From 7b09710392d35fb55b52031d447a542d99fc6b4b Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 19 Aug 2014 17:10:03 -0400
Subject: Modularize the libdimension codebase.

---
 libdimension/dimension/base/compiler.h | 139 +++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 libdimension/dimension/base/compiler.h

(limited to 'libdimension/dimension/base/compiler.h')

diff --git a/libdimension/dimension/base/compiler.h b/libdimension/dimension/base/compiler.h
new file mode 100644
index 0000000..a83f1b9
--- /dev/null
+++ b/libdimension/dimension/base/compiler.h
@@ -0,0 +1,139 @@
+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Compiler abstractions.
+ */
+
+#ifndef DMNSN_BASE_H
+#error "Please include <dimension/base.h> instead of this header directly."
+#endif
+
+/**
+ * @internal
+ * @def DMNSN_C_VERSION
+ * The C version according to \p __STDC_VERSION__ if available, otherwise 0.
+ */
+#ifdef __STDC_VERSION__
+  #define DMNSN_C_VERSION __STDC_VERSION__
+#else
+  #define DMNSN_C_VERSION 0L
+#endif
+
+/**
+ * @internal
+ * @def DMNSN_CXX_VERSION
+ * The C++ version according to \p __cplusplus if available, otherwise 0.
+ */
+#ifdef __cplusplus
+  #define DMNSN_CXX_VERSION __cplusplus
+#else
+  #define DMNSN_CXX_VERSION 0L
+#endif
+
+/**
+ * @internal
+ * Whether we're being compiled as C++.
+ */
+#define DMNSN_CXX (DMNSN_CXX_VERSION > 0)
+
+/**
+ * @internal
+ * Whether C++11 features are supported.
+ */
+#define DMNSN_CXX11 (DMNSN_CXX_VERSION >= 201103L)
+
+/**
+ * @internal
+ * Whether C99 features are supported.
+ */
+#define DMNSN_C99 (DMNSN_C_VERSION >= 199901L || DMNSN_CXX11)
+
+/**
+ * @internal
+ * Whether C11 features are supported.
+ */
+#define DMNSN_C11 (DMNSN_C_VERSION >= 201112L)
+
+/**
+ * @internal
+ * Whether GNU C features are supported.
+ */
+#define DMNSN_GNUC defined(__GNUC__)
+
+/**
+ * @def DMNSN_INLINE
+ * A portable inline specifier. Expands to the correct method of declaring
+ * inline functions for the version of C you are using.
+ */
+#ifndef DMNSN_INLINE
+  #if DMNSN_CXX
+    /* C++ inline semantics */
+    #define DMNSN_INLINE inline
+  #elif DMNSN_C99
+    /* C99 inline semantics */
+    #define DMNSN_INLINE inline
+  #elif DMNSN_GNUC
+    /* GCC inline semantics */
+    #define DMNSN_INLINE __extension__ extern __inline__
+  #else
+    /* Unknown C - mark functions static and hope the compiler is smart enough
+       to inline them */
+    #define DMNSN_INLINE static
+  #endif
+#endif
+
+/**
+ * @def DMNSN_NORETURN
+ * A portable noreturn attribute.
+ */
+#if DMNSN_CXX11
+  #define DMNSN_NORETURN [[noreturn]] void
+#elif DMNSN_C11
+  #define DMNSN_NORETURN _Noreturn void
+#elif DMNSN_GNUC
+  #define DMNSN_NORETURN __attribute__((noreturn)) void
+#else
+  #define DMNSN_NORETURN void
+#endif
+
+/**
+ * @internal
+ * @def DMNSN_FUNC
+ * @brief Expands to the name of the current function
+ */
+#if DMNSN_GNUC
+  #define DMNSN_FUNC __PRETTY_FUNCTION__
+#elif DMNSN_C99
+  #define DMNSN_FUNC __func__
+#else
+  #define DMNSN_FUNC "<unknown function>"
+#endif
+
+/**
+ * @internal
+ * An unreachable statement.
+ */
+#if DMNSN_GNUC
+  #define DMNSN_UNREACHABLE() __builtin_unreachable()
+#else
+  #define DMNSN_UNREACHABLE() ((void)0)
+#endif
-- 
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