We're going to use the C99 isinf() and isnan() macros wherever possible now. If your compiler doesn't support this, define UNITY_EXCLUDE_MATH_H and it will go back to the old method

src/unity.c

@@ -44,13 +44,10 @@ const char UnityStrResultsTests[]           = " Tests ";
 const char UnityStrResultsFailures[]        = " Failures ";
 const char UnityStrResultsIgnored[]         = " Ignored ";
 
-#ifndef UNITY_EXCLUDE_FLOAT
+#ifdef UNITY_FLOAT_NEEDS_ZERO
 // Dividing by these constants produces +/- infinity.
 // The rationale is given in UnityAssertFloatIsInf's body.
 static const _UF f_zero = 0.0f;
-#ifndef UNITY_EXCLUDE_DOUBLE
-static const _UD d_zero = 0.0;
-#endif
 #endif
 
 // compiler-generic print formatting masks
@@ -738,29 +735,30 @@ void UnityAssertFloatSpecial(const _UF actual,
         //We are using a variable to hold the zero value because some compilers complain about dividing by zero otherwise
         case UNITY_FLOAT_IS_INF:
         case UNITY_FLOAT_IS_NOT_INF:
-            is_trait = ((1.0f / f_zero) == actual) ? 1 : 0;
+            is_trait = isinf(actual) & ispos(actual);
             break;
         case UNITY_FLOAT_IS_NEG_INF:
         case UNITY_FLOAT_IS_NOT_NEG_INF:
-            is_trait = ((-1.0f / f_zero) == actual) ? 1 : 0;
+            is_trait = isinf(actual) & isneg(actual);
             break;
 
         //NaN is the only floating point value that does NOT equal itself. Therefore if Actual == Actual, then it is NOT NaN.
         case UNITY_FLOAT_IS_NAN:
         case UNITY_FLOAT_IS_NOT_NAN:
-            is_trait = (actual == actual) ? 0 : 1;
+            is_trait = isnan(actual);
             break;
 
         //A determinate number is non infinite and not NaN. (therefore the opposite of the two above)
         case UNITY_FLOAT_IS_DET:
         case UNITY_FLOAT_IS_NOT_DET:
-            if ( (actual != actual) || ((1.0f / f_zero) == actual) || ((-1.0f / f_zero) == actual) )
+            if (isinf(actual) | isnan(actual))
                 is_trait = 0;
             else
                 is_trait = 1;
             break;
-	default:
-	    ;
+
+        default:
+            break;
     }
 
     if (is_trait != should_be_trait)
@@ -894,35 +892,36 @@ void UnityAssertDoubleSpecial(const _UD actual,
 
     UNITY_SKIP_EXECUTION;
 
-    switch(style)
+     switch(style)
     {
         //To determine Inf / Neg Inf, we compare to an Inf / Neg Inf value we create on the fly
         //We are using a variable to hold the zero value because some compilers complain about dividing by zero otherwise
         case UNITY_FLOAT_IS_INF:
         case UNITY_FLOAT_IS_NOT_INF:
-            is_trait = ((1.0 / d_zero) == actual) ? 1 : 0;
+            is_trait = isinf(actual) & ispos(actual);
             break;
         case UNITY_FLOAT_IS_NEG_INF:
         case UNITY_FLOAT_IS_NOT_NEG_INF:
-            is_trait = ((-1.0 / d_zero) == actual) ? 1 : 0;
+            is_trait = isinf(actual) & isneg(actual);
             break;
 
         //NaN is the only floating point value that does NOT equal itself. Therefore if Actual == Actual, then it is NOT NaN.
         case UNITY_FLOAT_IS_NAN:
         case UNITY_FLOAT_IS_NOT_NAN:
-            is_trait = (actual == actual) ? 0 : 1;
+            is_trait = isnan(actual);
             break;
 
         //A determinate number is non infinite and not NaN. (therefore the opposite of the two above)
         case UNITY_FLOAT_IS_DET:
         case UNITY_FLOAT_IS_NOT_DET:
-            if ( (actual != actual) || ((1.0 / d_zero) == actual) || ((-1.0 / d_zero) == actual) )
+            if (isinf(actual) | isnan(actual))
                 is_trait = 0;
             else
                 is_trait = 1;
             break;
-	default:
-	    ;
+
+        default:
+            break;
     }
 
     if (is_trait != should_be_trait)

src/unity_internals.h

@@ -36,6 +36,11 @@
 //apparently this is not a constant expression: (sizeof(unsigned int *) * 256 - 1) so we have to just let this fall through
 #endif
 #endif
+
+#ifndef UNITY_EXCLUDE_MATH_H
+#include <math.h>
+#endif
+
 //-------------------------------------------------------
 // Guess Widths If Not Specified
 //-------------------------------------------------------
@@ -214,6 +219,23 @@ typedef _US64 _U_SINT;
 #endif
 typedef UNITY_FLOAT_TYPE _UF;
 
+#ifndef isinf
+#define isinf(n) (((1.0f / f_zero) == n) ? 1 : 0) || (((-1.0f / f_zero) == n) ? 1 : 0)
+#define UNITY_FLOAT_NEEDS_ZERO
+#endif
+
+#ifndef isnan
+#define isnan(n) ((n != n) ? 1 : 0)
+#endif
+
+#ifndef isneg
+#define isneg(n) ((n < 0.0f) ? 1 : 0)
+#endif
+
+#ifndef ispos
+#define ispos(n) ((n > 0.0f) ? 1 : 0)
+#endif
+
 #endif
 
 //-------------------------------------------------------

test/targets/clang_file.yml

@@ -0,0 +1,83 @@
+---
+compiler:
+  path: clang
+  source_path:     '../src/'
+  unit_tests_path: &unit_tests_path 'tests/'
+  build_path:      &build_path 'build/'
+  options:
+    - '-c'
+    - '-Wall'
+    - '-Wextra'
+    - '-Werror'
+    - '-Wcast-qual'
+    - '-Wconversion'
+    - '-Wdisabled-optimization'
+    - '-Wformat=2'
+    - '-Winit-self'
+    - '-Winline'
+    - '-Winvalid-pch'
+    - '-Wmissing-declarations'
+    - '-Wmissing-include-dirs'
+    - '-Wmissing-prototypes'
+    - '-Wnonnull'
+    - '-Wpacked'
+    - '-Wpointer-arith'
+    - '-Wredundant-decls'
+    - '-Wswitch-default'
+    - '-Wstrict-aliasing'
+    - '-Wstrict-overflow=5'
+    - '-Wuninitialized'
+    - '-Wunused'
+    - '-Wunreachable-code'
+    - '-Wreturn-type'
+    - '-Wshadow'
+    - '-Wundef'
+    - '-Wwrite-strings'
+    - '-Wno-missing-declarations'
+    - '-Wno-missing-prototypes'
+    - '-Wno-nested-externs'
+    - '-Wno-redundant-decls'
+    - '-Wno-unused-parameter'
+    - '-Wno-variadic-macros'
+    - '-Wbad-function-cast'
+    - '-fms-extensions'
+    - '-fno-omit-frame-pointer'
+    - '-ffloat-store'
+    - '-fno-common'
+    - '-fstrict-aliasing'
+    - '-std=gnu99'
+    - '-pedantic'
+    - '-O0'
+  includes:
+    prefix: '-I'
+    items:
+      - 'src/'
+      - '../src/'
+      - *unit_tests_path
+  defines:
+    prefix: '-D'
+    items:
+      - UNITY_INCLUDE_DOUBLE
+      - UNITY_SUPPORT_64
+      - UNITY_OUTPUT_RESULTS_FILE
+  object_files:
+    prefix: '-o'
+    extension: '.o'
+    destination: *build_path
+linker:
+  path: gcc
+  options:
+    - -lm
+    - '-m64'
+  includes:
+    prefix: '-I'
+  object_files:
+    path: *build_path
+    extension: '.o'
+  bin_files:
+    prefix: '-o'
+    extension: '.exe'
+    destination: *build_path
+colour: true
+:unity:
+  :plugins: []

test/targets/gcc_manual_math.yml

@@ -0,0 +1,46 @@
+compiler:
+  path: gcc
+  source_path:     '../src/'
+  unit_tests_path: &unit_tests_path 'tests/'
+  build_path:      &build_path 'build/'
+  options:
+    - '-c'
+    - '-m64'
+    - '-Wall'
+    - '-Wno-address'
+    - '-std=c99'
+    - '-pedantic'
+  includes:
+    prefix: '-I'
+    items:
+      - 'src/'
+      - '../src/'
+      - *unit_tests_path
+  defines:
+    prefix: '-D'
+    items:
+      - UNITY_EXCLUDE_MATH_H
+      - UNITY_INCLUDE_DOUBLE
+      - UNITY_SUPPORT_TEST_CASES
+      - UNITY_SUPPORT_64
+  object_files:
+    prefix: '-o'
+    extension: '.o'
+    destination: *build_path
+linker:
+  path: gcc
+  options:
+    - -lm
+    - '-m64'
+  includes:
+    prefix: '-I'
+  object_files:
+    path: *build_path
+    extension: '.o'
+  bin_files:
+    prefix: '-o'
+    extension: '.exe'
+    destination: *build_path
+colour: true
+:unity:
+  :plugins: []