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Build System: Add support for __atomic built-in operators.

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Add a check to configure.ac for __atomic_fetch_add support.  If found
use the __atomic built-in operators for ast_atomic_dec_and_test and
ast_atomic_fetchadd_int.

ASTERISK~27619

Change-Id: I65b4feb02bae368904ed0fb03f585c05f50a690e
This commit is contained in:
Corey Farrell
2018-01-24 19:49:02 -05:00
parent 7ce34f4e6a
commit 6fbd855228
4 changed files with 55 additions and 7 deletions
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12
configure.ac
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@@ -1070,11 +1070,19 @@ AC_LINK_IFELSE(
# for FreeBSD thr_self
AC_CHECK_HEADERS([sys/thr.h])
AC_MSG_CHECKING(for compiler atomic operations)
AC_MSG_CHECKING(for compiler sync operations)
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([], [int foo1; int foo2 = __sync_fetch_and_add(&foo1, 1);])],
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_GCC_ATOMICS], 1, [Define to 1 if your GCC C compiler provides atomic operations.]),
AC_DEFINE([HAVE_GCC_ATOMICS], 1, [Define to 1 if your GCC C compiler provides __sync atomic operations.]),
AC_MSG_RESULT(no)
)
AC_MSG_CHECKING(for compiler atomic operations)
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([], [int foo1; int foo2 = __atomic_fetch_add(&foo1, 1, __ATOMIC_RELAXED);])],
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_C_ATOMICS], 1, [Define to 1 if your C compiler provides __atomic operations.]),
AC_MSG_RESULT(no)
)