I’ve tried to execute the code
#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; }
with this command
g++ test.cpp -o test
But I got the error:
/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
The version is:
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.
How can I fix the problem?
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Answer
I see the same behaviour:
~/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
One workaround is to include the header using this pattern instead:
extern "C" { #include "quadmath.h" }
after which:
~/coding/q$ g++ test.cpp -lquadmath ~/coding/q$ ./a.out 1.000000