cmake: do not search for platform specific unwind

This change removes platform specific unwind lookup allowing the use of
LLVM unwind implementation.

cmake/FindUnwind.cmake

@@ -9,32 +9,7 @@ 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)
+mark_as_advanced (Unwind_INCLUDE_DIR Unwind_LIBRARY)
 
 # Extract version information
 if (Unwind_LIBRARY)
@@ -64,8 +39,10 @@ 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)
+find_package_handle_standard_args (Unwind
+  REQUIRED_VARS Unwind_INCLUDE_DIR Unwind_LIBRARY
+  VERSION_VAR Unwind_VERSION
+)
 
 if (Unwind_FOUND)
   if (NOT TARGET unwind::unwind)
@@ -75,7 +52,7 @@ if (Unwind_FOUND)
       INTERFACE_INCLUDE_DIRECTORIES ${Unwind_INCLUDE_DIR}
     )
     set_property (TARGET unwind::unwind PROPERTY
-      INTERFACE_LINK_LIBRARIES ${Unwind_LIBRARY} ${Unwind_PLATFORM_LIBRARY}
+      INTERFACE_LINK_LIBRARIES ${Unwind_LIBRARY}
     )
     set_property (TARGET unwind::unwind PROPERTY
       IMPORTED_CONFIGURATIONS RELEASE