X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=internals%2F_PDCLIB_aux.h;h=484e930f24618c24fbee7dc563835e441ceeed35;hp=0844962b5f3aec80e58bbae0cca1acfdd6b47832;hb=5af6a81428deb4542b01eed33f450057c7fa89c2;hpb=c5d49235e09fbd58416f10dec2799e61cf3431c8

diff --git a/internals/_PDCLIB_aux.h b/internals/_PDCLIB_aux.h
index 0844962..484e930 100644
--- a/internals/_PDCLIB_aux.h
+++ b/internals/_PDCLIB_aux.h
@@ -1,5 +1,5 @@
-#ifndef _PDCLIB_AUX_H
-#define _PDCLIB_AUX_H
+#ifndef __PDCLIB_AUX_H
+#define __PDCLIB_AUX_H __PDCLIB_AUX_H
 
 /* Auxiliary PDCLib code <_PDCLIB_aux.h>
 
@@ -23,39 +23,113 @@
 #endif
 
 #if defined(_PDCLIB_C_VERSION)
-	/* Pass - conditional simplification case */
+    /* Pass - conditional simplification case */
 #elif !defined(__STDC_VERSION__)
-	#define _PDCLIB_C_VERSION 1990
+    #define _PDCLIB_C_VERSION 1990
 #elif __STDC_VERSION__ == 199409L
-	#define _PDCLIB_C_VERSION 1995
+    #define _PDCLIB_C_VERSION 1995
 #elif __STDC_VERSION__ == 199901L
-	#define _PDCLIB_C_VERSION 1999
+    #define _PDCLIB_C_VERSION 1999
 #elif __STDC_VERSION__ == 201112L
-	#define _PDCLIB_C_VERSION 2011
+    #define _PDCLIB_C_VERSION 2011
 #else
-	#error Unsupported _ _STDC_VERSION_ _ (__STDC_VERSION__) (supported: ISO/IEC 9899:1990, 9899/AMD1:1995, 9899:1999, 9899:2011).
+    #error Unsupported _ _STDC_VERSION_ _ (__STDC_VERSION__) (supported: ISO/IEC 9899:1990, 9899/AMD1:1995, 9899:1999, 9899:2011).
 #endif
 
 #if !defined(__cplusplus) || defined(_PDCLIB_CXX_VERSION)
    #define _PDCLIB_CXX_VERSION 0
 #elif __cplusplus == 201103L
-	#define _PDCLIB_CXX_VERSION 2011
+    #define _PDCLIB_CXX_VERSION 2011
     /* TODO: Do we want this? */
-	#if _PDCLIB_C_VERSION < 2011
-		#undef _PDCLIB_C_VERSION
-   		#define _PDCLIB_C_VERSION 2011
-	#endif
+    #if _PDCLIB_C_VERSION < 2011
+        #undef _PDCLIB_C_VERSION
+        #define _PDCLIB_C_VERSION 2011
+    #endif
 #elif __cplusplus == 199711L
    #define _PDCLIB_CXX_VERSION 1997
 #else
    #error Unsupported _ _cplusplus (__cplusplus) (supported: ISO/IEC 14882:1997, ISO/IEC 14882:2011).
 #endif
 
+#ifndef __STDC_HOSTED__
+    #error Compiler does not define _ _STDC_HOSTED_ _ (not standard-compliant)!
+#elif __STDC_HOSTED__ == 0
+    #define _PDCLIB_HOSTED 0
+#elif __STDC_HOSTED__ == 1
+    #define _PDCLIB_HOSTED 1
+#else
+    #error Compiler does not define _ _STDC_HOSTED_ _ to 0 or 1 (not standard-compliant)!
+#endif
+
+#ifdef __cplusplus
+    #define _PDCLIB_BEGIN_EXTERN_C extern "C" {
+    #define _PDCLIB_END_EXTERN_C }
+    typedef bool _PDCLIB_bool;
+#else
+    #define _PDCLIB_BEGIN_EXTERN_C
+    #define _PDCLIB_END_EXTERN_C
+    typedef _Bool _PDCLIB_bool;
+#endif
+
+/* Clang style feature detection macros
+ * Note: It is common to #define __has_feature(0) if undefined so the presence
+ * of this macro does not guarantee it to be working
+ */
+
+#ifdef __has_feature
+   #define _PDCLIB_HAS_FEATURE(x) __has_feature(x)
+#else
+   #define _PDCLIB_HAS_FEATURE(x) (0)
+#endif
+
+#ifdef __has_extension
+   #define _PDCLIB_HAS_EXTENSION(x) __has_extension(x)
+#else
+   // Older versions of Clang use __has_feature instead
+   #define _PDCLIB_HAS_EXTENSION(x) _PDCLIB_HAS_FEATURE(x)
+#endif
+
+#ifdef __has_builtin
+   #define _PDCLIB_HAS_BUILTIN(x) __has_builtin(x)
+#else
+   #define _PDCLIB_HAS_BUILTIN(x) (0)
+#endif
+
+#ifdef __has_attribute
+   #define _PDCLIB_HAS_ATTRIBUTE(x) __has_attribute(x)
+#else
+   #define _PDCLIB_HAS_ATTRIBUTE(x) (0)
+#endif
+
+/* GCC feature detection macros */
+
+#if defined(__GNUC__)
+    #define _PDCLIB_GCC_MIN(maj, min) \
+        ((__GNUC__ > maj) || (__GNUC__ == maj && __GNUC_MINOR__ >= min))
+#else
+    #define _PDCLIB_GCC_MIN(maj, min) (0)
+#endif
+
+/* Hybrid GCC/Clang feature detection macros */
+#define _PDCLIB_GCC_FEATURE(x, gccmaj, gccmin) \
+        (_PDCLIB_HAS_FEATURE(x) || _PDCLIB_GCC_MIN(gccmin, gccmaj))
+
+#define _PDCLIB_GCC_EXTENSION(x, gccmaj, gccmin) \
+        (_PDCLIB_HAS_EXTENSION(x) || _PDCLIB_GCC_MIN(gccmin, gccmaj))
+
+#define _PDCLIB_GCC_BUILTIN(x, gccmaj, gccmin) \
+        (_PDCLIB_HAS_BUILTIN(x) || _PDCLIB_GCC_MIN(gccmin, gccmaj))
+
+#define _PDCLIB_GCC_ATTRIBUTE(x, gccmaj, gccmin) \
+        (_PDCLIB_HAS_ATTRIBUTE(x) || _PDCLIB_GCC_MIN(gccmin, gccmaj))
+
+/* Extension & Language feature detection */
+
 #if _PDCLIB_C_VERSION >= 1999 || defined(__cplusplus)
-	#ifndef __cplusplus
-		#define _PDCLIB_restrict restrict
-  	#endif
-	#define _PDCLIB_inline   inline
+    #ifndef __cplusplus
+        #define _PDCLIB_restrict restrict
+    #endif
+    #define _PDCLIB_inline   inline
 #endif
 
 #if _PDCLIB_CXX_VERSION >= 2011
@@ -66,11 +140,10 @@
   #define _PDCLIB_noexcept
 #endif
 
-#if _PDCLIB_CXX_VERSION >= 2011
-  // Hold off on C++ attribute syntax for now
-  // #define _PDCLIB_noreturn [[noreturn]]
-#elif _PDCLIB_C_VERSION >= 2011
-	#define _PDCLIB_noreturn _Noreturn
+#if _PDCLIB_CXX_VERSION >= 2011 && _PDCLIB_GCC_FEATURE(cxx_attributes, 4, 8)
+    #define _PDCLIB_noreturn [[noreturn]]
+#elif _PDCLIB_C_VERSION >= 2011 && _PDCLIB_GCC_FEATURE(c_noreturn, 4, 7)
+    #define _PDCLIB_noreturn _Noreturn
 #endif
 
 #ifdef _WIN32
@@ -78,93 +151,94 @@
    #define _PDCLIB_IMPORT __declspec(dllimport)
 #endif
 
-#ifdef __GNUC__
-	  #ifndef _PDCLIB_EXPORT
-  	    #define _PDCLIB_EXPORT __attribute__((__visibility__("protected")))
-    #endif
-
-   	#ifndef _PDCLIB_IMPORT
-		#define _PDCLIB_IMPORT
-   	#endif
+#if !defined(_PDCLIB_EXPORT) && _PDCLIB_GCC_ATTRIBUTE(__visibility__, 4, 0)
+    #define _PDCLIB_EXPORT __attribute__((__visibility__("protected")))
+#endif
 
-   	#ifndef _PDCLIB_HIDDEN
-   		#define _PDCLIB_HIDDEN __attribute__((__visibility__("hidden")))
-   	#endif
+#if !defined(_PDCLIB_HIDDEN) && _PDCLIB_GCC_ATTRIBUTE(__visibility__, 4, 0)
+    #define _PDCLIB_HIDDEN __attribute__((__visibility__("hidden")))
+#endif
 
-    #ifndef _PDCLIB_nothrow
-      #define _PDCLIB_nothrow __attribute__((__nothrow__))
-      #define _PDCLIB_noexcept
-    #endif
+#if !defined(_PDCLIB_nothrow) && _PDCLIB_GCC_ATTRIBUTE(__nothrow__, 4, 0)
+    #define _PDCLIB_nothrow __attribute__((__nothrow__))
+    #define _PDCLIB_noexcept
+#endif
 
-	#ifndef _PDCLIB_restrict
-		#define _PDCLIB_restrict __restrict
-	#endif
+#if !defined(_PDCLIB_restrict) && _PDCLIB_GCC_MIN(3, 0)
+    #define _PDCLIB_restrict __restrict
+#endif
 
-	#ifndef _PDCLIB_inline
-		#define _PDCLIB_inline __inline
-	#endif
+#if !defined(_PDCLIB_inline) && _PDCLIB_GCC_MIN(3, 0)
+    #define _PDCLIB_inline __inline
+#endif
 
-	#ifndef _PDCLIB_noreturn
+#if !defined(_PDCLIB_noreturn) && _PDCLIB_GCC_ATTRIBUTE(__noreturn__, 3, 0)
     /* If you don't use __noreturn__, then stdnoreturn.h will break things! */
-		#define _PDCLIB_noreturn __attribute__((__noreturn__))
-	#endif
+    #define _PDCLIB_noreturn __attribute__((__noreturn__))
+#endif
+
+#if !defined(_PDCLIB_DEPRECATED) && _PDCLIB_GCC_ATTRIBUTE(__deprecated__, 3, 0)
+    #define _PDCLIB_DEPRECATED __attribute__ ((__deprecated__))
 #endif
 
+#if !defined(_PDCLIB_UNREACHABLE) && _PDCLIB_GCC_BUILTIN(__builtin_unreachable, 4, 0)
+    #define _PDCLIB_UNREACHABLE __builtin_unreachable()
+#endif
+
+#if !defined(_PDCLIB_UNDEFINED) && defined(__GNUC__)
+    #define _PDCLIB_UNDEFINED(_var) \
+        do { __asm__("" : "=X"(_var)); } while(0)
+#endif
+
+/* No-op fallbacks */
+
 #ifndef _PDCLIB_nothrow
   #define _PDCLIB_nothrow
   #define _PDCLIB_noexcept
 #endif
 
 #ifndef _PDCLIB_EXPORT
-   	#define _PDCLIB_EXPORT
+    #define _PDCLIB_EXPORT
 #endif
 #ifndef _PDCLIB_IMPORT
-   	#define _PDCLIB_IMPORT
+    #define _PDCLIB_IMPORT
 #endif
 #ifndef _PDCLIB_HIDDEN
-   	#define _PDCLIB_HIDDEN
+    #define _PDCLIB_HIDDEN
 #endif
 
 #if defined(_PDCLIB_SHARED) 
-   	#if defined(_PDCLIB_BUILD)
-   		#define _PDCLIB_API _PDCLIB_EXPORT
-   	#else
-   		#define _PDCLIB_API _PDCLIB_IMPORT
-   	#endif
+    #if defined(_PDCLIB_BUILD)
+        #define _PDCLIB_API _PDCLIB_EXPORT
+    #else
+        #define _PDCLIB_API _PDCLIB_IMPORT
+    #endif
 #else
-   	#define _PDCLIB_API
+    #define _PDCLIB_API
 #endif
 
 #ifndef _PDCLIB_restrict
-	#define _PDCLIB_restrict
+      #define _PDCLIB_restrict
 #endif
 
 #ifndef _PDCLIB_inline
-	#define _PDCLIB_inline
+      #define _PDCLIB_inline
 #endif
 
 #ifndef _PDCLIB_noreturn
-	#define _PDCLIB_noreturn
+      #define _PDCLIB_noreturn
 #endif
 
-#ifndef __STDC_HOSTED__
-#error Compiler does not define _ _STDC_HOSTED_ _ (not standard-compliant)!
-#elif __STDC_HOSTED__ == 0
-#define _PDCLIB_HOSTED 0
-#elif __STDC_HOSTED__ == 1
-#define _PDCLIB_HOSTED 1
-#else
-#error Compiler does not define _ _STDC_HOSTED_ _ to 0 or 1 (not standard-compliant)!
+#ifndef _PDCLIB_DEPRECATED
+    #define _PDCLIB_DEPRECATED
 #endif
 
-#ifdef __cplusplus
-	#define _PDCLIB_BEGIN_EXTERN_C extern "C" {
-	#define _PDCLIB_END_EXTERN_C }
-  typedef bool _PDCLIB_bool;
-#else
-  #define _PDCLIB_BEGIN_EXTERN_C
-  #define _PDCLIB_END_EXTERN_C
-  typedef _Bool _PDCLIB_bool;
+#ifndef _PDCLIB_UNREACHABLE
+    #define _PDCLIB_UNREACHABLE do {} while(0)
+#endif
+
+#ifndef _PDCLIB_UNDEFINED
+    #define _PDCLIB_UNDEFINED(_var) do {} while(0)
 #endif
 
 /*#if _PDCLIB_C_VERSION != 1999
@@ -187,9 +261,9 @@
 /* Feature test macros
  *
  * All of the feature test macros come in the following forms
- *   _PDCLIB_*_MIN(min):            Available in versions > min
- *   _PDCLIB_*_MINMAX(min, max):    Available in versions > min < max
- *   _PDCLIB_*_MAX(max):            Availabel in versions < max
+ *   _PDCLIB_*_MIN(min):            Available in versions >= min
+ *   _PDCLIB_*_MINMAX(min, max):    Available in versions >= min <= max
+ *   _PDCLIB_*_MAX(max):            Availabel in versions <= max
  *
  * The defined tests are:
  *   C:     C standard versions