ANSI source including epicsMath.h won't compile with newlib 1.15 (RTEMS)

[Till Straumann <strauman@slac.stanford.edu>]

libCom/osi/os/RTEMS/epicsMath.h

declares 'isnan' and 'isinf' as external functions but C99 demands
that they are macros and newlib-1.15 defines them as such.

Including RTEMS' epicsMath.h from a C++ or C99 source file
causes a compilation error.

The attached kludge fixes this.

In fact, using 'isnan/isinf' from code that claims to be ANSI compliant
(EPICS base is usually compiled (gcc) with -ansi) is wrong. ANSI-C code
should not assume these functions to be present.

-- Till
*** src/libCom/osi/os/RTEMS/epicsMath.h.orig	2007-09-18 12:38:39.000000000 -0700
--- src/libCom/osi/os/RTEMS/epicsMath.h	2007-09-18 12:46:28.000000000 -0700
***************
*** 16,24 ****
  extern "C" {
  #endif
  
  int isnan(double);
- int finite(double);
  int isinf(double);
  
  #ifdef __cplusplus
  }
--- 16,29 ----
  extern "C" {
  #endif
  
+ /* T.S.; C99 demands that these are macros and newlib-1.15 defines
+  * them as such!
+  */
+ #if defined(STRICT_ANSI) && !defined(__cplusplus)
  int isnan(double);
  int isinf(double);
+ #endif
+ int finite(double);
  
  #ifdef __cplusplus
  }