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?