+++ /dev/null
-From df087711cf7be55268a55e7820f4d928cb34c078 Mon Sep 17 00:00:00 2001
-From: "Yann E. MORIN" <yann.morin.1998@free.fr>
-Date: Sat, 9 Jul 2016 20:44:36 +0200
-Subject: [PATCH] m4: fix detection of atomics
-
-In cross-compilation, it is impossible to run code at configure time to
-detect the target specifics.
-
-As such, AC_TRY_RUN fails miserably to detect reliably that atomic
-intrisics are present in a toolchain, and decides they are not just
-because this is cross-compilation.
-
-Instead of AC_TRY_RUN, use AC_LINK_IFELSE that does not need to actually
-run code, since all we're interested in is whether the intrisics are
-present (or not). Fix both the 32- and 64-bit variants, even if the
-latter is not used currently.
-
-Fixes build failures detected by the Buildroot autobuilders, like:
- http://autobuild.buildroot.org/results/23a/23ac0e742ed3a70ae4d038f8c9eadc23e708f671/build-end.log
- http://autobuild.buildroot.org/results/192/1923d0b570adba494f83747a9610ea6ec35f5223/build-end.log
-
-and many other cases, espcially on architectures where such intrisics are
-present, but where the toolchain does not have threads (and anyway, it
-is much more efficient to use the intrisics rather than use mutexes).
-
-Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
----
-Patch sent upstream:
- https://github.com/rsyslog/libfastjson/pull/109
-
----
- m4/atomic_operations.m4 | 6 ++----
- m4/atomic_operations_64bit.m4 | 6 ++----
- 2 files changed, 4 insertions(+), 8 deletions(-)
-
-diff --git a/m4/atomic_operations.m4 b/m4/atomic_operations.m4
-index ad0ee60..7d2bca6 100644
---- a/m4/atomic_operations.m4
-+++ b/m4/atomic_operations.m4
-@@ -9,9 +9,7 @@
- #
- AC_DEFUN([RS_ATOMIC_OPERATIONS],
- [AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins],
--[AC_TRY_RUN([
--int main()
--{
-+[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[
- unsigned long val = 1010, tmp, *mem = &val;
-
- if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020)
-@@ -44,7 +42,7 @@ int main()
- return 1;
-
- return 0;
--}], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], [ap_cv_atomic_builtins=no])])
-+]])], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no])])
-
- if test "$ap_cv_atomic_builtins" = "yes"; then
- AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins])
-diff --git a/m4/atomic_operations_64bit.m4 b/m4/atomic_operations_64bit.m4
-index 9fbef0a..d01a977 100644
---- a/m4/atomic_operations_64bit.m4
-+++ b/m4/atomic_operations_64bit.m4
-@@ -9,9 +9,7 @@
- #
- AC_DEFUN([RS_ATOMIC_OPERATIONS_64BIT],
- [AC_CACHE_CHECK([whether the compiler provides atomic builtins for 64 bit data types], [ap_cv_atomic_builtins_64],
--[AC_TRY_RUN([
--int main()
--{
-+[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[
- unsigned long long val = 1010, tmp, *mem = &val;
-
- if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020)
-@@ -44,7 +42,7 @@ int main()
- return 1;
-
- return 0;
--}], [ap_cv_atomic_builtins_64=yes], [ap_cv_atomic_builtins_64=no], [ap_cv_atomic_builtins_64=no])])
-+]])], [ap_cv_atomic_builtins_64=yes], [ap_cv_atomic_builtins_64=no])])
-
- if test "$ap_cv_atomic_builtins_64" = "yes"; then
- AC_DEFINE(HAVE_ATOMIC_BUILTINS64, 1, [Define if compiler provides 64 bit atomic builtins])
---
-2.7.4
-