CMAKE_LANG=CXX
CMAKE_CXX_COMPILER_ABI=ELF
CMAKE_CXX_COMPILER_AR=/usr/bin/gcc-ar-7
CMAKE_CXX_COMPILER_ARCHITECTURE_ID=
CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN=
CMAKE_CXX_COMPILER_ID=GNU
CMAKE_CXX_COMPILER_LAUNCHER=
CMAKE_CXX_COMPILER_LOADED=1
CMAKE_CXX_COMPILER_RANLIB=/usr/bin/gcc-ranlib-7
CMAKE_CXX_COMPILER_TARGET=
CMAKE_CXX_COMPILER_VERSION=7.3.0
CMAKE_CXX_COMPILER_VERSION_INTERAL=

This is a hand-written test case.

#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 ../../../adaptive/relative/include
 /usr/include
End of search list.