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Only add include directories for LLVM, clang & rapidjson if they are not in CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES

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/usr/include/c++/9 comes before /usr/include in `{clang,gcc} -v -fsyntax-only -xc++ /dev/null`.

    target_include_directories(ccls SYSTEM PRIVATE ${RapidJSON_INCLUDE_DIRS})

If ${RapidJSON_INCLUDE_DIRS} resolves to /usr/include, /usr/include will
be shuffled before /usr/include/c++/9 and will cause `#include_next <stdlib.h>`
issues (see https://github.com/MaskRay/ccls/pull/417).

Check if the include directories are already in CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES.
This commit is contained in:
Dan Čermák 2019-06-27 12:19:11 +02:00 committed by Fangrui Song
parent e89e3105b7
commit 0ca7d350cf
1 changed files with 13 additions and 5 deletions
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18
CMakeLists.txt
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@ -143,17 +143,25 @@ set_property(SOURCE src/utils.cc APPEND PROPERTY COMPILE_DEFINITIONS
### Includes
target_include_directories(ccls PRIVATE src)
target_include_directories(ccls SYSTEM PRIVATE
third_party ${LLVM_INCLUDE_DIRS} ${CLANG_INCLUDE_DIRS})
if(USE_SYSTEM_RAPIDJSON)
find_package(RapidJSON QUIET)
endif()
if(NOT RapidJSON_FOUND)
set(RapidJSON_INCLUDE_DIRS third_party/rapidjson/include)
endif()
target_include_directories(ccls SYSTEM PRIVATE ${RapidJSON_INCLUDE_DIRS})
target_include_directories(ccls PRIVATE src)
foreach(include_dir third_party
${LLVM_INCLUDE_DIRS} ${CLANG_INCLUDE_DIRS} ${RapidJSON_INCLUDE_DIRS})
get_filename_component(include_dir_realpath ${include_dir} REALPATH)
# Don't add as SYSTEM if they are in CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES.
# It would reorder the system search paths and cause issues with libstdc++'s
# use of #include_next. See https://github.com/MaskRay/ccls/pull/417
if(NOT "${include_dir_realpath}" IN_LIST CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES)
target_include_directories(ccls SYSTEM PRIVATE ${include_dir})
endif()
endforeach()
### Install