C++ SDL.h file not found

Greetings,

I am using the Clangd extension on VS Code. VS Code reports the following error on my #include <SDL2/SDL.h>.

'SDL2/SDL.h' file not found clang(pp_file_not_found)

Running make results in no errors. Here is my Makefile:

CXXFLAGS = -Wall -Werror -std=c++11
SDL2FLAGS = -lSDL2
execs = chip8emu

all: chip8emu

chip8emu: chip8.cc chip8emu.cc
	$(CXX) $(CXXFLAGS) $(SDL2FLAGS) -o $@ $^

clean:
	rm -f $(execs)

I used bear, as per instructions on the clangd getting started page.

make clean; bear -- make

This results in the following compile_commands.json.

[
  {
    "arguments": [
      "/usr/bin/c++",
      "-c",
      "-Wall",
      "-Werror",
      "-std=c++11",
      "-o",
      "chip8emu",
      "chip8.cc"
    ],
    "directory": "/Users/jasjeet/chip8",
    "file": "/Users/jasjeet/chip8/chip8.cc",
    "output": "/Users/jasjeet/chip8/chip8emu"
  },
  {
    "arguments": [
      "/usr/bin/c++",
      "-c",
      "-Wall",
      "-Werror",
      "-std=c++11",
      "-o",
      "chip8emu",
      "chip8emu.cc"
    ],
    "directory": "/Users/jasjeet/chip8",
    "file": "/Users/jasjeet/chip8/chip8emu.cc",
    "output": "/Users/jasjeet/chip8/chip8emu"
  }
]

However, after restarting VS Code the error is still present. I have also tried adding “-I SDL2” to “arguments”.

System information Clangd extension version v0.1.11 Operating system: MacOS 11.5.2 SDL2 and bear were installed using Homebrew.

Thanks in advance.

[jasrangi]

echo | clang++ -E -v - | grep "/usr/local/include" verified that the output includes that path:

#include <...> search starts here:
 /usr/local/include
 /Library/Developer/CommandLineTools/usr/lib/clang/12.0.5/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
 /Library/Developer/CommandLineTools/usr/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory)
End of search list.

Adding -I /usr/local/include/ to CXXFLAGS in the Makefile, re-generating compile_commands.json by running make clean; bear -- make, and reloading the file in VS Code has cleared the errors. Thank you!

[HighCommander4]

I’m guessing the compiler has /usr/local/include in its default search path (but for some reason clangd does not?)

You can verify this by running echo | clang++ -E -v -: does the output include /usr/local/include?

(As a workaround, adding -I /usr/local/include/ to your CXXFLAGS and re-generating the compile_commands.json should fix the issue.)