错误：使用未声明的标识符'ctime_s'

当我尝试使用ctime_s编译cpp代码时，发生了use of undeclared identifier 'ctime_s'。我该如何解决它？错误：使用未声明的标识符'ctime_s'

的main.cpp

#include <iostream> 
#include <time.h> 

int main(int argc, const char * argv[]) { 
    // insert code here... 
    std::cout << "Hello, World!\n"; 
    time_t a; 
    char tt[26]; 
    time(&a); 
    ctime_s(tt,sizeof(tt),&a); 
    printf("%s",tt); 
    return 0; 
}

结果

Machida-no-MacBook-Air:KnowledgeBase machidahiroaki$ gcc main.cpp --verbose 
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn) 
Target: x86_64-apple-darwin14.1.0 
Thread model: posix 
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 242 -v -dwarf-column-info -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.1.0 -stdlib=libc++ -fdeprecated-macro -fdebug-compilation-dir /Users/machidahiroaki/RubymineProjects/KnowledgeBase/KnowledgeBase -ferror-limit 19 -fmessage-length 160 -stack-protector 1 -mstackrealign -fblocks -fobjc-runtime=macosx-10.10.0 -fencode-extended-block-signature -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/c6/p5fy29197r167b46tsw36gb00000gn/T/main-50c81e.o -x c++ main.cpp 
clang -cc1 version 6.1.0 based upon LLVM 3.6.0svn default target x86_64-apple-darwin14.1.0 
ignoring nonexistent directory "/usr/include/c++/v1" 
#include "..." search starts here: 
#include <...> search starts here: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1 
/usr/local/include 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.1.0/include 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include 
/usr/include 
/System/Library/Frameworks (framework directory) 
/Library/Frameworks (framework directory) 
End of search list. 
main.cpp:18:2: error: use of undeclared identifier 'ctime_s' 
     ctime_s(tt,sizeof(tt),&a); 
     ^
1 error generated.

来源

2015-04-17 Hiroaki Machida

['ctime_s']（http://en.cppreference.com/w/c/chrono/ctime）是C11的一部分，但尚未实现无处不在。尝试用'-std = c11'编译;你可能很幸运。 – Wintermute

在C++中没有'ctime_s'，但它只在C中被标准化。 –

在C++ ctime_s尚未实现。
这是一个C函数，它是c11的一部分，这意味着您必须将-std=c11添加到您的编译器标志。

C11 standard (ISO/IEC 9899:2011):

7.27.3.2 The ctime function (p: 393)

K.3.8.2.2 The ctime_s function (p: 626)

而且在你的代码你混合C++使用C。

参考：

A fourth version of the C standard, known as C11, was published in 2011 as ISO/IEC 9899:2011. GCC has substantially complete support for this standard, enabled with -std=c11 or -std=iso9899:2011. (While in development, drafts of this standard version were referred to as C1X.)

来源

2015-04-17 12:54:46 deW1

错误：使用未声明的标识符'ctime_s'

回答

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