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cmake - add warning flags for clang, gcc etc.

--- a/cmake/OpusConfig.cmake

+++ b/cmake/OpusConfig.cmake

@@ -78,3 +78,15 @@

   check_flag(STACK_PROTECTOR -fstack-protector-strong)

   check_flag(HIDDEN_VISIBILITY -fvisibility=hidden)

 endif()

+

+if(NOT MSVC)

+  set(WARNING_LIST -Wall -W -Wstrict-prototypes -Wextra -Wcast-align -Wnested-externs -Wshadow)

+  include(CheckCCompilerFlag)

+  foreach(WARNING_FLAG ${WARNING_LIST})

+    string(REPLACE - "" WARNING_VAR ${WARNING_FLAG})

+    check_c_compiler_flag(${WARNING_FLAG} ${WARNING_VAR}_SUPPORTED)

+    if(${WARNING_VAR}_SUPPORTED)

+      add_compile_options(${WARNING_FLAG})

+    endif()

+  endforeach()

+endif()

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