Math Library Changes

In Oracle Solaris Studio 12.4 and earlier releases of the compilers, the <sunmath.h> header file included C/C++ prototypes for "wrapper" functions intended to be called from Fortran to invoke many of the nonstandard math functions and floating-point utility routines in libsunmath. These "wrapper" functions themselves simply call corresponding functions that can be called from C/C++ directly, so there is no need for a C/C++ program to use them. For example, the "wrapper" function r_atan2d_ is equivalent to the C function atan2df.

In Oracle Developer Studio 12.5 , the "wrapper" functions are deprecated. Their prototypes in <sunmath.h> are now guarded by the preprocessor macro __SUNMATH_DEPRECATED; using these functions in a C program produces a warning:

example% cat func.c
    #include <sunmath.h> 
    float func(float x, float y) {  
        return r_atan2d_(&x, &y); 
    }
    example% cc -c func.c 
    "func.c", line 4: warning: implicit function declaration:
    r_atan2d_ 
    example% 

The resulting program will likely produce incorrect results. Such a program should be rewritten to use the corresponding C function directly:

return atan2df(x, y);

Alternatively, you can add#define __SUNMATH_DEPRECATED prior to the inclusion of <sunmath.h> or add -D__SUNMATH_DEPRECATED to the compiler flags specified on the command line, but note that the "wrapper" functions might be removed altogether in a future release.