more cleanup

[m6w6/libmemcached] / CMake / CheckAtomics.cmake

diff --git a/CMake/CheckAtomics.cmake b/CMake/CheckAtomics.cmake
index e09c8fd3287b412f890b9f00e068f41526a78cef..73060fee0175f29eaf83e830b543dd0a17b42775 100644 (file)
--- a/CMake/CheckAtomics.cmake
+++ b/CMake/CheckAtomics.cmake
@@ -1,58 +1,65 @@
-include(CheckCSourceRuns)
-include(CheckCXXSourceRuns)
-
 # sets HAVE_ATOMICS, checks for :
 # - C++11 std::atomic:  HAVE_CXX_STDATOMIC
 # - C11 stdatomic:      HAVE_C_STDATOMIC
 # - builtin __atomic:   HAVE_BUILTIN_ATOMIC
 # - builtin __sync:     HAVE_BUILTIN_SYNC
 # - atomic_add_nv:      HAVE_ATOMIC_ADD_NV
-function(check_atomics)
-    check_cxx_source_runs("
-            #include <atomic>
-            int main() {
-                std::atomic<int> i(0);
-                return atomic_load(&i);
-            }"
-            HAVE_CXX_STDATOMIC)
-    check_c_source_runs("
-            #include <stdatomic.h>
-            int main() {
-                atomic_int i;
-                atomic_init(&i, 0);
-                return atomic_load(&i);
-            }"
-            HAVE_C_STDATOMIC)
-    foreach(BUILTIN_ATOMIC_PREFIX IN ITEMS _ __c11)
-        check_c_source_runs("
-                int main() {
-                    long l = -1;
-                    return ${BUILTIN_ATOMIC_PREFIX}_atomic_add_fetch(&l,1,__ATOMIC_RELAXED);
-                }"
-                HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
-        if (HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
-            set(HAVE_BUILTIN_ATOMIC 1)
-            break()
-        endif()
-    endforeach()
-    check_c_source_runs("
+
+configure_define(HAVE_ATOMICS)
+
+check_cxx_source("
+        #include <atomic>
+        int main() {
+            std::atomic<int> i(0);
+            return atomic_load(&i);
+        }"
+        HAVE_CXX_STDATOMIC)
+
+check_c_source("
+        #include <stdatomic.h>
+        int main() {
+            atomic_int i;
+            atomic_init(&i, 0);
+            return atomic_load(&i);
+        }"
+        HAVE_C_STDATOMIC)
+
+
+configure_define(HAVE_BUILTIN_ATOMIC)
+configure_define_literal(BUILTIN_ATOMIC_PREFIX)
+foreach(BUILTIN_ATOMIC_PREFIX IN ITEMS __c11 _ "")
+    check_c_source("
             int main() {
                 long l = -1;
-                return __sync_add_and_fetch(&l,1);
-            }"
-            HAVE_BUILTIN_SYNC)
-    check_c_source_runs("
-            #include <atomic.h>
-            int main() {
-                volatile uint_t i = 0;
-                return atomic_add_int_nv(&i, 1) == 1 ? 0 : -1;
+                return ${BUILTIN_ATOMIC_PREFIX}_atomic_add_fetch(&l,1,__ATOMIC_RELAXED);
             }"
-            HAVE_ATOMIC_ADD_NV)
-    if (        HAVE_CXX_STDATOMIC
-            OR  HAVE_C_STDATOMIC
-            OR  HAVE_BUILTIN_ATOMIC
-            OR  HAVE_BUILTIN_SYNC
-            OR  HAVE_ATOMIC_ADD_NV)
-        set(HAVE_ATOMICS 1 PARENT_SCOPE)
+            HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
+    if (HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
+        set(HAVE_BUILTIN_ATOMIC 1)
+        break()
     endif()
-endfunction()
+endforeach()
+
+check_c_source("
+        int main() {
+            long l = -1;
+            return __sync_add_and_fetch(&l,1);
+        }"
+        HAVE_BUILTIN_SYNC)
+
+check_c_source("
+        #include <atomic.h>
+        int main() {
+            volatile uint_t i = 0;
+            return atomic_add_int_nv(&i, 1) == 1 ? 0 : -1;
+        }"
+        HAVE_ATOMIC_ADD_NV)
+
+
+if (        (HAVE_CXX_STDATOMIC)
+        OR  (HAVE_C_STDATOMIC)
+        OR  (HAVE_BUILTIN_ATOMIC)
+        OR  (HAVE_BUILTIN_SYNC)
+        OR  (HAVE_ATOMIC_ADD_NV))
+    set(HAVE_ATOMICS 1 CACHE INTERNAL "HAVE_ATOMICS")
+endif()