How do you disable the unused variable warnings coming out of gcc in 3rd party code I do not wish to edit?
c++, compiler-flags, compiler-warnings, gcc
Solution
The `-Wno-unused-variable` switch usually does the trick. However, that is a very useful warning indeed if you care about these things in your project. It becomes annoying when GCC starts to warn you about things not in your code though.
I would recommend you keeping the warning on, but use `-isystem` instead of `-I` for include directories of third-party projects. That flag tells GCC not to warn you about the stuff you have no control over.
For example, instead of `-IC:\\boost_1_52_0`, say `-isystem C:\\boost_1_52_0`.
Problem
I'd like to know what switch you pass to the gcc compiler to turn off unused variable warnings? I'm getting errors out of boost on windows and I do not want to touch the boost code: ``` C:\boost_1_52_0/boost/system/error_code.hpp: At global scope: C:\boost_1_52_0/boost/system/error_code.hpp:214:36: error: 'boost::system::posix_category' defined but not used [-Werror=unused-variable] C:\boost_1_52_0/boost/system/error_code.hpp:215:36: error: 'boost::system::errno_ecat' defined but not used [-Werror=unused-variable] C:\boost_1_52_0/boost/system/error_code.hpp:216:36: error: 'boost::system::native_ecat' defined but not used [-Werror=unused-variable] ``` I tried using both `-Wunused-value` and `-Wno-unused-value` but neither suppressed the messages above. What is the right command, here is my compile line: ``` g++ -g -fno-inline -Wall -Werror -Wextra -Wfloat-equal -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -Wno-conversion -Wdisabled-optimization -Wredundant-decls -Wunused-value -Wno-deprecated -IC:\\boost_1_52_0 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c -o op.o op.cpp ``` Perhaps the `-Wall` overrides my goal?