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Include path search order is generally not preserved by the provider (CDT GCC Built-in Compiler Settings). This breaks the Indexer whenever the search order matters. Example (2 custom include paths added, "tmp" and "chip-1"): ${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}" -Itmp -Ichip-1 => output from gcc, with include path order still clearly preserved: #define __declspec(x) __attribute__((x)) #define __DECIMAL_BID_FORMAT__ 1 #define _REENTRANT 1 tmp chip-1 C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../include/c++/9.2.0 C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../include/c++/9.2.0/x86_64-w64-mingw32 C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../include/c++/9.2.0/backward C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/include C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../include C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/include-fixed C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/include End of search list. => Resulting include path order in eclipse: [...]/mingw64/include [...]/mingw64/include/c++/9.2.0 [...]/mingw64/include/c++/9.2.0/backward [...]/mingw64/include/c++/9.2.0/x86_64-w64-mingw32 [...]/mingw64/lib/gcc/x86_64-w64-mingw32/9.2.0/include [...]/mingw64/lib/gcc/x86_64-w64-mingw32/9.2.0/include-fixed [...]/mingw64/x86_64-w64-mingw32/include [...]/chip-1 [...]/tmp Note how the order of the two custom includes was flipped!
