don't try to run the poly tests on gcc-4.9. they will fail.

[folly.git] / folly / configure.ac

diff --git a/folly/configure.ac b/folly/configure.ac
index 181f46872edf1a785d52357769d1a68f96f7b7ca..826972e2c123d689bc684c14afcd79ea0e6dd731 100644 (file)
--- a/folly/configure.ac
+++ b/folly/configure.ac
@@ -525,6 +525,22 @@ AC_DEFINE_UNQUOTED(
   [Define to 1 if the compiler has VLA (variable-length array) support,
    otherwise define to 0])
 
+AC_CACHE_CHECK(
+  [for variable template support],
+  [folly_cv_prog_cc_have_variable_templates],
+  [AC_COMPILE_IFELSE(
+    [AC_LANG_SOURCE[
+      template <class> constexpr bool g = true;
+      int main() {}
+    ]],
+    [folly_cv_prog_cc_have_variable_templates=yes],
+    [folly_cv_prog_cc_have_variable_templates=no])])
+
+AM_CONDITIONAL(
+  [HAVE_VARIABLE_TEMPLATES],
+  [test "x${folly_cv_prog_cc_have_variable_templates}" = "xyes"],
+  [Define to 1 if the compiler supports variable templates])
+
 # Checks for library functions.
 AC_CHECK_FUNCS([malloc_size \
                 malloc_usable_size \