openSUSE Forums: Linking quadmath with C++

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Linking quadmath with C++ Dec 8th 2012, 19:32 I have an example code: Code: #include <quadmath.h> int main() {     __float128 foo=123;     cosq(foo);     return 0; } I tried to compile it with the following commands: Code: g++ f128.cpp -lquadmath g++ f128.cpp /usr/lib64/gcc/x86_64-suse-linux/4.6/libquadmath.a g++ f128.cpp /usr/lib64/gcc/x86_64-suse-linux/4.6/libquadmath.a /usr/lib64/libquadmath.so.0 g++ f128.cpp /usr/lib64/gcc/x86_64-suse-linux/4.6/libquadmath.a /usr/lib64/libquadmath.so.0 /usr/lib64/gcc/x86_64-suse-linux/4.6/libquadmath.a All these commands produce one and the same error: Code: f128.cpp:(.text+0x1b): undefined reference to `cosq(__float128)' I also tried to declare cosq as follows, without inluding quadmath.h. Declarations of such style are used in C++ interface to fortran subroutines in other programs, and they work well. Code: extern "C" __float128 cosq_(__float128 *op); extern "C" __float128 cosq_(__float128 op); extern "C" __float128 cosq(__float128 *op); ...and so on... Result was the same. Then I tried to use cosq in Fortran: Code: PROGRAM test           REAL*16 foo           REAL*16 res           foo=1;           res=cos(foo)         PRINT *,res END This program compiles and executes well (prints the answer with lots of digits), so cosq works in it. This program was compiled with no options: gfortran f128.f90. I tried OpenSUSE 12.1 with gcc 4.6.2 and OpenSUSE 12.2 with gcc 4.7.1. *.h, *.a and *.so files mentioned are provided by gcc46-fortran and libquadmath46 packages. All needed include files and libraries exist, linker doesn't print any nonexistance errors. What is the proper way to use cosq and other quadmath functions in C++? I wouldn't like to write Fortran wrappers for them.

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