问题描述
我将系统升级到 fedora 33，之后我发现 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 /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。
正在调查...将更新相关详细信息，如果需要添加更多详细信息，请告诉我
解决方法
结果是最近添加到 cstdlib 的补丁：https://www.cygwin.com/bugzilla/attachment.cgi?id=12133
这可能没有被发现，我现在没有调查相关文件，但是如果其他人遇到这个问题，我会添加最小的更改补丁集......
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));