Mercurial > hg > octave-kai > gnulib-hg
changeset 14760:fd6c5b527040
intprops: work around C compiler bugs
* lib/intprops.h (INT_MULTIPLY_RANGE_OVERFLOW): Work around compiler
bug in Sun C 5.11 2010/08/13 and other compilers; see
<http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Thu, 19 May 2011 01:36:25 -0700 |
parents | 0f9cae3e684f |
children | 6c5502aeb486 |
files | ChangeLog lib/intprops.h |
diffstat | 2 files changed, 16 insertions(+), 6 deletions(-) [+] |
line wrap: on
line diff
--- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,10 @@ 2011-05-19 Paul Eggert <eggert@cs.ucla.edu> + intprops: work around C compiler bugs + * lib/intprops.h (INT_MULTIPLY_RANGE_OVERFLOW): Work around compiler + bug in Sun C 5.11 2010/08/13 and other compilers; see + <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>. + intprops: TYPE_IS_INTEGER, TYPE_SIGNED not integer constant exprs * doc/intprops.texi (Integer Type Determination): Fix documentation for TYPE_IS_INTEGER: it returns an constant
--- a/lib/intprops.h +++ b/lib/intprops.h @@ -179,16 +179,21 @@ : 0 < (a)) /* Return 1 if A * B would overflow in [MIN,MAX] arithmetic. - See above for restrictions. */ + See above for restrictions. Avoid && and || as they tickle + bugs in Sun C 5.11 2010/08/13 and other compilers; see + <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>. */ #define INT_MULTIPLY_RANGE_OVERFLOW(a, b, min, max) \ ((b) < 0 \ ? ((a) < 0 \ ? (a) < (max) / (b) \ - : (b) < -1 && (min) / (b) < (a)) \ - : (0 < (b) \ - && ((a) < 0 \ - ? (a) < (min) / (b) \ - : (max) / (b) < (a)))) + : (b) == -1 \ + ? 0 \ + : (min) / (b) < (a)) \ + : (b) == 0 \ + ? 0 \ + : ((a) < 0 \ + ? (a) < (min) / (b) \ + : (max) / (b) < (a))) /* Return 1 if A / B would overflow in [MIN,MAX] arithmetic. See above for restrictions. Do not check for division by zero. */