Preprocess fails

[myrgy]

Hi,

When I'm trying to use pre-process, I'm getting this error:

// Generated by: /opt/gcc8/bin/g++ -I/home/user/Workspace/test/src/utils/include -I/home/user/Workspace/test/src/utils/include/utils -I/home/user/Workspace/test/src/core/include -I/home/user/Workspace/test/src/core/include/core -I/home/user/Workspace/test/src/core/include/core/v1 -I/home/user/Workspace/test/src/ttt/include -I/home/user/Workspace/test/include -I/home/user/Workspace/test/src -I/home/user/Workspace/test/vendor/spdlog/include/spdlog/fmt -I/home/user/Workspace/test/vendor/spdlog/include -I/home/user/Workspace/test/vendor/json/. -I/home/user/Workspace/test/vendor/MPMCQueue/include -I/home/user/Workspace/test/build/src/ttt/cboe -I/home/user/Workspace/test/vendor/HashMap/include -I/home/user/Workspace/test/vendor/CharConv/include -g -std=c++1z -fvisibility=hidden -Wall -Wextra -Wpedantic -Wno-unused-parameter -g -Werror -fPIC -c /home/user/Workspace/test/src/ttt/src/CFEBOEGateway.cpp -resource-dir=/home/user/Projects/ccls/Release/clang+llvm-6.0.1-x86_64-linux-gnu-ubuntu-16.04/lib/clang/6.0.1 -working-directory=/home/user/Workspace/test/build/src/ttt -Wno-unknown-warning-optiong++: error: unrecognized command line option ‘-resource-dir=/home/user/Projects/ccls/Release/clang+llvm-6.0.1-x86_64-linux-gnu-ubuntu-16.04/lib/clang/6.0.1’
g++: error: unrecognized command line option ‘-working-directory=/home/user/Workspace/test/build/src/ttt’

I assume that issue is caused by fact, that I use gcc, while ccls convert compile_commands to clang.
I think it might be great to have ability to fetch original compile command and use it to perform preprocessing.

Thank you in advance!

[MaskRay]

-working-directory and -resource-dir are clang-specific options not known to GCC. When the first argument (compiler driver) is gcc, there might be some unavoidable processing to make up a runnable command line, but I'm not sure how this should be done.

[myrgy]

I think there are 2 options - use gcc with original command line or perform call using clang, embedded into ccls.
UPD: here is rtags solution: https://github.com/Andersbakken/rtags/blob/4747d5b695bee40c3b0a2e3591ac8897571edd66/src/Preprocessor.cpp

[MaskRay]

This may be a somewhat ugly solution:

(nbutlast (gethash "args" (ccls-file-info)) 3)

But -working-directory= is also important. It gives the "directory": ... information.

[myrgy]

Better than nothing! will give a try! Thanks!

[MaskRay]

Since this can be easily fixed I am closing this