Error building in macOS

[yjaek]

I am using macOS High Sierra Version 10.13.3, and I receive the following error.

Yongs-MacBook-Pro:~ yongjae$ cd casablanca/
Yongs-MacBook-Pro:casablanca yongjae$ mkdir build.release
Yongs-MacBook-Pro:casablanca yongjae$ cd build.release/
Yongs-MacBook-Pro:build.release yongjae$ cmake ../Release -DCMAKE_BUILD_TYPE=Release
-- The C compiler identification is AppleClang 9.1.0.9020039
-- The CXX compiler identification is AppleClang 9.1.0.9020039
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE
-- Looking for include file xlocale.h
-- Looking for include file xlocale.h - found
-- Setting clang options
-- websocketpp not found, using the embedded version
-- Boost version: 1.67.0
-- Found the following Boost libraries:
-- random
-- system
-- thread
-- filesystem
-- chrono
-- atomic
-- date_time
-- regex
-- Found OpenSSL: /usr/local/lib/libcrypto.dylib (found suitable version "1.1.1", minimum required is "1.0.0")
-- Performing Test _SSL_LEAK_SUPPRESS_AVAILABLE
-- Performing Test _SSL_LEAK_SUPPRESS_AVAILABLE - Failed
-- Found ZLIB: /usr/lib/libz.dylib (found version "1.2.11")
-- Added test library httpclient_test
-- Added test library httplistener_test
-- Added test library json_test
-- Added test library pplx_test
-- Added test library streams_test
-- Added test library uri_test
-- Added test library utils_test
-- Added test library websocketsclient_test
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/yongjae/casablanca/build.release
Yongs-MacBook-Pro:build.release yongjae$ make -j 4
Scanning dependencies of target cpprest
[ 1%] Building CXX object src/CMakeFiles/cpprest.dir/http/client/http_client.cpp.o
[ 1%] Building CXX object src/CMakeFiles/cpprest.dir/http/client/http_client_msg.cpp.o
[ 2%] Building CXX object src/CMakeFiles/cpprest.dir/http/client/x509_cert_utilities.cpp.o
[ 2%] Building CXX object src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o
[ 3%] Building CXX object src/CMakeFiles/cpprest.dir/http/common/http_msg.cpp.o
[ 3%] Building CXX object src/CMakeFiles/cpprest.dir/http/listener/http_listener.cpp.o
[ 4%] Building CXX object src/CMakeFiles/cpprest.dir/http/listener/http_listener_msg.cpp.o
[ 4%] Building CXX object src/CMakeFiles/cpprest.dir/http/listener/http_server_api.cpp.o
[ 5%] Building CXX object src/CMakeFiles/cpprest.dir/http/oauth/oauth1.cpp.o
[ 6%] Building CXX object src/CMakeFiles/cpprest.dir/http/oauth/oauth2.cpp.o
[ 6%] Building CXX object src/CMakeFiles/cpprest.dir/json/json.cpp.o
[ 7%] Building CXX object src/CMakeFiles/cpprest.dir/json/json_parsing.cpp.o
[ 7%] Building CXX object src/CMakeFiles/cpprest.dir/json/json_serialization.cpp.o
[ 8%] Building CXX object src/CMakeFiles/cpprest.dir/pplx/pplx.cpp.o
[ 9%] Building CXX object src/CMakeFiles/cpprest.dir/uri/uri.cpp.o
[ 9%] Building CXX object src/CMakeFiles/cpprest.dir/uri/uri_builder.cpp.o
[ 10%] Building CXX object src/CMakeFiles/cpprest.dir/utilities/asyncrt_utils.cpp.o
[ 10%] Building CXX object src/CMakeFiles/cpprest.dir/utilities/base64.cpp.o
[ 11%] Building CXX object src/CMakeFiles/cpprest.dir/utilities/web_utilities.cpp.o
[ 12%] Building CXX object src/CMakeFiles/cpprest.dir/websockets/client/ws_msg.cpp.o
[ 12%] Building CXX object src/CMakeFiles/cpprest.dir/websockets/client/ws_client.cpp.o
[ 13%] Building CXX object src/CMakeFiles/cpprest.dir/websockets/client/ws_client_wspp.cpp.o
[ 13%] Building CXX object src/CMakeFiles/cpprest.dir/pplx/pplxapple.cpp.o
[ 14%] Building CXX object src/CMakeFiles/cpprest.dir/pplx/threadpool.cpp.o
[ 15%] Building CXX object src/CMakeFiles/cpprest.dir/http/client/http_client_asio.cpp.o
[ 15%] Building CXX object src/CMakeFiles/cpprest.dir/streams/fileio_posix.cpp.o
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:654:76: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
auto start_http_request_flow = [proxy_type, proxy_host, proxy_port AND_CAPTURE_MEMBER_FUNCTION_POINTER...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1044:120: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
...+ http::details::chunked_encoding::data_offset, chunkSize).then([this_request, buf, chunkSize AND_CAPTURE_MEMB...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1101:118: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
...*>(m_body_buf.prepare(readSize)), readSize).then([this_request AND_CAPTURE_MEMBER_FUNCTION_POINTERS](pplx::tas...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1404:79: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
.then([this_request, to_read, shared_decompressed AND_CAPTURE_MEMBER_FUNCTION_POIN...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1422:144: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
...uint8_t *>(m_body_buf.data()), to_read).then([this_request, to_read AND_CAPTURE_MEMBER_FUNCTION_POINTERS](pplx...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1519:77: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
.then([this_request, read_size, shared_decompressed AND_CAPTURE_MEMBER_FUNCTION_POINTE...
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1541:37: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
.then([this_request AND_CAPTURE_MEMBER_FUNCTION_POINTERS](pplx::task<size_t> op)
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1592:37: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
m_timer.async_wait([ctx AND_CAPTURE_MEMBER_FUNCTION_POINTERS](const boost::system::error_code& ec)
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:1607:41: error: lambda capture 'this' is not
used [-Werror,-Wunused-lambda-capture]
m_timer.async_wait([ctx AND_CAPTURE_MEMBER_FUNCTION_POINTERS](const boost::system::error_code& ec)
^
/Users/yongjae/casablanca/Release/src/http/client/http_client_asio.cpp:59:48: note: expanded from macro
'AND_CAPTURE_MEMBER_FUNCTION_POINTERS'
#define AND_CAPTURE_MEMBER_FUNCTION_POINTERS , this
^
[ 16%] Building CXX object src/CMakeFiles/cpprest.dir/http/listener/http_server_asio.cpp.o
9 errors generated.
make[2]: *** [src/CMakeFiles/cpprest.dir/http/client/http_client_asio.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [src/CMakeFiles/cpprest.dir/all] Error 2
make: *** [all] Error 2

Would someone help me resolve this issue?

[allfii]

I got exactly the same issue with you on OS X. I think those error messages "'this' is not used" should not be an error but actually just a warning. I think this may be safely ignored by doing work around with -DWERROR=OFF and passing it to the cmake configure as additional argument.

[garethsb]

AND_CAPTURE_MEMBER_FUNCTION_POINTERS is a workaround for some compilers. It looks like it's being used unnecessarily in your environment and thus generating a warning. If you set WERROR to 0 when calling CMake at least that warning won't be treated as an error.

[yjaek]

Thank you, @masphei and @garethsb-sony. My issue is resolved.