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| author | Paul Eggert <eggert@cs.ucla.edu> | 2019-08-24 17:17:39 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2019-08-24 17:18:22 -0700 |
| commit | 77daeef875821f8a00bafc752a5cfc95f3e11e40 (patch) | |
| tree | fb68e149f8fe4289e54cfc66c28c4c71b6ef8c66 /lib | |
| parent | 36b7459cf39ae8ced25a239bcf7c9a275f219f31 (diff) | |
| download | gnulib-77daeef875821f8a00bafc752a5cfc95f3e11e40.tar.gz | |
intprops: say why not Clang __builtin_add_overflow
* lib/intprops.h (_GL_HAS_BUILTIN_OVERFLOW):
Mention Clang in comment, responding to a query from
Mattias Engdegård.
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/intprops.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/intprops.h b/lib/intprops.h index 2c02568834..fbbc3cffe0 100644 --- a/lib/intprops.h +++ b/lib/intprops.h @@ -220,7 +220,9 @@ ? (a) < (min) >> (b) \ : (max) >> (b) < (a)) -/* True if __builtin_add_overflow (A, B, P) works when P is non-null. */ +/* True if __builtin_add_overflow (A, B, P) works when P is non-null. + See <https://bugs.llvm.org/show_bug.cgi?id=16404> for why this is + false for Clang. */ #if 5 <= __GNUC__ && !defined __ICC # define _GL_HAS_BUILTIN_OVERFLOW 1 #else |