Issue

I was trying to build OSRM project for GSoC following the Wiki Instructions on MacOS Version 13.2.1. The build fails with error every time I try to build:

error: variable 'block_counter' set but not used [-Werror,-Wunused-but-set-variable]
        unsigned block_counter = 0;

Possible Solution

From doing a quick search, I think commenting out or removing the unused variable from the following location, osrm-backend/include/util/range_table.hpp:82:18, might fix this issue? Following the call-back history:

• osrm-backend/src/extractor/edge_based_graph_factory.cpp:4
• osrm-backend/include/extractor/files.hpp:8
• osrm-backend/include/extractor/serialization.hpp:6
• osrm-backend/include/extractor/intersection_bearings_container.hpp:8
• osrm-backend/include/util/range_table.hpp:82:18

Better possible solution proposed in comment directly below this post.

Steps to reproduce

• Download OSRM project using git clone

• Following Wiki instructions:

  cd osrm-backend
  
  mkdir -p build
  cd build
  cmake .. -DCMAKE_BUILD_TYPE=Release
  cmake --build .
  cmake --build . --target install

• On the cmake .. -DCMAKE_BUILD_TYPE=Release step, the following Tests/Flags fail or are deprecated/unsuported:

  ♥ ➜ cmake .. -DCMAKE_BUILD_TYPE=Release
  CMake Deprecation Warning at CMakeLists.txt:53 (cmake_policy):
     The OLD behavior for policy CMP0048 will be removed from a future version
     of CMake.
     
     The cmake-policies(7) manual explains that the OLD behaviors of all
     policies are deprecated and that a policy should be set to OLD only under
     specific short-term circumstances.  Projects should be ported to the NEW
     behavior and not rely on setting a policy to OLD.
  
  -- The C compiler identification is AppleClang 14.0.3.14030022
  -- The CXX compiler identification is AppleClang 14.0.3.14030022
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  
  [... Skipping Successful Portions to Save Space ...]
  
  -- Performing Test SUPPORTS_CXXFLAG_duplicated_cond
  -- Performing Test SUPPORTS_CXXFLAG_duplicated_cond - Failed
  -- Performing Test SUPPORTS_CFLAG_duplicated_cond
  -- Performing Test SUPPORTS_CFLAG_duplicated_cond - Failed
  -- Flag -Wduplicated-cond is unsupported
  -- Flag -Wduplicated-cond is unsupported
  
  [... Skipping Successful Portions to Save Space ...]
  
  -- Performing Test SUPPORTS_CXXFLAG_bool_compare
  -- Performing Test SUPPORTS_CXXFLAG_bool_compare - Failed
  -- Performing Test SUPPORTS_CFLAG_bool_compare
  -- Performing Test SUPPORTS_CFLAG_bool_compare - Failed
  -- Flag -Wbool-compare is unsupported
  -- Flag -Wbool-compare is unsupported
  
  [... Skipping Successful Portions to Save Space ...]
  
  -- Performing Test SUPPORTS_CXXFLAG_logical_op
  -- Performing Test SUPPORTS_CXXFLAG_logical_op - Failed
  -- Performing Test SUPPORTS_CFLAG_logical_op
  -- Performing Test SUPPORTS_CFLAG_logical_op - Failed
  -- Flag -Wlogical-op is unsupported
  -- Flag -Wlogical-op is unsupported
  -- Performing Test SUPPORTS_CXXFLAG_maybe_uninitialized
  -- Performing Test SUPPORTS_CXXFLAG_maybe_uninitialized - Failed
  -- Performing Test SUPPORTS_CFLAG_maybe_uninitialized
  -- Performing Test SUPPORTS_CFLAG_maybe_uninitialized - Failed
  -- Flag -Wmaybe-uninitialized is unsupported
  -- Flag -Wmaybe-uninitialized is unsupported
  
  [... Skipping Successful Portions to Save Space ...]
  
  -- Performing Test SUPPORTS_CXXFLAG_no_return_local_addr
  -- Performing Test SUPPORTS_CXXFLAG_no_return_local_addr - Failed
  -- Performing Test SUPPORTS_CFLAG_no_return_local_addr
  -- Performing Test SUPPORTS_CFLAG_no_return_local_addr - Failed
  -- Flag -Wno-return-local-addr is unsupported
  -- Flag -Wno-return-local-addr is unsupported
  
  [... Skipping Successful Portions to Save Space ...]
  
  -- Performing Test SUPPORTS_CXXFLAG_trampolines
  -- Performing Test SUPPORTS_CXXFLAG_trampolines - Failed
  -- Performing Test SUPPORTS_CFLAG_trampolines
  -- Performing Test SUPPORTS_CFLAG_trampolines - Failed
  -- Flag -Wtrampolines is unsupported
  -- Flag -Wtrampolines is unsupported
  
  [... Skipping Successful Portions to Save Space ...]
  
  CMake Deprecation Warning at third_party/flatbuffers/CMakeLists.txt:1 (cmake_minimum_required):
     Compatibility with CMake < 2.8.12 will be removed from a future version of
     CMake.
     
     Update the VERSION argument <min> value or use a ...<max> suffix to tell
     CMake that the project does not need compatibility with older versions.
  
  -- Looking for strtof_l
  -- Looking for strtof_l - not found
  -- Looking for strtoull_l
  -- Looking for strtoull_l - not found

  All other tests in this phase completed Successfully.

• On the cmake --build . step, the results looks like this:

  ♥ ➜ cmake --build .
  [  0%] Building CXX object CMakeFiles/UTIL.dir/src/util/assert.cpp.o
  [  0%] Building CXX object CMakeFiles/UTIL.dir/src/util/conditional_restrictions.cpp.o
  [  0%] Building CXX object CMakeFiles/UTIL.dir/src/util/coordinate.cpp.o
  [  0%] Building CXX object CMakeFiles/UTIL.dir/src/util/coordinate_calculation.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/exception.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/fingerprint.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/geojson_debug_policies.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/guidance/bearing_class.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/guidance/entry_class.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/guidance/turn_lanes.cpp.o
  [  4%] Building CXX object CMakeFiles/UTIL.dir/src/util/log.cpp.o
  [  8%] Building CXX object CMakeFiles/UTIL.dir/src/util/opening_hours.cpp.o
  [  8%] Building CXX object CMakeFiles/UTIL.dir/src/util/timed_histogram.cpp.o
  [  8%] Building CXX object CMakeFiles/UTIL.dir/src/util/timezones.cpp.o
  [  8%] Built target UTIL
  [ 13%] Building CXX object CMakeFiles/EXTRACTOR.dir/src/extractor/compressed_edge_container.cpp.o
  [ 13%] Building CXX object CMakeFiles/EXTRACTOR.dir/src/extractor/edge_based_graph_factory.cpp.o
  In file included from /Users/altimofeyev/Documents/Programming/GitHub/osrm-backend/src/extractor/edge_based_graph_factory.cpp:4:
  In file included from /Users/altimofeyev/Documents/Programming/GitHub/osrm-backend/include/extractor/files.hpp:8:
  In file included from /Users/altimofeyev/Documents/Programming/GitHub/osrm-backend/include/extractor/serialization.hpp:6:
  In file included from /Users/altimofeyev/Documents/Programming/GitHub/osrm-backend/include/extractor/intersection_bearings_container.hpp:8:
  /Users/altimofeyev/Documents/Programming/GitHub/osrm-backend/include/util/range_table.hpp:82:18: error: variable 'block_counter' set but not used [-Werror,-Wunused-but-set-variable]
       unsigned block_counter = 0;
                ^
  1 error generated.
  make[2]: *** [CMakeFiles/EXTRACTOR.dir/src/extractor/edge_based_graph_factory.cpp.o] Error 1
  make[1]: *** [CMakeFiles/EXTRACTOR.dir/all] Error 2
  make: *** [all] Error 2

Specifications

Development Environment.

• MacOS 13.2.1
• Homebrew installed these packages following wiki instructions:

  brew install boost git cmake libzip libxml2 lua tbb ccache GDAL

• gcc-12/g++-12 already installed for c++ compiler.

Similar Issue

I found a couple similar issues related to building OSRM on MacOS:

• Mac install instructions out of date #6549
• [Build Issue] Linker error while trying to build osrm on Mac M1 #6566