diff options
| author | Bruno Haible <bruno@clisp.org> | 2006-01-26 13:32:38 +0000 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2006-01-26 13:32:38 +0000 |
| commit | b179e18c5758fcd6ed1dadb4f8a2526f876459a8 (patch) | |
| tree | 6cc99e0df4cc064f316a64336fba14c93a96d47e /m4/stdbool.m4 | |
| parent | 0275c71010d3b2ac4cfee8c8600882e46d545397 (diff) | |
| download | gnulib-b179e18c5758fcd6ed1dadb4f8a2526f876459a8.tar.gz | |
Fixes from Paul Eggert.
Diffstat (limited to 'm4/stdbool.m4')
| -rw-r--r-- | m4/stdbool.m4 | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/m4/stdbool.m4 b/m4/stdbool.m4 index f37f27b973..43fbe28154 100644 --- a/m4/stdbool.m4 +++ b/m4/stdbool.m4 @@ -74,7 +74,7 @@ AC_DEFUN([AC_HEADER_STDBOOL], _Bool n[m]; char o[sizeof n == m * sizeof n[0] ? 1 : -1]; char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; - #if defined __xlc__ + #if defined __xlc__ || defined __GNUC__ /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0 reported by James Lemley on 2005-10-05; see http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html @@ -86,7 +86,10 @@ AC_DEFUN([AC_HEADER_STDBOOL], Let us hope that IBM fixes the xlc bug, and also adds support for this kind of constant expression. In the meantime, this test will reject xlc, which is OK, since - our stdbool.h substitute should suffice. */ + our stdbool.h substitute should suffice. We also test + this with GCC, where it should work, to detect more + quickly whether someone messes up the test in the + future. */ char digs[] = "0123456789"; int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1); #endif @@ -98,9 +101,11 @@ AC_DEFUN([AC_HEADER_STDBOOL], _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])]) |