CMAKE_CXX_STANDARD in SystemC-2.3.2 build System Enables Nonstandard C++11 Switch

[sumit_tuwien]

Hello All,

cmake ../ -DCMAKE_CXX_STANDARD=11 enables gcc specific switch -std=gnu++11 and "not" standard -std=c++11

And this is creating some side effects:

When I try to use clang: 

cmake ../ -DCMAKE_CXX_STANDARD=11 -DCMAKE_INSTALL_PREFIX=/home/sumit/systemc-2.3.2/ -DBUILD_SOURCE_DOCUMENTATION=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++

I see -std=c++11 option is not enabled during compilation:

............................................

[  9%] Building CXX object src/CMakeFiles/systemc.dir/sysc/communication/sc_signal_ports.cpp.o
cd /home/sumit/install/systemc-2.3.2/objdir/src && /usr/bin/clang++   -DSC_BUILD -DSC_ENABLE_ASSERTIONS -DSC_ENABLE_EARLY_MAXTIME_CREATION -DSC_ENABLE_SIMULATION_PHASE_CALLBACKS_TRACING -DSC_INCLUDE_FX -I/home/sumit/install/systemc-2.3.2/src  -O3 -DNDEBUG   -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -pthread -o CMakeFiles/systemc.dir/sysc/communication/sc_signal_ports.cpp.o -c /home/sumit/install/systemc-2.3.2/src/sysc/communication/sc_signal_ports.cpp
[  9%] Building CXX object src/CMakeFiles/systemc.dir/sysc/communication/sc_signal_resolved.cpp.o
cd /home/sumit/install/systemc-2.3.2/objdir/src && /usr/bin/clang++   -DSC_BUILD -DSC_ENABLE_ASSERTIONS -DSC_ENABLE_EARLY_MAXTIME_CREATION -DSC_ENABLE_SIMULATION_PHASE_CALLBACKS_TRACING -DSC_INCLUDE_FX -I/home/sumit/install/systemc-2.3.2/src  -O3 -DNDEBUG   -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -pthread -o CMakeFiles/systemc.dir/sysc/communication/sc_signal_resolved.cpp.o -c /home/sumit/install/systemc-2.3.2/src/sysc/communication/sc_signal_resolved.cpp
[  9%] Building CXX object src/CMakeFiles/systemc.dir/sysc/communication/sc_signal_resolved_ports.cpp.o
cd /home/sumit/install/systemc-2.3.2/objdir/src && /usr/bin/clang++   -DSC_BUILD -DSC_ENABLE_ASSERTIONS -DSC_ENABLE_EARLY_MAXTIME_CREATION -DSC_ENABLE_SIMULATION_PHASE_CALLBACKS_TRACING -DSC_INCLUDE_FX -I/home/sumit/install/systemc-2.3.2/src  -O3 -DNDEBUG   -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable -pthread -o CMakeFiles/systemc.dir/sysc/communication/sc_signal_resolved_ports.cpp.o -c /home/sumit/install/systemc-2.3.2/src/sysc/communication/sc_signal_resolved_ports.cpp
..........

Regards,

Sumit

[AmeyaVS]

Hello @sumit_tuwien,

You can turn off the G++ extensions using the CMake command-line option:

# Enable C++11 compilation flag
# -DCMAKE_CXX_STANDARD=11
# Disable C++ Compiler Extensions
# -DCMAKE_CXX_EXTENSIONS=OFF
cmake -DCMAKE_CXX_STANDARD=11 -DCMAKE_CXX_EXTENSIONS=OFF -DCMAKE_INSTALL_PREFIX=<Path to install location> ..

You can find a reference here.

Can you also list the version and platform information of the tools you are using (clang, CMake, etc.)?

Hope it helps.

Regards,

Ameya Vikram Singh

[sumit_tuwien]

Hello Ameya,

Thanks for the help.

Regards,

Sumit