1 files changed, 20 insertions, 0 deletions
diff --git a/build/m4/ax_c_mallopt.m4 b/build/m4/ax_c_mallopt.m4
new file mode 100644
index 000000000..31c4fdc36
--- /dev/null
+++ b/build/m4/ax_c_mallopt.m4
@@ -0,0 +1,20 @@
+# AC_C_MALLOPT
+# -------------
+# Define HAVE_C_MALLOPT if mallopt() works.
+AN_IDENTIFIER([mallopt], [AC_C_MALLOPT])
+AC_DEFUN([AC_C_MALLOPT],
+[AC_CACHE_CHECK([for mallopt], ac_cv_c_mallopt,
+[AC_LINK_IFELSE(
+   [AC_LANG_SOURCE(
+      [[#include <malloc.h>
+        int main(int argc, char **argv) {
+          mallopt(M_ARENA_MAX, 1);
+        }
+      ]])],
+   [ac_cv_c_mallopt=yes],
+   [ac_cv_c_mallopt=no])])
+if test $ac_cv_c_mallopt = yes; then
+  AC_DEFINE([HAVE_C_MALLOPT], 1,
+           [Define to 1 if glibc mallopt exists.])
+fi
+])# AC_C_MALLOPT