Curl

PLCnext Technology & PLCnext Controls
1

dear developer, i am trying to send an email using I assume that i am doing something wrong. by trying to compile the sample code : https://curl.se/libcurl/c/smtp-mail.html It won’t compile giving the folowing error in eclipse: cmd.exe /c ““C:\\Program Files\\PHOENIX CONTACT\\PLCnCLI 2020.0 LTS/plcncli.exe” generate code -p"C:/Users/hybride/eclipse-workspace/Email” -s"src"“cmd.exe /c ““C:\\Program Files\\PHOENIX CONTACT\\PLCnCLI 2020.0 LTS/plcncli.exe” generate code -p"C:/Users/hybride/eclipse-workspace/Email” -s"src”“Generating all files with the ‘code’ generator for C:\\Users\\hybride\\eclipse-workspace\\Email.Successfully generated all files with the ‘code’ generator for C:\\Users\\hybride\\eclipse-workspace\\Email. cmd.exe /c ““C:\\Program Files\\PHOENIX CONTACT\\PLCnCLI 2020.0 LTS/plcncli.exe” generate config -p"C:/Users/hybride/eclipse-workspace/Email” -s"src”"Generating all files with the ‘config’ generator for C:\\Users\\hybride\\eclipse-workspace\\Email.Successfully generated all files with the ‘config’ generator for C:\\Users\\hybride\\eclipse-workspace\\Email.

cmd.exe /c ““C:\\Program Files\\PHOENIX CONTACT\\PLCnCLI 2020.0 LTS/plcncli.exe” build -p"C:/Users/hybride/eclipse-workspace/Email” -b Release"Requested build for targets AXCF2152,20.6.1.30859Starting build for target AXCF2152,20.6.1.30859Checking if CMake needs to be reconfigured…[cmake]: [cmake]: C:\\Users\\hybride\\eclipse-workspace\\Email\\intermediate\\cmake\\AXCF2152,20.6.1.30859\\Release>set PATH=C:\\SDKs\\AXCF2152\\2020.6\\sysroots\\x86_64-pokysdk-mingw32\\usr\\bin;C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\;C:\\Windows\\System32\\OpenSSH\;C:\\Program Files\\PuTTY\;C:\\Users\\hybride\\AppData\\Local\\Microsoft\\WindowsApps; [cmake]: make[1]: Entering directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: make[2]: Entering directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: Scanning dependencies of target Email[cmake]: make[2]: Leaving directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: make[2]: Entering directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: [ 12%] Building CXX object CMakeFiles/Email.dir/intermediate/code/EmailComponentProgramProvider.cpp.o[cmake]: [ 25%] Building CXX object CMakeFiles/Email.dir/intermediate/code/EmailLibrary.meta.cpp.o[cmake]: In file included from C:/SDKs/AXCF2152/2020.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/bits/socket.h:27,[cmake]: from C:/SDKs/AXCF2152/2020.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/sys/socket.h:33,[cmake]: from C:/SDKs/AXCF2152/2020.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/curl/system.h:436,[cmake]: from C:/SDKs/AXCF2152/2020.6/sysroots/cortexa9t2hf-neon-pxc-linux-gnueabi/usr/include/curl/curl.h:38,[cmake]: from C:/Users/hybride/eclipse-workspace/Email/src/EmailProgram.hpp:8,[cmake]: from C:/Users/hybride/eclipse-workspace/Email/intermediate/code/EmailLibrary.meta.cpp:3:[cmake]: C:/Users/hybride/eclipse-workspace/Email/intermediate/code/EmailLibrary.meta.cpp: In member function ‘void Email::EmailLibrary::InitializeTypeDomain()’:[cmake]: C:/Users/hybride/eclipse-workspace/Email/intermediate/code/EmailLibrary.meta.cpp:21:44: warning: offsetof within non-standard-layout type ‘Email::EmailProgram’ is conditionally-supported [-Winvalid-offsetof][cmake]: 21 | { “send”, offsetof(::email::EmailProgram, send_mail), DataType::Boolean, “”, sizeof(boolean), alignof(boolean), { }, StandardAttribute::Input },[cmake]: | [1]: C:/Users/hybride/eclipse-workspace/Email/intermediate/code/EmailLibrary.meta.cpp:22:47: warning: offsetof within non-standard-layout type ‘Email::EmailProgram’ is conditionally-supported [-Winvalid-offsetof][cmake]: 22 | { “message”, offsetof(::email::EmailProgram, function_answer), DataType::StaticString, “”, sizeof(StaticString<80>), alignof(StaticString<80>), { }, StandardAttribute::Output },[cmake]: | [2]: C:/Users/hybride/eclipse-workspace/Email/intermediate/code/EmailLibrary.meta.cpp:23:46: warning: offsetof within non-standard-layout type ‘Email::EmailProgram’ is conditionally-supported [-Winvalid-offsetof][cmake]: 23 | { “places”, offsetof(::email::EmailProgram, place), DataType::Boolean | DataType::Array, “”, sizeof(boolean), alignof(boolean), { 50 }, StandardAttribute::Output },[cmake]: | [3]: [ 37%] Building CXX object CMakeFiles/Email.dir/src/EmailProgram.cpp.o[cmake]: [ 50%] Linking CXX shared library libEmail.so[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: CMakeFiles/Email.dir/src/EmailProgram.cpp.o: in function Email::EmailProgram::Execute()':[cmake]: EmailProgram.cpp:(.text+0x12): undefined reference to curl_easy_init’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x2a): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x36): undefined reference to curl_easy_setopt’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x44): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x4e): undefined reference to curl_easy_setopt’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x5c): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: CMakeFiles/Email.dir/src/EmailProgram.cpp.o:EmailProgram.cpp:(.text+0x68): more undefined references to curl_easy_setopt’ follow[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: CMakeFiles/Email.dir/src/EmailProgram.cpp.o: in function Email::EmailProgram::Execute()':[cmake]: EmailProgram.cpp:(.text+0x70): undefined reference to curl_slist_append’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x7e): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x8c): undefined reference to curl_easy_setopt’[cmake]: make[2]: Leaving directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0x98): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xa2): undefined reference to curl_easy_setopt’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xac): undefined reference to curl_easy_setopt'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xb2): undefined reference to curl_easy_perform’[cmake]: make[1]: Leaving directory ‘C:/Users/hybride/eclipse-workspace/Email/intermediate/cmake/AXCF2152,20.6.1.30859/Release’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xba): undefined reference to curl_slist_free_all'[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xc0): undefined reference to curl_easy_cleanup’[cmake]: c:/sdks/axcf2152/2020.6/sysroots/x86_64-pokysdk-mingw32/usr/bin/arm-pxc-linux-gnueabi/../../libexec/arm-pxc-linux-gnueabi/gcc/arm-pxc-linux-gnueabi/9.3.0/real-ld.exe: EmailProgram.cpp:(.text+0xd8): undefined reference to `curl_easy_strerror’[cmake]: collect2.exe: error: ld returned 1 exit status[cmake]: make[2]: *** [CMakeFiles/Email.dir/build.make:182: libEmail.so] Error 1[cmake]: make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/Email.dir/all] Error 2[cmake]: make: *** [Makefile:130: all] Error 2cmake process exited with error what is causing the undefined refference? Does it need cross compilation for eclipse (because of the limited ‘standard’ librari of curl) or What am I doing wrong? thanks in advance kind regards Nick

  1. cmake ↩︎

  2. cmake ↩︎

  3. cmake ↩︎

2

Hello Nick,

Did you modify the CMakeLists.txt to look for the new curl and setup linking?

1. Add Curl to your linked libraries in CmakeLists.txt (you probably need libcurl.so)
2. Build Plcnext project in eclipse

Check that the libcurl in the SDK also supports the feature you want to use.
SMTP is not build into the Curl lib that is included so you will need to rebuild Curl as well..
[
Something Like this For Crosscompiling:

git clone GitHub - curl/curl: A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features · GitHub](GitHub - curl/curl: A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features · GitHub)

cd curl
git checkout tags/curl-7_69_1 source /opt/pxc/2152/2020.6/environment-setup-cortexa9t2hf-neon-pxc-linux-gnueabi
. /opt/pxc/2152/2020.6/site-config-cortexa9t2hf-neon-pxc-linux-gnueabi

mkdir install
./buildconf
./configure $CONFIGURE_FLAGS --enable-smtp --prefix=“$(pwd)/install” ’ --disable-Allthat you dont realy need
make
make install

ls -la

kind regards,
Oliver