#include <stdlib.h>
#include <stdio.h>
#ifdef _WIN32
#include <process.h>
#else
#include <unistd.h>
extern char ** environ;
#endif
#include <fcgio.h>
#include <fcgi_config.h>  // HAVE_IOSTREAM_WITHASSIGN_STREAMBUF
#include <fcgi_stdio.h>  int main(void)
{  int count = 0;  while(FCGI_Accept() >= 0) {  printf("Content-type: text/html\r\n");  printf("\r\n");  printf("Hello world!<br>\r\n");  printf("Request number %d.", count++);  }  return 0; }

测试：http://127.0.0.1/lovely.fcgi

输出：Hello world!
Request number 0.

刷新：

Hello world!
Request number 1.

遇到问题：

1、undefined reference to FCGI_printf

2、undefined reference to `std::ios_base::Init::Init()

错误原因分析：参见笔记其他文章。

root@mypc % cc -o lovely.fcgi fcgi.cpp -I /usr/local/include -L /usr/local/lib/
/var/tmp//ccmFcKvo.o: In function `std::__verify_grouping(char const*, unsigned int, std::string const&)':
fcgi.cpp:(.text+0x1e): undefined reference to `std::string::size() const'
fcgi.cpp:(.text+0x69): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xa7): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xef): undefined reference to `std::string::operator[](unsigned int) const'
/var/tmp//ccmFcKvo.o: In function `__static_initialization_and_destruction_0(int, int)':
fcgi.cpp:(.text+0x13d): undefined reference to `std::ios_base::Init::Init()'
/var/tmp//ccmFcKvo.o: In function `__tcf_0':
fcgi.cpp:(.text+0x18e): undefined reference to `std::ios_base::Init::~Init()'
/var/tmp//ccmFcKvo.o: In function `main':
fcgi.cpp:(.text+0x1c2): undefined reference to `FCGI_printf'
fcgi.cpp:(.text+0x1ce): undefined reference to `FCGI_printf'
fcgi.cpp:(.text+0x1da): undefined reference to `FCGI_printf'
fcgi.cpp:(.text+0x1f1): undefined reference to `FCGI_printf'
fcgi.cpp:(.text+0x1f6): undefined reference to `FCGI_Accept'
/var/tmp//ccmFcKvo.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
root@mypc % cc -I /usr/local/include -L /usr/local/lib/ -lfcgi fcgi.cpp 
/var/tmp//ccfGPFwl.o: In function `std::__verify_grouping(char const*, unsigned int, std::string const&)':
fcgi.cpp:(.text+0x1e): undefined reference to `std::string::size() const'
fcgi.cpp:(.text+0x69): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xa7): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xef): undefined reference to `std::string::operator[](unsigned int) const'
/var/tmp//ccfGPFwl.o: In function `__static_initialization_and_destruction_0(int, int)':
fcgi.cpp:(.text+0x13d): undefined reference to `std::ios_base::Init::Init()'
/var/tmp//ccfGPFwl.o: In function `__tcf_0':
fcgi.cpp:(.text+0x18e): undefined reference to `std::ios_base::Init::~Init()'
/var/tmp//ccfGPFwl.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'

root@mypc % gcc -I /usr/local/include -L /usr/local/lib/ -lfcgi fcgi.cpp
/var/tmp//cc0Anyuk.o: In function `std::__verify_grouping(char const*, unsigned int, std::string const&)':
fcgi.cpp:(.text+0x1e): undefined reference to `std::string::size() const'
fcgi.cpp:(.text+0x69): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xa7): undefined reference to `std::string::operator[](unsigned int) const'
fcgi.cpp:(.text+0xef): undefined reference to `std::string::operator[](unsigned int) const'
/var/tmp//cc0Anyuk.o: In function `__static_initialization_and_destruction_0(int, int)':
fcgi.cpp:(.text+0x13d): undefined reference to `std::ios_base::Init::Init()'
/var/tmp//cc0Anyuk.o: In function `__tcf_0':
fcgi.cpp:(.text+0x18e): undefined reference to `std::ios_base::Init::~Init()'
/var/tmp//cc0Anyuk.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'

正确命令为：gcc -I /usr/local/include -L /usr/local/lib/ -lfcgi -lstdc++ -o lovely.fcgi fcgi.cpp