Changed AC_LANG from PROGRAM to SOURCE to prevent double definition of main

diff --git a/folly/configure.ac b/folly/configure.ac
index bceb1e5856e8fe53318a6eea9119b7c3e37a7c6f..bcfe9c9402e1df4c95fb98a01388f9cf91e7b967 100644 (file)
--- a/folly/configure.ac
+++ b/folly/configure.ac
@@ -235,7 +235,7 @@ AC_CACHE_CHECK(
   [for c++11 atomic support without GNU Atomic library],
   [folly_cv_lib_libatomic],
   [AC_LINK_IFELSE(
-    [AC_LANG_PROGRAM[
+    [AC_LANG_SOURCE[
       #include <atomic>
       int main() {
         struct Test { int val; };