--- poppler-0.78.0/cmake/modules/PopplerMacros.cmake
+++ poppler-0.78.0/cmake/modules/PopplerMacros.cmake
@@ -145,28 +145,6 @@
   endif(GCC_HAS_AS_NEEDED)
 endif (CMAKE_COMPILER_IS_GNUCXX)
 
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-# set the default compile warnings
-  set(_warn "-Wall -Wextra -Wpedantic")
-  set(_warn "${_warn} -Wno-unused-parameter")
-  set(_warn "${_warn} -Wcast-align")
-  set(_warn "${_warn} -Wformat-security")
-  set(_warn "${_warn} -Wframe-larger-than=65536")
-  set(_warn "${_warn} -Wmissing-format-attribute")
-  set(_warn "${_warn} -Wnon-virtual-dtor")
-  set(_warn "${_warn} -Woverloaded-virtual")
-  set(_warn "${_warn} -Wmissing-declarations")
-  set(_warn "${_warn} -Wundef")
-  set(_warn "${_warn} -Wzero-as-null-pointer-constant")
-  set(_warn "${_warn} -Wshadow")
-
-  # set extra warnings
-  set(_warnx "${_warnx} -Wconversion")
-
-  set(DEFAULT_COMPILE_WARNINGS "${_warn}")
-  set(DEFAULT_COMPILE_WARNINGS_EXTRA "${_warn} ${_warnx}")
-endif()
-
 if(CMAKE_C_COMPILER MATCHES "icc")
   set(_save_cxxflags "${CMAKE_CXX_FLAGS}")
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g ${_save_cxxflags}")