86             MirBSD 10
                                x86-64          DragonFlyBSD 4.4, 4.6
                                x86-64          FreeBSD 11
                                x86-64          OpenIndiana 11

        pcre-infloop            x86-64          GNU/Linux Slackware 14

        pcre-invalid-utf8-input
                                x86-64          GNU/Linux Debian 6
                                x86-64          GNU/Linux Slackware 14

        pcre-jitstack
                                PowerPC G4      MacOS X 10.5.8
                                x86             Mac OS X 10.7.5
                                x86             MirBSD 10
                                x86             OpenBSD 4.9, 5.1
                                x86-64          DragonFlyBSD 4.4, 4.6
                                x86-64          KfreeBSD 7.7
                                x86-64          NetBSD 5 and 6
                                x86-64          OpenBSD 5.{4,5,6,7,8}

        surrogate-pair
                                x86-64          OpenBSD 5.8

XFAIL:
        backref-alt
                                IA-64           GNU/Linux Red Hat 5.11
                                x86             GNU/Linux CentOS 5.11
                                x86-64          GNU/Linux CentOS 5.11
                                x86-64          KfreeBSD 7.7

        equiv-classes
                                PowerPC G4      MacOS X 10.5.8
                                x86             Mac OS X 10.7.5
                                x86             MirBSD 10
                                x86             OpenBSD 4.9, 5.1
                                x86-64          DragonFlyBSD 4.4, 4.6
                                x86-64          FreeBSD 11
                                x86-64          GNU/Linux Debian 6
                                x86-64          GNU/Linux Slackware 14
                                x86-64          NetBSD 5 and 6
                                x86-64          OpenBSD 5.{4,5,6,7,8}

        triple-backref
                                IA-64           GNU/Linux Red Hat 5.11
                                PowerPC G4      MacOS X 10.5.8
                                x86             Mac OS X 10.7.5
                                x86             MirBSD 10
                                x86-64          DragonFlyBSD 4.4, 4.6
                                x86-64          GNU/Linux CentOS 5.11
                                x86-64          NetBSD 5 and 6
                                x86-64          OpenBSD 5.{4,5,6,7,8}
                                x86-64          OpenIndiana 11

Some of those failures may be related to deficient multibyte and UTF-8
support on some platforms; I wonder whether there might be a simple
one-line test that could check for such deficiencies and suppress the
rest of the test if so.  It would be nice if the tests could mostly
succeed everywhere, even if that means that some tests are suppressed
because of limited platform support.

In addition, compilation on MacOS X 10.10 (Yosemite) and 10.11 (El
Capitan) produces these warnings from clang masquerading as gcc:

        make[3]: Entering directory '/private/var/tmp/build/bare/grep-2.23/lib'
        Makefile:1684: target '.deps/alloca.Po' given more than once in the 
same rule
          CC       argmatch.o

          CC       error.o
        error.c:386:12: warning: data argument not used by format string 
[-Wformat-extra-args]
                   file_name, line_number);
                   ^
        1 warning generated.

          CC       regex.o
        In file included from regex.c:70:
        ./regex_internal.c:1392:11: warning: comparison of unsigned expression 
< 0 is always false [-Wtautological-compare]
          if (idx < 0 || idx >= set->nelem)
              ~~~ ^ ~
        1 warning generated.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: address@hidden  -
- 155 S 1400 E RM 233                       address@hidden  address@hidden -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
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