Add basic Android OS detection. Some adjustments to endian detection to

avoid setting multiple endianness and to avoid including extra headers. Addition of some documentation to endian detection.
2013-03-19 23:45:35 -05:00
parent 99ed654ccd
commit 4c91cba47c
4 changed files with 233 additions and 82 deletions
--- a/doc/html/predef/reference/boost_os_operating_system_macros.html
+++ b/doc/html/predef/reference/boost_os_operating_system_macros.html
@ -171,6 +171,44 @@
 </table></div>
 <h5>
 <a name="predef.reference.boost_os_operating_system_macros.h2"></a>
+        <span class="phrase"><a name="predef.reference.boost_os_operating_system_macros.boost_os_android"></a></span><a class="link" href="boost_os_operating_system_macros.html#predef.reference.boost_os_operating_system_macros.boost_os_android"><code class="computeroutput"><span class="identifier">BOOST_OS_ANDROID</span></code></a>
+      </h5>
+<p>
+        <a href="http://en.wikipedia.org/wiki/Android_%28operating_system%29" target="_top">Android</a>
+        operating system.
+      </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                <p>
+                  Symbol
+                </p>
+              </th>
+<th>
+                <p>
+                  Version
+                </p>
+              </th>
+</tr></thead>
+<tbody><tr>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="identifier">__ANDROID__</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  <span class="bold"><strong>detection</strong></span>
+                </p>
+              </td>
+</tr></tbody>
+</table></div>
+<h5>
+<a name="predef.reference.boost_os_operating_system_macros.h3"></a>
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      </h5>
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@ -207,7 +245,7 @@
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@ -341,7 +379,7 @@
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@ -441,7 +479,7 @@
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+<a name="predef.reference.boost_os_operating_system_macros.h14"></a>
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@ -962,7 +1000,7 @@
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+<a name="predef.reference.boost_os_operating_system_macros.h15"></a>
        <span class="phrase"><a name="predef.reference.boost_os_operating_system_macros.boost_os_vms"></a></span><a class="link" href="boost_os_operating_system_macros.html#predef.reference.boost_os_operating_system_macros.boost_os_vms"><code class="computeroutput"><span class="identifier">BOOST_OS_VMS</span></code></a>
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@ -1025,7 +1063,7 @@
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+<a name="predef.reference.boost_os_operating_system_macros.h19"></a>
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+      </h5>
+<p>
+        <a href="http://en.wikipedia.org/wiki/Android_%28operating_system%29" target="_top">Android</a>
+        operating system.
+      </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                <p>
+                  Symbol
+                </p>
+              </th>
+<th>
+                <p>
+                  Version
+                </p>
+              </th>
+</tr></thead>
+<tbody><tr>
+<td>
+                <p>
+                  <code class="computeroutput"><span class="identifier">__ANDROID__</span></code>
+                </p>
+              </td>
+<td>
+                <p>
+                  <span class="bold"><strong>detection</strong></span>
+                </p>
+              </td>
+</tr></tbody>
+</table></div>
+<h5>
+<a name="predef.reference.boost_os_operating_system_macros.h20"></a>
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-<a name="predef.reference.boost_os_operating_system_macros.h35"></a>
+<a name="predef.reference.boost_os_operating_system_macros.h37"></a>
        <span class="phrase"><a name="predef.reference.boost_os_operating_system_macros.boost_os_vms0"></a></span><a class="link" href="boost_os_operating_system_macros.html#predef.reference.boost_os_operating_system_macros.boost_os_vms0"><code class="computeroutput"><span class="identifier">BOOST_OS_VMS</span></code></a>
      </h5>
 <p>
@ -2760,7 +2836,7 @@
 </tbody>
 </table></div>
 <h5>
-<a name="predef.reference.boost_os_operating_system_macros.h36"></a>
+<a name="predef.reference.boost_os_operating_system_macros.h38"></a>
        <span class="phrase"><a name="predef.reference.boost_os_operating_system_macros.boost_os_windows0"></a></span><a class="link" href="boost_os_operating_system_macros.html#predef.reference.boost_os_operating_system_macros.boost_os_windows0"><code class="computeroutput"><span class="identifier">BOOST_OS_WINDOWS</span></code></a>
      </h5>
 <p>
--- a/include/boost/predef/endian.h
+++ b/include/boost/predef/endian.h
@ -10,12 +10,35 @@ http://www.boost.org/LICENSE_1_0.txt)

 #include <boost/predef/version_number.h>
 #include <boost/predef/make.h>
-#include <boost/predef/library/c.h>
+#include <boost/predef/library/c/gnu.h>

 /*`
-[heading `BOOST_ENDIAN_BIG_BYTE`, `BOOST_ENDIAN_LITTLE_BYTE`, `BOOST_ENDIAN_BIG_WORD`, `BOOST_ENDIAN_LITTLE_WORD`]
+[heading `BOOST_ENDIAN_*`]

-Detection of endian memory ordering.
+Detection of endian memory ordering. There are four defined macros
+in this header that define the various generally possible endian
+memory orderings:
+
+* `BOOST_ENDIAN_BIG_BYTE`, byte-swapped big-endian.
+* `BOOST_ENDIAN_BIG_WORD`, word-swapped big-endian.
+* `BOOST_ENDIAN_LITTLE_BYTE`, byte-swapped little-endian.
+* `BOOST_ENDIAN_LITTLE_WORD`, word-swapped little-endian.
+
+The detection is conservative in that it only identifies endianness
+that it knows for certain. In particular bi-endianness is not
+indicated as is it not practically possible to determine the
+endianness from anything but an operating system provided
+header. And the currently known headers do not define that
+programatic bi-endianness is available.
+
+This implementation is a compilation of various publicly available
+information and acquired knowledge:
+
+# The indispensable documentation of "Pre-defined Compiler Macros"
+  [@http://sourceforge.net/p/predef/wiki/Endianness Endianness].
+# The various endian specifications available in the
+  [@http://wikipedia.org/ Wikipedia] computer architecture pages.
+# Generally available searches for headers that define endianness.
 */

 #define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
@ -23,62 +46,70 @@ Detection of endian memory ordering.
 #define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
 #define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE

-/* GNU libc provides a header defining __BYT_ORDER. */
-#if BOOST_LIB_C_GNU
-#   include <endian.h>
-#endif
-
-/* GNU libc style __BYTE_ORDER macros. */
-#if defined(__BYTE_ORDER)
-#   if (__BYTE_ORDER == __BIG_ENDIAN)
-#       undef BOOST_ENDIAN_BIG_BYTE
-#       define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+/* GNU libc provides a header defining __BYTE_ORDER, or _BYTE_ORDER.
+ */
+#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
+    !BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
+#   if BOOST_LIB_C_GNU
+#       include <endian.h>
 #   endif
-#   if (__BYTE_ORDER == __LITTLE_ENDIAN)
-#       undef BOOST_ENDIAN_LITTLE_BYTE
-#       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
-#   endif
-#   if (__BYTE_ORDER == __PDP_ENDIAN)
-#       undef BOOST_ENDIAN_LITTLE_WORD
-#       define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
+#   if defined(__BYTE_ORDER)
+#       if (__BYTE_ORDER == __BIG_ENDIAN)
+#           undef BOOST_ENDIAN_BIG_BYTE
+#           define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#       endif
+#       if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#           undef BOOST_ENDIAN_LITTLE_BYTE
+#           define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#       endif
+#       if (__BYTE_ORDER == __PDP_ENDIAN)
+#           undef BOOST_ENDIAN_LITTLE_WORD
+#           define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
+#       endif
 #   endif
 #endif

-/* Built-in byte-swpped big-endian macros. */
-#if !BOOST_ENDIAN_BIG_BYTE
-#   if defined(__BIG_ENDIAN__) || \
-        defined(__ARMEB__) || \
-        defined(__THUMBEB__) || \
-        defined(__AARCH64EB__) || \
-        defined(_MIPSEB) || \
-        defined(__MIPSEB) || \
-        defined(__MIPSEB__)
-#       undef BOOST_ENDIAN_BIG_BYTE
-#       define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+/* Built-in byte-swpped big-endian macros.
+ */
+#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
+    !BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
+#   if !BOOST_ENDIAN_BIG_BYTE
+#       if defined(__BIG_ENDIAN__) || \
+            defined(__ARMEB__) || \
+            defined(__THUMBEB__) || \
+            defined(__AARCH64EB__) || \
+            defined(_MIPSEB) || \
+            defined(__MIPSEB) || \
+            defined(__MIPSEB__)
+#           undef BOOST_ENDIAN_BIG_BYTE
+#           define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#       endif
 #   endif
 #endif

-/* Built-in byte-swapped little-endian macros. */
-#if !BOOST_ENDIAN_LITTLE_BYTE
-#   if defined(__LITTLE_ENDIAN__) || \
-        defined(__ARMEL__) || \
-        defined(__THUMBEL__) || \
-        defined(__AARCH64EL__) || \
-        defined(_MIPSEL) || \
-        defined(__MIPSEL) || \
-        defined(__MIPSEL__)
-#       undef BOOST_ENDIAN_LITTLE_BYTE
-#       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+/* Built-in byte-swpped little-endian macros.
+ */
+#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
+    !BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
+#   if !BOOST_ENDIAN_LITTLE_BYTE
+#       if defined(__LITTLE_ENDIAN__) || \
+            defined(__ARMEL__) || \
+            defined(__THUMBEL__) || \
+            defined(__AARCH64EL__) || \
+            defined(_MIPSEL) || \
+            defined(__MIPSEL) || \
+            defined(__MIPSEL__)
+#           undef BOOST_ENDIAN_LITTLE_BYTE
+#           define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
+#       endif
 #   endif
 #endif

 /* Some architectures are strictly one endianess (as opposed
 * the current common bi-endianess).
 */
-#if !BOOST_ENDIAN_BIG_BYTE && \
-    !BOOST_ENDIAN_BIG_WORD && \
-    !BOOST_ENDIAN_LITTLE_BYTE && \
-    !BOOST_ENDIAN_LITTLE_WORD
+#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
+    !BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
 #   include <boost/predef/architecture.h>
 #   if BOOST_ARCH_M68K || \
        BOOST_ARCH_PARISK || \
@ -99,13 +130,13 @@ Detection of endian memory ordering.
 #if BOOST_ENDIAN_BIG_BYTE
 #   define BOOST_ENDIAN_BIG_BYTE_AVAILABLE
 #endif
-#if BOOST_ENDIAN_BIG_WORD_BYTE
+#if BOOST_ENDIAN_BIG_WORD
 #   define BOOST_ENDIAN_BIG_WORD_BYTE_AVAILABLE
 #endif
 #if BOOST_ENDIAN_LITTLE_BYTE
 #   define BOOST_ENDIAN_LITTLE_BYTE_AVAILABLE
 #endif
-#if BOOST_ENDIAN_LITTLE_WORD_BYTE
+#if BOOST_ENDIAN_LITTLE_WORD
 #   define BOOST_ENDIAN_LITTLE_WORD_BYTE_AVAILABLE
 #endif

--- a/include/boost/predef/os.h
+++ b/include/boost/predef/os.h
@ -10,6 +10,7 @@ http://www.boost.org/LICENSE_1_0.txt)

 #include <boost/predef/os/aix.h>
 #include <boost/predef/os/amigaos.h>
+#include <boost/predef/os/android.h>
 #include <boost/predef/os/beos.h>
 #include <boost/predef/os/bsd.h>
 #include <boost/predef/os/cygwin.h>
--- a/include/boost/predef/os/android.h
+++ b/include/boost/predef/os/android.h
@ -0,0 +1,43 @@
+/*
+Copyright Redshift Software, Inc. 2013
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_PREDEF_OS_ADROID_H
+#define BOOST_PREDEF_OS_ADROID_H
+
+#include <boost/predef/version_number.h>
+#include <boost/predef/make.h>
+
+/*`
+[heading `BOOST_OS_ANDROID`]
+
+[@http://en.wikipedia.org/wiki/Android_%28operating_system%29 Android] operating system.
+
+[table
+    [[__predef_symbol__] [__predef_version__]]
+
+    [[`__ANDROID__`] [__predef_detection__]]
+    ]
+ */
+
+#define BOOST_OS_ANDROID BOOST_VERSION_NUMBER_NOT_AVAILABLE
+
+#if defined(__ANDROID__)
+#   undef BOOST_OS_ANDROID
+#   define BOOST_OS_ANDROID BOOST_VERSION_NUMBER_AVAILABLE
+#endif
+
+#if BOOST_OS_ANDROID
+#   define BOOST_OS_ANDROID_AVAILABLE
+#endif
+
+#define BOOST_OS_ANDROID_NAME "Android"
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_OS_ANDROID,BOOST_OS_ANDROID_NAME)
+
+
+#endif