一、測(cè)試gcc

1、測(cè)試代碼:c.c

#include <stdio.h>int main(void) {
#ifdef __STDC_VERSION__printf("__STDC_VERSION__ = %ld \n", __STDC_VERSION__);
#endif
#ifdef __STRICT_ANSI__printf("__STRICT_ANSI__ = %d \n", __STRICT_ANSI__);
#endifreturn 0;
}

2、測(cè)試腳本

#!/usr/bin/env bash
for std in c89 c99 c11 c14 c17 gnu89 gnu99 gnu11 gnu14 gnu17; doecho $stdgcc -std=$std -o c.out c.c./c.outecho
done
echo default
gcc -o c.out c.c
./c.out

3、測(cè)試結(jié)果

我的gcc版本：gcc version 4.8.4，測(cè)試結(jié)果如下，其中不加std，即默認(rèn)版本是gun89

c89
__STRICT_ANSI__ = 1 c99
__STDC_VERSION__ = 199901 
__STRICT_ANSI__ = 1 c11
__STDC_VERSION__ = 201112 
__STRICT_ANSI__ = 1 c14
gcc: error: unrecognized command line option ‘-std=c14’
__STDC_VERSION__ = 201112 
__STRICT_ANSI__ = 1 c17
gcc: error: unrecognized command line option ‘-std=c17’
__STDC_VERSION__ = 201112 
__STRICT_ANSI__ = 1 gnu89gnu99
__STDC_VERSION__ = 199901 gnu11
__STDC_VERSION__ = 201112 gun14
gcc: error: unrecognized command line option ‘-std=gun14’
__STDC_VERSION__ = 201112 gnu17
gcc: error: unrecognized command line option ‘-std=gnu17’
__STDC_VERSION__ = 201112 default

二、測(cè)試g++

1、測(cè)試代碼:cpp.cpp

#include <iostream>int main(void) {
#ifdef __cplusplusstd::cout << "__cplusplus = " << __cplusplus << std::endl;
#endif
#ifdef __STRICT_ANSI__std::cout << "__STRICT_ANSI__ = " << __STRICT_ANSI__ << std::endl;
#endifreturn 0;
}

2、測(cè)試腳本

#!/usr/bin/env bash
for std in c++89 c++98 c++11 c++14 c++17 gnu++98 gnu++11 gnu++14 gnu++17; doecho $stdg++ -std=$std -o cpp.out cpp.cpp./cpp.outecho
done
echo default
g++ -o cpp.out cpp.cpp
./cpp.out

3、測(cè)試結(jié)果

我的g++版本：4.8.4，不加-std默認(rèn)版本是c++89

c++89
g++: error: unrecognized command line option ‘-std=c++89’
__cplusplus = 199711c++98
__cplusplus = 199711
__STRICT_ANSI__ = 1c++11
__cplusplus = 201103
__STRICT_ANSI__ = 1c++14
g++: error: unrecognized command line option ‘-std=c++14’
__cplusplus = 201103
__STRICT_ANSI__ = 1c++17
g++: error: unrecognized command line option ‘-std=c++17’
__cplusplus = 201103
__STRICT_ANSI__ = 1gnu++98
__cplusplus = 199711gnu++11
__cplusplus = 201103gnu++14
g++: error: unrecognized command line option ‘-std=gnu++14’
__cplusplus = 201103gnu++17
g++: error: unrecognized command line option ‘-std=gnu++17’
__cplusplus = 201103default
__cplusplus = 199711