我尝试执行代码
#include <quadmath.h> #include <iostream> int main() { char* y = new char[1000]; quadmath_snprintf(y, 1000, "%Qf", 1.0q); std::cout << y << std::endl; return 0; } 与命令
g++ test.cpp -o test
我得到的错误：
/tmp/cctqto7E.o: In function `main': test.cpp:(.text+0x51): undefined reference to `quadmath_snprintf(char*, unsigned int, char const*, ...)' collect2: ld returned 1 exit status
版本是：
g++ --version g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
我该如何解决这个问题？
我看到相同的行为：
~/coding/q$ g++ test.cpp -lquadmath /tmp/ccYdHwL5.o: In function `main': test.cpp:(.text+0x51): undefined reference to `quadmath_snprintf(char*, unsigned int, char const*, ...)' collect2: ld returned 1 exit status
一种解决方法是使用这种模式来包含头文件：
extern "C" { #include "quadmath.h" }
之后：
~/coding/q$ g++ test.cpp -lquadmath ~/coding/q$ ./a.out 1.000000