Make sure all the GNU builtins for malloc and friends are switched off when...

Make sure all the GNU builtins for malloc and friends are switched off when compiling with tcmalloc and jemalloc.

configure.ac

@@ -660,10 +660,13 @@ if test "x$with_tcmalloc" != "xno"; then
    if test "$have_tcmalloc" = "yes"; then
       TCMALLOC_LIBS="$tclibs"
 
-      # These are recommended for GCC.
-      if test "$ax_cv_c_compiler_vendor" = "gnu"; then
-         CFLAGS="$CFLAGS -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free"
-      fi
+      # Prevent compilers that replace the calls within built-ins (GNU 99) from doing so.
+      case "$ax_cv_c_compiler_vendor" in
+        intel | gnu | clang)
+             CFLAGS="$CFLAGS -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free"
+          ;;
+      esac
+
    else
       TCMALLOC_LIBS=""
    fi
@@ -720,6 +723,14 @@ if test "x$with_jemalloc" != "xno"; then
 
    if test "$have_jemalloc" = "yes"; then
       JEMALLOC_LIBS="$jelibs"
+
+      # Prevent compilers that replace the regular calls within built-ins (GNU 99) from doing so.
+      case "$ax_cv_c_compiler_vendor" in
+        intel | gnu | clang)
+             CFLAGS="$CFLAGS -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free"
+          ;;
+      esac
+
    else
       JEMALLOC_LIBS=""
    fi