OpenCV 2.4.7 porting to PNaCl

ports/opencv/nacl.patch

+diff --git opencv-v2.4.7/XCompile-nacl.txt opencv-v2.4.7.nacl/XCompile-nacl.txt
+new file mode 100644
+index 0000000..c651a2a
+--- /dev/null
++++ opencv-2.4.7.nacl/XCompile-nacl.txt
+@@ -0,0 +1,17 @@
++# the name of the target operating system
++SET(CMAKE_SYSTEM_NAME Linux)
++
++SET(NACL_CROSS_PREFIX nacl)
++
++# which compilers to use for C and C++
++SET(CMAKE_C_COMPILER "${NACLCC}")
++SET(CMAKE_CXX_COMPILER "${NACLCXX}")
++set(CMAKE_AR ${NACLAR} CACHE FILEPATH "Archiver")
++SET(CMAKE_LINKER "${NACLLD}")
++SET(_CMAKE_TOOLCHAIN_PREFIX ${NACL_CROSS_PREFIX})
++
++# here is the target environment located
++SET(CMAKE_FIND_ROOT_PATH ${NACL_TOOLCHAIN_ROOT})
++
++# nacl abi says 32bits little endian
++set(CMAKE_SIZEOF_VOID_P 4)
+diff -Naur opencv-2.4.7/modules/contrib/src/inputoutput.cpp opencv-2.4.7.nacl/modules/contrib/src/inputoutput.cpp
+--- opencv-2.4.7/modules/contrib/src/inputoutput.cpp    2013-11-06 15:26:39.000000000 +0100
++++ opencv-2.4.7.nacl/modules/contrib/src/inputoutput.cpp       2013-11-19 21:00:51.000000000 +0100
+@@ -76,7 +76,8 @@
+             {
+                 return list;
+             }
+-
++// NaCl does not define struct fields to deal with folders.
++#ifndef __native_client__
+             while ((dirp = readdir(dp)) != NULL)
+             {
+                 if (dirp->d_type == DT_REG)
+@@ -89,6 +90,7 @@
+                 }
+             }
+             closedir(dp);
++#endif  //#ifndef __native__client__
+         #endif
+ 
+         return list;
+@@ -166,7 +168,8 @@
+             {
+                 return list;
+             }
+-
++// NaCl does not define struct fields to deal with folders.
++#ifndef __native_client__
+             while ((dirp = readdir(dp)) != NULL)
+             {
+                 if (dirp->d_type == DT_DIR &&
+@@ -181,6 +184,8 @@
+                 }
+             }
+             closedir(dp);
++#endif  //#ifndef __native__client__
++
+         #endif
+ 
+         return list;
+diff -Naur opencv-2.4.7/modules/core/include/opencv2/core/operations.hpp opencv-2.4.7.nacl/modules/core/include/opencv2/core/operations.hpp
+--- opencv-2.4.7/modules/core/include/opencv2/core/operations.hpp       2013-11-06 15:26:39.000000000 +0100
++++ opencv-2.4.7.nacl/modules/core/include/opencv2/core/operations.hpp  2013-11-19 21:03:40.000000000 +0100
+@@ -58,7 +58,13 @@
+ 
+   #if defined __clang__ && __clang_major__ >= 3 && !defined __ANDROID__
+     #ifdef __ATOMIC_SEQ_CST
++     // Clang in NaCl "cannot compile this atomic library call yet": use 
++     // instead a programmatic atomic fetch.
++     #ifndef __native_client__
+         #define CV_XADD(addr, delta) __c11_atomic_fetch_add((_Atomic(int)*)(addr), (delta), __ATOMIC_SEQ_CST)
++     #else
++        int CV_XADD(int* addr, int delta) { int tmp = *addr; *addr += delta; return tmp; }
++#endif  //#ifndef __native_client__
+     #else
+         #define CV_XADD(addr, delta) __atomic_fetch_add((_Atomic(int)*)(addr), (delta), 5)
+     #endif
+diff -Naur opencv-2.4.7/modules/flann/include/opencv2/flann/allocator.h opencv-2.4.7.nacl/modules/flann/include/opencv2/flann/allocator.h
+--- opencv-2.4.7/modules/flann/include/opencv2/flann/allocator.h        2013-11-06 15:26:39.000000000 +0100
++++ opencv-2.4.7.nacl/modules/flann/include/opencv2/flann/allocator.h   2013-11-19 21:04:57.000000000 +0100
+@@ -68,7 +68,10 @@
+  *
+  */
+ 
++// In NaCl newlib, this variable is declared elsewhere non-const.
++#if defined(__native_client__) && defined(__GLIBC__)
+ const size_t     WORDSIZE=16;
++#endif  //#ifndef __native__client__
+ const  size_t     BLOCKSIZE=8192;
+ 
+ class PooledAllocator
+diff -Naur opencv-2.4.7/modules/legacy/src/calibfilter.cpp opencv-2.4.7.nacl/modules/legacy/src/calibfilter.cpp
+--- opencv-2.4.7/modules/legacy/src/calibfilter.cpp     2013-11-06 15:26:39.000000000 +0100
++++ opencv-2.4.7.nacl/modules/legacy/src/calibfilter.cpp        2013-11-19 21:05:54.000000000 +0100
+@@ -42,7 +42,10 @@
+ #include "precomp.hpp"
+ #include <stdio.h>
+ 
++// NaCl likes this preprocessor definition active, to use a struct field.
++#ifndef __native_client__
+ #undef quad
++#endif  //#ifndef __native_client__
+ 
+ CvCalibFilter::CvCalibFilter()
+ {
+diff -Naur opencv-2.4.7/modules/legacy/src/epilines.cpp opencv-2.4.7.nacl/modules/legacy/src/epilines.cpp
+--- opencv-2.4.7/modules/legacy/src/epilines.cpp        2013-11-06 15:26:39.000000000 +0100
++++ opencv-2.4.7.nacl/modules/legacy/src/epilines.cpp   2013-11-19 21:06:08.000000000 +0100
+@@ -46,7 +46,10 @@
+ 
+ /* Valery Mosyagin */
+ 
++// NaCl likes this preprocessor definition active, to use a struct field.
++#ifndef __native_client__
+ #undef quad
++#endif  //#ifndef __native_client__
+ 
+ #define EPS64D 1e-9
+