WhyCan Forum(哇酷开发者社区)

遇到同样问题，参考题主及楼上各种方法均失败，分享一下自己查到的方法：https://github.com/openwrt/openwrt/issues/5960
1.修改 host-flex-2.6.4/configure.ac:
@@ -25,8 +25,10 @@
  # autoconf requirements and initialization

  AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
+AC_PREREQ([2.60])
  AC_CONFIG_SRCDIR([src/scan.l])
  AC_CONFIG_AUX_DIR([build-aux])
+AC_USE_SYSTEM_EXTENSIONS
  LT_INIT
  AM_INIT_AUTOMAKE([1.15 -Wno-portability foreign std-options dist-lzip parallel-tests subdir-objects])
  AC_CONFIG_HEADER([src/config.h])

@@ -166,6 +166,7 @@ strtol dnl

   AC_CHECK_FUNCS([dnl
   pow dnl           Used only by "examples/manual/expr"
   setlocale dnl     Needed only if NLS is enabled
+ reallocarr dnl    NetBSD function. Use reallocarray if not available.
   reallocarray dnl  OpenBSD function. We have replacement if not available.
   ])

2.修改 host-flex-2.6.4/src/misc.c:
@@ -142,7 +142,14 @@ void add_action (const char *new_text)

void   *allocate_array (int size, size_t element_size)
{
-    void *mem;
+    void *new_array;
-#if HAVE_REALLOCARRAY
+#if HAVE_REALLOCARR
-
-    /* reallocarray has built-in overflow detection */
-    mem = reallocarray(NULL, (size_t) size, element_size);
+    new_array = NULL;
+    if (reallocarr(&new_array, (size_t) size, element_size))
+        flexfatal (_("memory allocation failed in allocate_array()"));
#else
+# if HAVE_REALLOCARRAY
+    new_array = reallocarray(NULL, (size_t) size, element_size);
+# else
+    /* Do manual overflow detection */
    size_t num_bytes = (size_t) size * element_size;
-    mem = (size && SIZE_MAX / (size_t) size < element_size) ? NULL :
+    new_array = (size && SIZE_MAX / (size_t) size < element_size) ? NULL :
        malloc(num_bytes);
+# endif
+    if (!new_array)
+        flexfatal (_("memory allocation failed in allocate_array()"));
#endif
-    if (!mem)
-        flexfatal (_
-               ("memory allocation failed in allocate_array()"));
-
-    return mem;
+    return new_array;

}

@@ -667,21 +664,21 @@ void   *reallocate_array (void *array, int size, size_t element_size)

void   *reallocate_array (void *array, int size, size_t element_size)
{
    void *new_array;
-#if HAVE_REALLOCARRAY
+#if HAVE_REALLOCARR
+    new_array = array;
+    if (reallocarr(&new_array, (size_t) size, element_size))
+        flexfatal (_("attempt to increase array size failed"));

-    /* reallocarray has built-in overflow detection */
-    new_array = reallocarray(array, (size_t) size, element_size);
#else
+# if HAVE_REALLOCARRAY
+    new_array = reallocarray(array, (size_t) size, element_size);
+# else
+    /* Do manual overflow detection */
    size_t num_bytes = (size_t) size * element_size;
    new_array = (size && SIZE_MAX / (size_t) size < element_size) ? NULL :
        realloc(array, num_bytes);
-#endif
+# endif
    if (!new_array)
        flexfatal (_("attempt to increase array size failed"));
+#endif
    return new_array;
}