BuildSystem: Add banan-os cmake platform

toolchain/cmake-platform/banan-os-GNU-ASM.cmake

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+include(Platform/banan-os-GNU)
+__banan_os_compiler_gnu(ASM)

toolchain/cmake-platform/banan-os-GNU-C.cmake

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+include(Platform/banan-os-GNU)
+__banan_os_compiler_gnu(C)

toolchain/cmake-platform/banan-os-GNU-CXX.cmake

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+include(Platform/banan-os-GNU)
+__banan_os_compiler_gnu(CXX)

toolchain/cmake-platform/banan-os-GNU.cmake

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+# This module is shared by multiple languages; use include blocker.
+include_guard()
+
+macro(__banan_os_compiler_gnu lang)
+  set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG "-Wl,-rpath,")
+  set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG_SEP ":")
+  set(CMAKE_SHARED_LIBRARY_RPATH_LINK_${lang}_FLAG "-Wl,-rpath-link,")
+  set(CMAKE_SHARED_LIBRARY_SONAME_${lang}_FLAG "-Wl,-soname,")
+  set(CMAKE_EXE_EXPORTS_${lang}_FLAG "-Wl,--export-dynamic")
+
+  # Initialize link type selection flags.  These flags are used when
+  # building a shared library, shared module, or executable that links
+  # to other libraries to select whether to use the static or shared
+  # versions of the libraries.
+  foreach(type SHARED_LIBRARY SHARED_MODULE EXE)
+    set(CMAKE_${type}_LINK_STATIC_${lang}_FLAGS "-Wl,-Bstatic")
+    set(CMAKE_${type}_LINK_DYNAMIC_${lang}_FLAGS "-Wl,-Bdynamic")
+  endforeach()
+
+endmacro()

toolchain/cmake-platform/banan-os-Initialize.cmake

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+set(BANAN_OS 1)
+set(UNIX 1)

toolchain/cmake-platform/banan-os.cmake

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+set(CMAKE_DL_LIBS "")
+set(CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN "\$ORIGIN")
+set(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
+
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+set(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)
+
+include(Platform/UnixPaths)