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Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index d69ff312b8..67c645a3d0 100644 --- a/configure.ac +++ b/configure.ac @@ -1211,6 +1211,27 @@ AC_CHECK_FUNC(pthread_create, AC_DEFINE_UNQUOTED([NEED_PTHREAD_LIB], [$need_lpthread], [Define 1 if we need to link code using pthreads with -lpthread]) +AC_MSG_CHECKING(whether -latomic is needed for sub-word-sized atomic operations) +AC_CHECK_FUNC(atomic_fetch_or, + [ + AC_MSG_RESULT(no) + AC_SUBST([CabalNeedAtomic],[False]) + need_latomic=0 + ], + [ + AC_CHECK_LIB(atomic, atomic_fetch_or, + [ + AC_MSG_RESULT(yes) + AC_SUBST([CabalNeedAtomic],[True]) + need_latomic=1 + ], + [ + AC_SUBST([CabalNeedAtomic],[False]) + AC_MSG_ERROR([sub-word-sized atomic operations not available.]) + need_latomic=0 + ]) + ]) + dnl ** pthread_setname_np is a recent addition to glibc, and OS X has dnl a different single-argument version. AC_CHECK_LIB(pthread, pthread_setname_np) |