On Fri, Oct 12, 2018 at 6:42 PM David Jobet <djo...@tower-research.com> wrote:
> Hello, > > we embed in our source a copy of an ICC build of LLVM, that we import : > > add_library(global_llvm_external STATIC IMPORTED) > set_property(TARGET global_llvm_external APPEND PROPERTY > INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/icc/include) > set_property(TARGET global_llvm_external APPEND PROPERTY > IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/icc/lib/libLLVMCore.a) > set_property(TARGET global_llvm_external APPEND PROPERTY > INTERFACE_LINK_LIBRARIES > ${CMAKE_CURRENT_SOURCE_DIR}/icc/lib/libLLVMLTO.a ...) > > add_library(global_llvm INTERFACE) > target_link_libraries(global_llvm INTERFACE global_llvm_external) > add_library(global::llvm ALIAS global_llvm) > > It works fine, until someone decided to install a more recent version > of LLVM in its development env. (which is not ABI compatible) > > Somehow, system includes path are looked into first > g++ ... -I/apps/homefs1/USER/work/. -I. -isystem > /spare/local/USER/conda_root/envs/gcc6cxx14/include -isystem > /apps/homefs1/USER/work/.../libllvm/icc/include ... > > so, as with include_directories where it's possible to control the > ordering with BEFORE or AFTER, is there a way to tell cmake that when > linking against global::llvm we want the include directories needed by > global::llvm to be prepended (instead of appended) ? > > While not directly answering your question, what version of CMake are you using? There was a change related to this area in the following merge request that went in for the 3.12 release: https://gitlab.kitware.com/cmake/cmake/merge_requests/1968 The part that got my attention is the following claim in the description: An effect of the -isystem flag is to search the directory after > those specified via -I flags. Which seems at odds with your observations/comments, unless I'm misunderstanding what you're saying. -- Craig Scott Melbourne, Australia https://crascit.com New book released: Professional CMake: A Practical Guide <https://crascit.com/professional-cmake/>
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