Merge pull request #9106 from omoerbeek/release-cycles

[thirdparty/pdns.git] / m4 / pdns_check_os.m4

diff --git a/m4/pdns_check_os.m4 b/m4/pdns_check_os.m4
index 860f9aa0e35029fc897694041e36ab55f4decc57..da4bc8fd111b7b88ddd37ee76fadd8400e674304 100644 (file)
--- a/m4/pdns_check_os.m4
+++ b/m4/pdns_check_os.m4
@@ -35,16 +35,21 @@ AC_DEFUN([PDNS_CHECK_OS],[
   AM_CONDITIONAL([HAVE_LINUX], [test "x$have_linux" = "xyes"])
   AM_CONDITIONAL([HAVE_SOLARIS], [test "x$have_solaris" = "xyes"])
 
-  case "$host" in
-  mips* | powerpc-* )
-    AC_MSG_CHECKING([whether the linker accepts -latomic])
-    LDFLAGS="-latomic $LDFLAGS"
-    AC_LINK_IFELSE([m4_default([],[AC_LANG_PROGRAM()])],
-      [AC_MSG_RESULT([yes])],
-      [AC_MSG_ERROR([Unable to link against libatomic, cannot continue])]
-    )
-    ;;
-  esac
+  AC_MSG_CHECKING([whether -latomic is needed for __atomic builtins])
+  AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM([[#include <stdint.h>]],
+       [[uint64_t val = 0; __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);]]
+    )],
+    [AC_MSG_RESULT([no])],
+    [LIBS="$LIBS -latomic"
+     AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM([[#include <stdint.h>]],
+               [[uint64_t val = 0; __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);]]
+       )],
+       [AC_MSG_RESULT([yes])],
+       [AC_MSG_FAILURE([libatomic needed, but linking with -latomic failed, cannot continue])]
+    )]
+  )
 
   AC_SUBST(THREADFLAGS)
   AC_SUBST([DYNLINKFLAGS], [-export-dynamic])