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| author | Paul Eggert <eggert@cs.ucla.edu> | 2020-09-17 12:17:15 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2020-09-17 12:17:37 -0700 |
| commit | 494aaa530b32b4290df9a31d123bf1825eda7217 (patch) | |
| tree | 0d5d83fa2f71a9032a2501ce0ba1c1597ac310d5 /lib/intprops.h | |
| parent | 8125325281a491de9e0a6edc3c4d40d77c026114 (diff) | |
| download | gnulib-494aaa530b32b4290df9a31d123bf1825eda7217.tar.gz | |
intprops, xalloc: avoid __builtin_mul_overflow_p with Clang
Problem reported by Nelson H. F. Beebe for clang 9.0.1 in:
https://lists.gnu.org/r/grep-devel/2020-09/msg00028.html
* lib/intprops.h (_GL_HAS_BUILTIN_OVERFLOW_P) [__clang__]:
Define to 0.
* lib/xalloc-oversized.h (xalloc_oversized) [__clang__]:
Do not use __builtin_mul_overflow_p.
Diffstat (limited to 'lib/intprops.h')
| -rw-r--r-- | lib/intprops.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/intprops.h b/lib/intprops.h index df66a3877a..cb086715bc 100644 --- a/lib/intprops.h +++ b/lib/intprops.h @@ -244,7 +244,13 @@ /* True if __builtin_add_overflow_p (A, B, C) works, and similarly for __builtin_sub_overflow_p and __builtin_mul_overflow_p. */ -#define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__) +#ifdef __clang__ +/* Clang 9 lacks __builtin_mul_overflow_p, and even if it did it would + presumably run afoul of Clang bug 16404. */ +# define _GL_HAS_BUILTIN_OVERFLOW_P 0 +#else +# define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__) +#endif /* The _GL*_OVERFLOW macros have the same restrictions as the *_RANGE_OVERFLOW macros, except that they do not assume that operands |