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I'm using g++ and it told me that I defined _GNU_SOURCE on the command line, but I didn't. I now that defining _GNU_SOURCE can be used to enable the gnu extension, but now I don't want these extensions. I added -std=c++0x -pedantic , but _GNU_SOURCE is still define. The out put of g++ -v is as follows: $ g++ -v Using built-in specs. COLLECT_GCC=/usr/bin/g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) When I give it an empty file and compile with g++ -E -dD -std=c++98 -pedantic empty.cpp , I get this: $ g++ -E -dD -std=c++98 -pedantic empty.cpp # 1 "empty.cpp" # 1 "<built-in>" #define __STDC__ 1 #define __cplusplus 1 #define __STDC_HOSTED__ 1 #define __GNUC__ 4 #define __GNUC_MINOR__ 6 #define __GNUC_PATCHLEVEL__ 3 #define __VERSION__ "4.6.3" #define __FINITE_MATH_ONLY__ 0 #define _LP64 1 #define __LP64__ 1 #define __SIZEOF_INT__ 4 #define __SIZEOF_LONG__ 8 #define __SIZEOF_LONG_LONG__ 8 #define __SIZEOF_SHORT__ 2 #define __SIZEOF_FLOAT__ 4 #define __SIZEOF_DOUBLE__ 8 #define __S

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