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| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | math/math.h | 8 |
2 files changed, 13 insertions, 1 deletions
@@ -1,3 +1,9 @@ +2017-09-22 Gabriel F. T. Gomes <gabriel@inconstante.eti.br> + + [BZ #22146] + math/math.h: Let fpclassify use the builtin in C++ mode, even + when optimazing for size. + 2017-09-22 Joseph Myers <joseph@codesourcery.com> * csu/Makefile (generated): Do not add version-info.h. diff --git a/math/math.h b/math/math.h index 6c2ad97..c6c289d 100644 --- a/math/math.h +++ b/math/math.h @@ -432,7 +432,13 @@ enum /* Return number of classification appropriate for X. */ # if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__ \ - && !defined __OPTIMIZE_SIZE__ + && (!defined __OPTIMIZE_SIZE__ || defined __cplusplus) + /* The check for __cplusplus allows the use of the builtin, even + when optimization for size is on. This is provided for + libstdc++, only to let its configure test work when it is built + with -Os. No further use of this definition of fpclassify is + expected in C++ mode, since libstdc++ provides its own version + of fpclassify in cmath (which undefines fpclassify). */ # define fpclassify(x) __builtin_fpclassify (FP_NAN, FP_INFINITE, \ FP_NORMAL, FP_SUBNORMAL, FP_ZERO, x) # else |