Preventing the compilation of floating points with GCC when glibc is …

…not in use

- Gathering the support of FPE in one place/several macros and using those in both
  execution_monitor.hpp and execution_monitor.ipp in a more coherent way
- Updating the support of the floating point exceptions: fenableexcept/fdisableexcept are
  GLIBC extensions and the definition of FENV does not imply the existance of those functions

include/boost/test/execution_monitor.hpp

@@ -66,6 +66,19 @@
 
 #endif
 
+#if defined(BOOST_SEH_BASED_SIGNAL_HANDLING) && !defined(UNDER_CE)
+  //! Indicates tha the floating point exception handling is supported
+  //! through SEH
+  #define BOOST_TEST_FPE_SUPPORT_WITH_SEH__
+#elif !defined(BOOST_SEH_BASED_SIGNAL_HANDLING) && !defined(UNDER_CE)
+  #if !defined(BOOST_NO_FENV_H) && !defined(BOOST_CLANG) && \
+      (defined(__GLIBC__) && defined(__USE_GNU))
+  //! Indicates that floating point exception handling is supported for the
+  //! non SEH version of it, for the GLIBC extensions only
+  #define BOOST_TEST_FPE_SUPPORT_WITH_GLIBC_EXTENSIONS__
+  #endif
+#endif
+
 
 // Additional macro documentations not being generated without this hack
 #ifdef BOOST_TEST_DOXYGEN_DOC__
@@ -489,7 +502,7 @@ namespace fpe {
 enum masks {
     BOOST_FPE_OFF       = 0,
 
-#ifdef BOOST_SEH_BASED_SIGNAL_HANDLING /* *** */
+#if defined(BOOST_TEST_FPE_SUPPORT_WITH_SEH__) /* *** */
     BOOST_FPE_DIVBYZERO = EM_ZERODIVIDE,
     BOOST_FPE_INEXACT   = EM_INEXACT,
     BOOST_FPE_INVALID   = EM_INVALID,
@@ -498,7 +511,7 @@ enum masks {
 
     BOOST_FPE_ALL       = MCW_EM,
 
-#elif defined(BOOST_NO_FENV_H) || defined(BOOST_CLANG) /* *** */
+#elif !defined(BOOST_TEST_FPE_SUPPORT_WITH_GLIBC_EXTENSIONS__)/* *** */
     BOOST_FPE_ALL       = BOOST_FPE_OFF,
 
 #else /* *** */

include/boost/test/impl/execution_monitor.ipp

@@ -1354,11 +1354,7 @@ unsigned
 enable( unsigned mask )
 {
     boost::ignore_unused(mask);
-
-#if defined(UNDER_CE)
-    /* Not Implemented in Windows CE */
-    return BOOST_FPE_OFF;
-#elif defined(BOOST_SEH_BASED_SIGNAL_HANDLING)
+#if defined(BOOST_TEST_FPE_SUPPORT_WITH_SEH__)
     _clearfp();
 
 #if BOOST_WORKAROUND( BOOST_MSVC, <= 1310)
@@ -1373,9 +1369,10 @@ enable( unsigned mask )
     if( ::_controlfp_s( 0, old_cw & ~mask, BOOST_FPE_ALL ) != 0 )
         return BOOST_FPE_INV;
 #endif
-
     return ~old_cw & BOOST_FPE_ALL;
-#elif defined(__GLIBC__) && defined(__USE_GNU)
+
+#elif defined(BOOST_TEST_FPE_SUPPORT_WITH_GLIBC_EXTENSIONS__)
+    // same macro definition as in execution_monitor.hpp
     if (BOOST_FPE_ALL == BOOST_FPE_OFF)
         /* Not Implemented */
         return BOOST_FPE_OFF;
@@ -1395,12 +1392,8 @@ disable( unsigned mask )
 {
     boost::ignore_unused(mask);
 
-#if defined(UNDER_CE)
-    /* Not Implemented in Windows CE */
-    return BOOST_FPE_INV;
-#elif defined(BOOST_SEH_BASED_SIGNAL_HANDLING)
+#if defined(BOOST_TEST_FPE_SUPPORT_WITH_SEH__)
     _clearfp();
-
 #if BOOST_WORKAROUND( BOOST_MSVC, <= 1310)
     unsigned old_cw = ::_controlfp( 0, 0 );
     ::_controlfp( old_cw | mask, BOOST_FPE_ALL );
@@ -1413,9 +1406,9 @@ disable( unsigned mask )
     if( ::_controlfp_s( 0, old_cw | mask, BOOST_FPE_ALL ) != 0 )
         return BOOST_FPE_INV;
 #endif
-
     return ~old_cw & BOOST_FPE_ALL;
-#elif defined(__GLIBC__) && defined(__USE_GNU)
+
+#elif defined(BOOST_TEST_FPE_SUPPORT_WITH_GLIBC_EXTENSIONS__)
     if (BOOST_FPE_ALL == BOOST_FPE_OFF)
         /* Not Implemented */
         return BOOST_FPE_INV;