当我检查cpp版本时，它向我显示了这条消息：
cpp -v
Using built-in specs.
COLLECT_GCC=cpp
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.3.0-1ubuntu1~16.04.york1' --with-bugurl=file:///usr/share/doc/gcc-
7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++
--prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-
prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-
libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify
--enable-libmpx --enable-plugin --with-system-zlib --with-target-system-
zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-
arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-
multilib --with-tune=generic --enable-offload-targets=nvptx-none
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-1ubuntu1~16.04.york1)
COLLECT_GCC_OPTIONS='-E' '-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/7/cc1 -E -quiet -v -imultiarch x86_64-linux-
gnu - -mtune=generic -march=x86-64 -fstack-protector-strong -Wformat -
Wformat-security
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/include-
fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/../../..
/../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
此消息是错误还是警告？，我能做些什么来解决它？
