C++ cstdlib无法使用：：wcstombs解析

我将系统升级到fedora 33，之后发现stdlib.h无法解析某些数据结构：

In file included from /usr/include/c++/10/cstdlib:75,
                 from /usr/include/c++/10/ext/string_conversions.h:41,
                 from /usr/include/c++/10/bits/basic_string.h:6545,
                 from /usr/include/c++/10/string:55,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/include/rocksdb/cache.h:27,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/cache/clock_cache.h:12,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/cache/clock_cache.cc:10:
/usr/include/stdlib.h:935:5: error: expected initializer before ‘__attr_access’
  935 |     __attr_access ((__read_only__, 2));
      |     ^~~~~~~~~~~~~
/usr/include/stdlib.h:940:3: error: expected initializer before ‘__attr_access’
  940 |   __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
      |   ^~~~~~~~~~~~~
/usr/include/stdlib.h:994:30: error: expected initializer before ‘__attr_access’
  994 |      __THROW __nonnull ((2)) __attr_access ((__write_only__, 2, 3));
      |                              ^~~~~~~~~~~~~
In file included from /usr/include/c++/10/ext/string_conversions.h:41,
                 from /usr/include/c++/10/bits/basic_string.h:6545,
                 from /usr/include/c++/10/string:55,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/include/rocksdb/cache.h:27,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/cache/clock_cache.h:12,
                 from /home/ideepika/ceph5/ceph/src/rocksdb/cache/clock_cache.cc:10:
/usr/include/c++/10/cstdlib:154:11: error: ‘mbstowcs’ has not been declared in ‘::’
  154 |   using ::mbstowcs;
      |           ^~~~~~~~
/usr/include/c++/10/cstdlib:171:11: error: ‘wcstombs’ has not been declared in ‘::’
  171 |   using ::wcstombs;
      |           ^~~~~~~~

错误的来源仅仅是因为#include，因此rocksdb的源代码看起来并不可疑

---

调查。。。将使用相关详细信息进行更新，如果需要添加更多详细信息，请告知我。

结果发现cstdlib中添加了最近的补丁：

这可能是不可能的，我现在没有调查相关文件，但是如果其他人碰到这个问题，添加最小更改补丁集

diff --git a/stdlib.h b/stdlib.h
index f255e4a..d88ef89 100644
--- a/stdlib.h
+++ b/stdlib.h
@@ -931,10 +931,11 @@ extern int wctomb (char *__s, wchar_t __wchar) __THROW;
 
 /* Convert a multibyte string to a wide char string.  */
 extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
-                       const char *__restrict __s, size_t __n) __THROW
+                       const char *__restrict __s, size_t __n) __THROW;
 /* Convert a wide char string to multibyte string.  */
 extern size_t wcstombs (char *__restrict __s,
-                       const wchar_t *__restrict __pwcs, size_t __n) __THROW
+                       const wchar_t *__restrict __pwcs, size_t __n)
+     __THROW;
 
 #ifdef __USE_MISC
 /* Determine whether the string value of RESPONSE matches the affirmation
@@ -988,7 +989,7 @@ extern char *ptsname (int __fd) __THROW __wur;
    terminal associated with the master FD is open on in BUF.
    Return 0 on success, otherwise an error number.  */
 extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
-     __THROW __nonnull ((2))
+     __THROW __nonnull ((2));

---

奇怪的在我的F33上没有任何这样的问题<代码>本身就很好。这些错误表明正在构建一些大型软件包。它可能做了一些不完全靠书本的事情，并且被新的编译器绊倒了。闻起来像是“使用命名空间std”。我不确定，但看起来你的libc++与你的libc不兼容。无关：我正在推迟F33升级：-）@TedLyngmo我想Sam可能是对的，与同事核实过，他们没有遇到F33的任何问题…@TedLyngmo谢谢你的麻烦！我解决了这些问题，分号是！！