Make support for thread-unsafe C functions optional. One of the aspects of CloudABI is that it aims to help you write code that is thread-safe out of the box. This is very important if you want to write libraries that are easy to reuse. For CloudABI we decided to not provide the thread-unsafe functions. So far this is working out pretty well, as thread-unsafety issues are detected really early on. The following patch adds a knob to libc++, _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS, that can be set to disable thread-unsafe functions that can easily be avoided in practice. The following functions are not thread-safe: - <clocale>: locale handles should be preferred over setlocale(). - <cstdlib>: mbrlen(), mbrtowc() and wcrtomb() should be preferred over their non-restartable counterparts. - <ctime>: asctime(), ctime(), gmtime() and localtime() are not thread-safe. The first two are also deprecated by POSIX. Differential Revision:http://reviews.llvm.org/D8703 Reviewed by: marshall git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@240527 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/cstring b/include/cstring index 21c9155..d60b992 100644 --- a/include/cstring +++ b/include/cstring
@@ -102,7 +102,9 @@ inline _LIBCPP_INLINE_VISIBILITY char* strstr( char* __s1, const char* __s2) {return ::strstr(__s1, __s2);} #endif +#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS using ::strtok; +#endif using ::memset; using ::strerror; using ::strlen; 