Mercurial > hg > octave-nkf > gnulib-hg
changeset 1046:973b503772c4
Integrate test to detect bug in memcmp from the
Next x86 OpenStep C library. Test program from William Lewis.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sun, 28 Sep 1997 02:32:26 +0000 |
| parents | 0d97f7ac8128 |
| children | 9a425dbd32d5 |
| files | m4/memcmp.m4 |
| diffstat | 1 files changed, 45 insertions(+), 3 deletions(-) [+] |
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--- a/m4/memcmp.m4 +++ b/m4/memcmp.m4 @@ -1,4 +1,46 @@ -#serial 1 +#serial 2 + +dnl A replacement for autoconf's AC_FUNC_MEMCMP that detects +dnl the losing memcmp on some x86 Next systems. +AC_DEFUN(jm_AC_FUNC_MEMCMP, +[AC_CACHE_CHECK([for working memcmp], jm_cv_func_memcmp_working, +[AC_TRY_RUN( +changequote(<<, >>)dnl +<< +main() +{ + /* Some versions of memcmp are not 8-bit clean. */ + char c0 = 0x40, c1 = 0x80, c2 = 0x81; + if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0) + exit (1); + + /* The Next x86 OpenStep bug shows up only when comparing 16 bytes + or more and with at least one buffer not starting on a 4-byte boundary. + William Lewis provided this test program. */ + { + char foo[21]; + char bar[21]; + int i; + for (i = 0; i < 4; i++) + { + char *a = foo + i; + char *b = bar + i; + strcpy (a, "--------01111111"); + strcpy (b, "--------10000000"); + if (memcmp (a, b, 16) >= 0) + exit (1); + } + exit (0); + } +} +>>, +changequote([, ])dnl + jm_cv_func_memcmp_working=yes, + jm_cv_func_memcmp_working=no, + jm_cv_func_memcmp_working=no)]) +test $jm_cv_func_memcmp_working = no && LIBOBJS="$LIBOBJS memcmp.o" +AC_SUBST(LIBOBJS)dnl +]) dnl If you use this macro in a package, you should dnl add the following two lines to acconfig.h: @@ -6,8 +48,8 @@ dnl #undef memcmp dnl AC_DEFUN(jm_FUNC_MEMCMP, -[AC_REQUIRE([AC_FUNC_MEMCMP])dnl - if test $ac_cv_func_memcmp_clean = no; then +[AC_REQUIRE([jm_AC_FUNC_MEMCMP])dnl + if test $jm_cv_func_memcmp_working = no; then AC_DEFINE_UNQUOTED(memcmp, rpl_memcmp) fi ])