mex fortran code containing intrinsic function using Intel fortran compiler
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Edited: Duy Nguyen on 25 Sep 2019
I'm trying to mex a fortran code using the Intel Parallel studio XE 2019 with microsoft visual studio 2015 compiler. My fortran code calls intrinsic functions cosd, sind, and atand. However, the linker keeps complaining that these are unresolved external symbols. Are there libraries that I need to link in during the mex that will define these intrinsic functions? Thanks.
Error using mex
Creating library rcssig.lib and object rcssig.exp
read_reftab.obj : error LNK2019: unresolved external symbol COSD referenced in
body_to_range.obj : error LNK2001: unresolved external symbol COSD
A King on 25 Sep 2019
Edited: A King on 25 Sep 2019
cosd, sind, atand, are NOT part of the Fortran standard, they are GNU extensions to the Fortran language and not understandable by Intel. These GNU functions take the angle in degree instead of radians (which is the deafult Fortran standard for sin, cos, atan). If you want to compile the files by Intel, multiply the arguments of all instances of cosd, sind by pi/180 = 0.01745329251, which converts the angles in degrees to radians, then replace all of the instances of cosd, sind, with cos, sin respectively, which are part of the Fortran standard and that should resolve the error.
As for atand, this function returns angle in degrees, so you will have to replace atand() with 57.2957795131 * atan()
where 57.2957795131 = 180/pi
More Answers (1)
James Tursa on 24 Sep 2019
Edited: James Tursa on 24 Sep 2019
Can you post the offending code? Maybe you are calling it with a non-real argument and the compiler is complaining that it can't find a specific function for your specific argument type.
How are you doing the compiling and linking? With the mex command, or building from within the Visual Studio environment?
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