Github user calebj commented on the issue:
https://github.com/apache/nifi-minifi-cpp/pull/206
This causes some tests to fail to link on Linux both on Travis CI and
cloud9, both of which are Ubuntu Trusty. Here's the output:
```
[ 19%] Linking CXX executable TestExecuteProcess
libminifi/libminifi.a(ListenHTTP.cpp.o): In function
`org::apache::nifi::minifi::processors::ListenHTTP::WriteCallback::process(std::shared_ptr)':
ListenHTTP.cpp:(.text+0x9e): undefined reference to `mg_read'
ListenHTTP.cpp:(.text+0x10e): undefined reference to `mg_read'
libminifi/libminifi.a(ListenHTTP.cpp.o): In function
`org::apache::nifi::minifi::processors::ListenHTTP::Handler::handlePost(CivetServer*,
mg_connection*)':
ListenHTTP.cpp:(.text+0xd80): undefined reference to `mg_get_request_info'
ListenHTTP.cpp:(.text+0xe50): undefined reference to `mg_printf'
ListenHTTP.cpp:(.text+0x133d): undefined reference to `mg_printf'
ListenHTTP.cpp:(.text+0x14c8): undefined reference to `mg_printf'
ListenHTTP.cpp:(.text+0x1508): undefined reference to `mg_printf'
ListenHTTP.cpp:(.text+0x15a4): undefined reference to `mg_printf'
libminifi/libminifi.a(ListenHTTP.cpp.o):ListenHTTP.cpp:(.text+0x16a6): more
undefined references to `mg_printf' follow
libminifi/libminifi.a(ListenHTTP.cpp.o): In function
`org::apache::nifi::minifi::processors::ListenHTTP::onSchedule(org::apache::nifi::minifi::core::ProcessContext*,
org::apache::nifi::minifi::core::ProcessSessionFactory*)':
ListenHTTP.cpp:(.text+0x254a): undefined reference to
`CivetServer::CivetServer(std::vector
>, CivetCallbacks const*)'
ListenHTTP.cpp:(.text+0x25cb): undefined reference to
`CivetServer::addHandler(std::string const&, CivetHandler*)'
libminifi/libminifi.a(ListenHTTP.cpp.o): In function
`org::apache::nifi::minifi::processors::ListenHTTP::Handler::sendErrorResponse(mg_connection*)':
ListenHTTP.cpp:(.text+0x76b): undefined reference to `mg_printf'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTIN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTIN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x10):
undefined reference to `typeinfo for CivetHandler'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x20):
undefined reference to `CivetHandler::handleGet(CivetServer*, mg_connection*)'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x30):
undefined reference to `CivetHandler::handleHead(CivetServer*, mg_connection*)'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x38):
undefined reference to `CivetHandler::handlePut(CivetServer*, mg_connection*)'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x40):
undefined reference to `CivetHandler::handleDelete(CivetServer*,
mg_connection*)'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x48):
undefined reference to `CivetHandler::handleOptions(CivetServer*,
mg_connection*)'
libminifi/libminifi.a(ListenHTTP.cpp.o):(.rodata._ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE[_ZTVN3org6apache4nifi6minifi10processors10ListenHTTP7HandlerE]+0x50):
undefined reference to `CivetHandler::handlePatch(CivetServer*,
mg_connection*)'
collect2: error: ld returned 1 exit status
make[2]: *** [TestExecuteProcess] Error 1
make[1]: *** [CMakeFiles/TestExecuteProcess.dir/all] Error 2
make: *** [all] Error 2
```
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