diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index a1a561d70e..cde0637d1f 100644 --- a/configure.ac +++ b/configure.ac @@ -1189,6 +1189,32 @@ AC_LINK_IFELSE([AC_LANG_CALL([], [printf\$LDBLStub])], FP_CHECK_PTHREADS +AC_MSG_CHECKING(whether -latomic is needed for sub-word-sized atomic operations) +AC_LINK_IFELSE([AC_LANG_PROGRAM([[unsigned char a;]], [[__atomic_fetch_or(&a, 1, __ATOMIC_RELAXED);]])], + [ + AC_MSG_RESULT(no) + AC_SUBST([CabalNeedLibatomic],[False]) + need_latomic=0 + ], + [ + _save_LIBS=$LIBS + LIBS="-latomic" + AC_LINK_IFELSE([AC_LANG_PROGRAM([[unsigned char a;]], [[__atomic_fetch_or(&a, 1, __ATOMIC_RELAXED);]])], + [ + AC_MSG_RESULT(yes) + AC_SUBST([CabalNeedLibatomic],[True]) + need_latomic=1 + ], + [ + AC_SUBST([CabalNeedLibatomic],[False]) + AC_MSG_ERROR([sub-word-sized atomic operations not available.]) + need_latomic=0 + ]) + LIBS=$_save_LIBS + ]) +AC_DEFINE_UNQUOTED([NEED_ATOMIC_LIB], [$need_latomic], + [Define to 1 if we need -latomic for sub-word atomic operations.]) + dnl ** check for eventfd which is needed by the I/O manager AC_CHECK_HEADERS([sys/eventfd.h]) AC_CHECK_FUNCS([eventfd]) |