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| author | Paul Eggert <eggert@cs.ucla.edu> | 2005-12-13 19:41:57 +0000 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2005-12-13 19:41:57 +0000 |
| commit | eaebfec990d331f44b527fda650dcf68197a5043 (patch) | |
| tree | 50aacf15ea249c8ab869e773b3de564397e1c5c9 /m4/stdbool.m4 | |
| parent | a867264a1805535be9e65cfa9ed1b425bf227904 (diff) | |
| download | coreutils-eaebfec990d331f44b527fda650dcf68197a5043.tar.xz | |
(AC_HEADER_STDBOOL): Check for buggy compiler that
has _Bool but mishandles _Bool |= _Bool.
Diffstat (limited to 'm4/stdbool.m4')
| -rw-r--r-- | m4/stdbool.m4 | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/m4/stdbool.m4 b/m4/stdbool.m4 index 59d38e075..86ae312d4 100644 --- a/m4/stdbool.m4 +++ b/m4/stdbool.m4 @@ -83,11 +83,15 @@ AC_DEFUN([AC_HEADER_STDBOOL], char digs[] = "0123456789"; int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1); #endif + _Bool q = true; + _Bool *pq = &q; ], [ + *pq |= q; + *pq |= ! q; /* Refer to every declared value, to avoid compiler optimizations. */ return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l - + !m + !n + !o + !p); + + !m + !n + !o + !p + !q + !pq); ], [ac_cv_header_stdbool_h=yes], [ac_cv_header_stdbool_h=no])]) |