diff options
| -rw-r--r-- | configure.in | 1 | ||||
| -rw-r--r-- | sql/mysql_priv.h | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/configure.in b/configure.in index b524dcee702..187d65684ea 100644 --- a/configure.in +++ b/configure.in @@ -852,6 +852,7 @@ AC_CHECK_HEADERS([xfs/xfs.h]) #-------------------------------------------------------------------- AC_CHECK_LIB(m, floor, [], AC_CHECK_LIB(m, __infinity)) +AC_CHECK_FUNCS(log2) AC_CHECK_LIB(nsl_r, gethostbyname_r, [], AC_CHECK_LIB(nsl, gethostbyname_r)) diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h index d62ffd6adca..024d20472c3 100644 --- a/sql/mysql_priv.h +++ b/sql/mysql_priv.h @@ -2567,6 +2567,19 @@ inline bool is_user_table(TABLE * table) return strncmp(name, tmp_file_prefix, tmp_file_prefix_length); } + +#ifndef HAVE_LOG2 +/* + This will be slightly slower and perhaps a tiny bit less accurate than + doing it the IEEE754 way but log2() should be available on C99 systems. +*/ +inline double log2(double x) +{ + return (log(x) / M_LN2); +} +#endif + + /* Some functions that are different in the embedded library and the normal server |