From 1e6c93250172946eeb38e94a92a1fd12c9d3011e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 7 Nov 2018 13:22:44 +0100 Subject: Merging upstream version 1.11.0+dfsg. Signed-off-by: Daniel Baumann --- build/m4/ax_c___atomic.m4 | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 build/m4/ax_c___atomic.m4 (limited to 'build/m4/ax_c___atomic.m4') diff --git a/build/m4/ax_c___atomic.m4 b/build/m4/ax_c___atomic.m4 new file mode 100644 index 000000000..dd5ee3d1c --- /dev/null +++ b/build/m4/ax_c___atomic.m4 @@ -0,0 +1,36 @@ +# AC_C___ATOMIC +# ------------- +# Define HAVE_C___ATOMIC if __atomic works. +AN_IDENTIFIER([__atomic], [AC_C___ATOMIC]) +AC_DEFUN([AC_C___ATOMIC], +[AC_CACHE_CHECK([for __atomic], ac_cv_c___atomic, +[AC_LINK_IFELSE( + [AC_LANG_SOURCE( + [[int + main (int argc, char **argv) + { + volatile unsigned long ul1 = 1, ul2 = 0, ul3 = 2; + __atomic_load_n(&ul1, __ATOMIC_SEQ_CST); + __atomic_compare_exchange(&ul1, &ul2, &ul3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&ul1, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_sub(&ul3, 1, __ATOMIC_SEQ_CST); + __atomic_or_fetch(&ul1, ul2, __ATOMIC_SEQ_CST); + __atomic_and_fetch(&ul1, ul2, __ATOMIC_SEQ_CST); + volatile unsigned long long ull1 = 1, ull2 = 0, ull3 = 2; + __atomic_load_n(&ull1, __ATOMIC_SEQ_CST); + __atomic_compare_exchange(&ull1, &ull2, &ull3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&ull1, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_sub(&ull3, 1, __ATOMIC_SEQ_CST); + __atomic_or_fetch(&ull1, ull2, __ATOMIC_SEQ_CST); + __atomic_and_fetch(&ull1, ull2, __ATOMIC_SEQ_CST); + return 0; + } + ]])], + [ac_cv_c___atomic=yes], + [ac_cv_c___atomic=no])]) +if test $ac_cv_c___atomic = yes; then + AC_DEFINE([HAVE_C___ATOMIC], 1, + [Define to 1 if __atomic operations work.]) +fi +])# AC_C___ATOMIC + -- cgit v1.2.3