Have cmake and configure look for round() functions.

[zturner]

Summary

VS2012 does not support this set of C99 math functions but VS2013 does, so we need to be able to check for it at compile time.

[dblaikie]

Looks like you forgot to add llvm-commits to the review.

[zturner]

This isn't going to achieve the intended purpose for other reasons, so I'm going to close it out.

cmake/config-ix.cmake

 check_symbol_exists(floorf math.h HAVE_FLOORF)
 check_symbol_exists(fmodf math.h HAVE_FMODF)
 check_symbol_exists(log math.h HAVE_LOG)
 check_symbol_exists(log2 math.h HAVE_LOG2)
 check_symbol_exists(log10 math.h HAVE_LOG10)
 check_symbol_exists(exp math.h HAVE_EXP)
 check_symbol_exists(exp2 math.h HAVE_EXP2)
 check_symbol_exists(exp10 math.h HAVE_EXP10)
+check_symbol_exists(round math.h HAVE_ROUND)
+check_symbol_exists(roundf math.h HAVE_ROUNDF)
+check_symbol_exists(roundl math.h HAVE_ROUNDL)
 check_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
 check_symbol_exists(futimes sys/time.h HAVE_FUTIMES)
 if( HAVE_SETJMP_H )
   check_symbol_exists(longjmp setjmp.h HAVE_LONGJMP)
   check_symbol_exists(setjmp setjmp.h HAVE_SETJMP)
   check_symbol_exists(siglongjmp setjmp.h HAVE_SIGLONGJMP)
   check_symbol_exists(sigsetjmp setjmp.h HAVE_SIGSETJMP)
 endif()

include/llvm/Config/config.h.cmake

 #cmakedefine HAVE_FFI_H ${HAVE_FFI_H}
 
 /* Set to 1 if the finite function is found in <ieeefp.h> */
 #cmakedefine HAVE_FINITE_IN_IEEEFP_H ${HAVE_FINITE_IN_IEEEFP_H}
 
 /* Define to 1 if you have the `floorf' function. */
 #cmakedefine HAVE_FLOORF ${HAVE_FLOORF}
 
+/* Define to 1 if you have the `round' function. */
+#cmakedefine HAVE_ROUND ${HAVE_ROUND}
+
+/* Define to 1 if you have the `roundf' function. */
+#cmakedefine HAVE_ROUNDF ${HAVE_ROUNDF}
+
+/* Define to 1 if you have the `roundl' function. */
+#cmakedefine HAVE_ROUNDL ${HAVE_ROUNDL}
+
 /* Define to 1 if you have the `log' function. */
 #cmakedefine HAVE_LOG ${HAVE_LOG}
 
 /* Define to 1 if you have the `log2' function. */
 #cmakedefine HAVE_LOG2 ${HAVE_LOG2}
 
 /* Define to 1 if you have the `log10' function. */
 #cmakedefine HAVE_LOG10 ${HAVE_LOG10}

include/llvm/Config/config.h.in

 #undef HAVE_FFI_H
 
 /* Set to 1 if the finite function is found in <ieeefp.h> */
 #undef HAVE_FINITE_IN_IEEEFP_H
 
 /* Define to 1 if you have the `floorf' function. */
 #undef HAVE_FLOORF
 
+/* Define to 1 if you have the `round' function. */
+#undef HAVE_ROUND
+
+/* Define to 1 if you have the `roundf' function. */
+#undef HAVE_ROUNDF
+
+/* Define to 1 if you have the `roundl' function. */
+#undef HAVE_ROUNDL
+
 /* Define to 1 if you have the `fmodf' function. */
 #undef HAVE_FMODF
 
 /* Define to 1 if you have the `futimens' function. */
 #undef HAVE_FUTIMENS
 
 /* Define to 1 if you have the `futimes' function. */
 #undef HAVE_FUTIMES