compile_commands.json are not getting reloaded on change.

[omicronns]

Type: LanguageService

I can not find a way to reload compile_commands.json file other than restart vscode.

• OS and Version: Linux 4.17.6-1-ARCH
• VS Code Version: 1.25.1
• C/C++ Extension Version: 0.17.7
• Clang Version: 6.0.1

To Reproduce

Take example from #2305 and having everything set up, change in a line in CMakeLists.txt:

add_definitions("-D__weak=__attribute__((weak))" -DABC=\"asd\")

asd to qwe, rebuild, resave c_cpp_properties.json. Hover over ABC in lib.cxx in editor and it still shows asd. Restarting vscode helps with that.

Expected behavior

compile_commands.json being reloaded on change.

Additional context

I tried to debug the extension in order to investigate this issue and #2305 further and I found something interesting:

https://github.com/Microsoft/vscode-cpptools/blob/2cbc90d98b52349ad929e587c250803aee414f6f/Extension/src/LanguageServer/configurations.ts#L482

This conditional (second part fs.existsSync(c.compileCommands)) is not satisfied when compileCommands in c_cpp_properties.json have ${workspaceFolder} in the path. I believe it should not behave like that. Setting path to absolute does not fix reloading issue though.

[sean-mcmanus]

I'm able to repro the problem. Until it's fixed, using the Reload Window command would be the fastest way to get it to update.