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cmake_minimum_required (VERSION 3.14)
project(IncludeDirectoriesCPATH CXX)
message(STATUS "ENV{CPATH}: '$ENV{CPATH}'")
message(STATUS "CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES: '${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}'")
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag(-Wunused-variable run_sys_includes_test)
if(run_sys_includes_test)
# The Bullseye wrapper appears to break the -isystem effect.
execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE out ERROR_VARIABLE out)
if("x${out}" MATCHES "Bullseye")
set(run_sys_includes_test 0)
endif()
endif()
if (NOT run_sys_includes_test)
return()
endif()
add_library(consumer consumer.cpp)
add_library(consumer_system consumer.cpp)
target_compile_options(consumer_system PRIVATE -Werror=unused-variable)
target_include_directories(consumer_system SYSTEM PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/viacpath")
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