renamed and cleaned up the unwind find module

CMakeLists.txt

@@ -117,7 +117,7 @@ check_symbol_exists (snprintf stdio.h HAVE_SNPRINTF)
 
 check_library_exists (dbghelp UnDecorateSymbolName "" HAVE_DBGHELP)
 
-find_package(Libunwind)
+find_package (Unwind)
 
 check_c_source_compiles ("
 #include <stdlib.h>

cmake/FindUnwind.cmake

@@ -0,0 +1,76 @@
+# - Try to find libunwind
+# Once done this will define
+#
+#  Unwind_FOUND - system has libunwind
+#  unwind::unwind - cmake target for libunwind
+
+include (FindPackageHandleStandardArgs)
+
+find_path (Unwind_INCLUDE_DIR NAMES unwind.h libunwind.h DOC "unwind include directory")
+find_library (Unwind_LIBRARY NAMES unwind DOC "unwind library")
+
+if (CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
+    set (Unwind_ARCH "arm")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
+    set (Unwind_ARCH "aarch64")
+elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64" OR
+        CMAKE_SYSTEM_PROCESSOR STREQUAL "corei7-64")
+    set (Unwind_ARCH "x86_64")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^i.86$")
+    set (Unwind_ARCH "x86")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64")
+    set (Unwind_ARCH "ppc64")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc")
+    set (Unwind_ARCH "ppc32")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
+    set (Unwind_ARCH "mips")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^hppa")
+    set (Unwind_ARCH "hppa")
+elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^ia64")
+    set (Unwind_ARCH "ia64")
+endif (CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
+
+find_library (Unwind_PLATFORM_LIBRARY NAMES "unwind-${Unwind_ARCH}"
+  DOC "unwind library platform")
+
+mark_as_advanced (Unwind_INCLUDE_DIR Unwind_LIBRARY Unwind_PLATFORM_LIBRARY)
+
+# Extract version information
+if (Unwind_LIBRARY)
+  set (_Unwind_VERSION_HEADER ${Unwind_INCLUDE_DIR}/libunwind-common.h)
+
+  if (EXISTS ${_Unwind_VERSION_HEADER})
+    FILE (READ ${_Unwind_VERSION_HEADER} _Unwind_VERSION_CONTENTS)
+
+    string (REGEX REPLACE ".*#define UNW_VERSION_MAJOR[ \t]+([0-9]+).*" "\\1"
+      Unwind_VERSION_MAJOR "${_Unwind_VERSION_CONTENTS}")
+    string (REGEX REPLACE ".*#define UNW_VERSION_MINOR[ \t]+([0-9]+).*" "\\1"
+      Unwind_VERSION_MINOR "${_Unwind_VERSION_CONTENTS}")
+    string (REGEX REPLACE ".*#define UNW_VERSION_EXTRA[ \t]+([0-9]+).*" "\\1"
+      Unwind_VERSION_PATCH "${_Unwind_VERSION_CONTENTS}")
+
+    set (Unwind_VERSION
+      ${Unwind_VERSION_MAJOR}.${Unwind_VERSION_MINOR}.${Unwind_VERSION_PATCH})
+    set (Unwind_VERSION_COMPONENTS 3)
+  endif (EXISTS ${_Unwind_VERSION_HEADER})
+endif (Unwind_LIBRARY)
+
+# handle the QUIETLY and REQUIRED arguments and set Unwind_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args (Unwind REQUIRED_VARS Unwind_INCLUDE_DIR
+  Unwind_LIBRARY Unwind_PLATFORM_LIBRARY VERSION_VAR Unwind_VERSION)
+
+if (Unwind_FOUND)
+  add_library (unwind::unwind INTERFACE IMPORTED)
+
+  set_property (TARGET unwind::unwind PROPERTY
+    INTERFACE_INCLUDE_DIRECTORIES ${Unwind_INCLUDE_DIR}
+  )
+  set_property (TARGET unwind::unwind PROPERTY
+    INTERFACE_LINK_LIBRARIES ${Unwind_LIBRARY} ${Unwind_PLATFORM_LIBRARY}
+  )
+  set_property (TARGET unwind::unwind PROPERTY
+    IMPORTED_CONFIGURATIONS RELEASE
+  )
+endif (Unwind_FOUND)