Check for fenv.h availability. Apparently, MS visual doesn't have C99 support before 2013, so previous commit didn't compile on MSVISUAL.

If fenv.h not available, program now error exits if fenv functions are requested.

SConstruct

@@ -770,6 +770,12 @@ def get_expression_value(includes, expression):
 
 env['HAS_TIMES_H'] = conf.CheckCHeader('sys/times.h', '""')
 env['HAS_UNISTD_H'] = conf.CheckCHeader('unistd.h', '""')
+#
+# Check to see if the compiler supports C99 fenv.h
+#      Apparently, the only compiler not to is MS visual before 2013
+#
+env['HAS_FENV_H'] = conf.CheckCHeader('fenv.h', '""')
+
 env['HAS_MATH_H_ERF'] = conf.CheckDeclaration('erf', '#include <math.h>', 'C++')
 
 env['HAS_GLOBAL_ISNAN'] = conf.CheckStatement('::isnan(1.0)', '#include <cmath>')
@@ -1210,6 +1216,12 @@ cdefine('USE_GLOBAL_ISNAN', 'HAS_GLOBAL_ISNAN')
 cdefine('USE_STD_ISNAN', 'HAS_STD_ISNAN')
 cdefine('USE_UNDERSCORE_ISNAN', 'HAS_UNDERSCORE_ISNAN')
 
+#  this turns on HAS_FENV_H
+if env['HAS_FENV_H']:
+    configh['HAS_FENV_H'] = 1
+else:
+    configh['HAS_FENV_H'] = None
+
 config_h = env.Command('include/cantera/base/config.h',
                        'include/cantera/base/config.h.in',
                        ConfigBuilder(configh))

include/cantera/base/config.h.in

@@ -76,6 +76,8 @@ typedef  int          ftnlen;       // Fortran hidden string length type
 %(USE_GLOBAL_ISNAN)s
 %(USE_UNDERSCORE_ISNAN)s
 
+%(HAS_FENV_H)s
+
 // This define is needed to account for the variability for how
 // static variables in templated classes are defined. Right now
 // this is only turned on for the SunPro compiler on Solaris.

src/base/ctexceptions.cpp

@@ -5,7 +5,9 @@
 #include "cantera/base/global.h"
 #include "cantera/base/stringUtils.h"
 
+#ifdef HAVE_FENVH
 #include <fenv.h>
+#endif
 #include <sstream>
 #include <typeinfo>
 
@@ -78,16 +80,20 @@ std::string IndexError::getMessage() const
 }
 //============================================================================================================
 bool check_FENV_OverUnder_Flow() {
+#ifdef HAVE_FENV_H
      fexcept_t ff;
      fegetexceptflag(&ff, FE_OVERFLOW || FE_UNDERFLOW || FE_INVALID);
      if (ff) {
         return true;
      }
+#endif
      return false;
 };
 //============================================================================================================
 void clear_FENV() {
+#ifdef HAVE_FENV_H
      feclearexcept(FE_ALL_EXCEPT);
+#endif
 }
 //============================================================================================================
 

src/thermo/GibbsExcessVPSSTP.cpp

@@ -207,10 +207,15 @@ void GibbsExcessVPSSTP::getActivityCoefficients(doublereal* const ac) const
             ac[k] = exp(ac[k]);
         }
         if (realNumberRangeBehavior_ == FENV_CHECK_CTRB) {
+#ifdef HAVE_FENV_H
             if (check_FENV_OverUnder_Flow()) {
                 throw CanteraError("GibbsExcessVPSSTP::getActivityCoefficients()",
                                    "activity coefficient is over/underflowing");
             }
+#else
+            throw CanteraError("GibbsExcessVPSSTP::getActivityCoefficients()",
+                               "realNumberRangeBehavior_ == FENV_CHECK_CTRB not supported by compiler");
+#endif
         }
     }
 }