On 12/23/2014 04:26 PM, Ola Liljedahl wrote:
On 23 December 2014 at 10:13, Maxim Uvarov <[email protected]> wrote:
Odp atomic operations based on compiler build-ins. Make
sure that compiler supports such operation at configure
stage.
Signed-off-by: Maxim Uvarov <[email protected]>
---
v3: make atomic checks platfrom specific
configure.ac | 4 +++-
platform/linux-generic/m4/configure.m4 | 18 ++++++++++++++++++
2 files changed, 21 insertions(+), 1 deletion(-)
create mode 100644 platform/linux-generic/m4/configure.m4
diff --git a/configure.ac b/configure.ac
index 377e8be..f55beca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,7 +47,9 @@ AC_ARG_WITH([platform],
[AS_HELP_STRING([--with-platform=prefix],
[Select platform to be used, default linux-generic])],
[],
- [with_platform=linux-generic])
+ [with_platform=linux-generic
+ m4_include([./platform/linux-generic/m4/configure.m4])
+ ])
AC_SUBST([with_platform])
diff --git a/platform/linux-generic/m4/configure.m4
b/platform/linux-generic/m4/configure.m4
new file mode 100644
index 0000000..bfb1fb0
--- /dev/null
+++ b/platform/linux-generic/m4/configure.m4
@@ -0,0 +1,18 @@
+AC_MSG_CHECKING(for GCC atomic builtins)
+AC_LINK_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#include <stdint.h>
+ int main() {
+ uint32_t v = 1;
+ __atomic_fetch_add(&v, 1, __ATOMIC_RELAXED);
+ __atomic_fetch_sub(&v, 1, __ATOMIC_RELAXED);
+ __atomic_store_n(&v, 1, __ATOMIC_RELAXED);
+ __atomic_load_n(&v, __ATOMIC_RELAXED);
+ return 0;
+ }
+ ]])],
+ AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no)
+ echo "Atomic operation are not supported by your compiller."
+ echo "Use newer version. For gcc > 4.7.3"
Why >4.7.3? Minor releases do not introduce major new features.
__atomic support was introduced on GCC 4.7.0.
I have ubuntu 12.04 and there is 4.7.3. And it definatelly works there.
So I just set tested value.
I'm ok to change it to 4.7.0.
Maxim.
+ exit -1)
--
1.8.5.1.163.gd7aced9
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