--- poppler-0.82.0/cmake/modules/PopplerMacros.cmake
+++ poppler-0.82.0/cmake/modules/PopplerMacros.cmake
@@ -145,46 +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} ${_warnx}")
-
-  set(_save_cxxflags "${CMAKE_CXX_FLAGS}")
-  set(CMAKE_CXX_FLAGS                "-fno-exceptions -fno-check-new -fno-common -D_DEFAULT_SOURCE")
-  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g ${_save_cxxflags}")
-  set(CMAKE_CXX_FLAGS_RELEASE        "-O2 -DNDEBUG ${_save_cxxflags}")
-  # clang does not support -fno-reorder-blocks -fno-schedule-insns, so do not use -O2
-  set(CMAKE_CXX_FLAGS_DEBUG          "-g ${_save_cxxflags}")
-  set(CMAKE_CXX_FLAGS_DEBUGFULL      "-g3 -fno-inline ${_save_cxxflags}")
-  set(CMAKE_CXX_FLAGS_PROFILE        "-g3 -fno-inline -ftest-coverage -fprofile-arcs ${_save_cxxflags}")
-  set(_save_cflags "${CMAKE_C_FLAGS}")
-  set(CMAKE_C_FLAGS                  "-std=c99 -D_DEFAULT_SOURCE")
-  set(CMAKE_C_FLAGS_RELWITHDEBINFO   "-O2 -g ${_save_cflags}")
-  set(CMAKE_C_FLAGS_RELEASE          "-O2 -DNDEBUG ${_save_cflags}")
-  # clang does not support -fno-reorder-blocks -fno-schedule-insns, so do not use -O2
-  set(CMAKE_C_FLAGS_DEBUG            "-g ${_save_cflags}")
-  set(CMAKE_C_FLAGS_DEBUGFULL        "-g3 -fno-inline ${_save_cflags}")
-  set(CMAKE_C_FLAGS_PROFILE          "-g3 -fno-inline -ftest-coverage -fprofile-arcs ${_save_cflags}")
-
-endif()
-
 if(CMAKE_C_COMPILER MATCHES "icc")
   set(_save_cxxflags "${CMAKE_CXX_FLAGS}")
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g ${_save_cxxflags}")