[OSX] Multiple identifiers are undifened plus other erros while files compile okay

[Xiaohong-Deng]

Type: LanguageService

Describe the bug

• OS and Version: OSX Catalina
• VS Code Version: 1.45.1
• C/C++ Extension Version: 0.28.1
• Other extensions you installed (and if the issue persists after disabling them): Project Manager, Python
• Does this issue involve using SSH remote to run the extension on a remote machine?: No
• A clear and concise description of what the bug is, including information about the workspace (i.e. is the workspace a single project or multiple projects, size of the project, etc).

In the "Problems" panel, 72 errors are thrown while the cpp file compiles okay in terminal (depends on the specific complier, some requires minor changes, e.g., 7 variable-sized object errors which are allowed in some compilers). The issue is similar to #743. "C_Cpp.intelliSenseEngine":"Tag Parser" stops linting completely.

Steps to reproduce

My working example is this .cpp file and this .h file. The repo is the single project in VSCode.

My c_cpp_properties.json looks like the following

{
    "configurations": [
        {
            "name": "Mac",
            "includePath": [
                "${workspaceFolder}/**",
                "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/tr1",
                "/usr/local/Cellar/gcc/7.3.0_1/lib/gcc/7/gcc/x86_64-apple-darwin17.3.0/7.3.0/include/ssp",
                "/usr/local/Cellar/postgresql/10.1/include/server/common",
                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include",
                "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include",
                "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0",
                "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/x86_64-apple-darwin17.3.0"
            ],
            "defines": [],
            "macFrameworkPath": [],
            "browse": {
                "path": []
            },
            "compilerPath": "/usr/bin/clang",
            "cStandard": "c11",
            "cppStandard": "c++14",
            "intelliSenseMode": "clang-x86"
        }
    ],
    "version": 4
}

The result can be seen in the "Problems" panel. It can't recognize make_tuple, tie, unordered_map, memcpy and memset while pressing F12 leads to correct definitions.

Expected behavior

This is an OSX specific issue because on Ubuntu 18.04, with

"compilerPath": "/usr/bin/clang",
"cStandard": "c11",
"cppStandard": "c++14",
"intelliSenseMode": "clang-x86"

The errors appear in the "Problems" panel are 7 variable-sized object may not be initialized which are consistent with the error message generated by clang++ -g -O2 -std=c++11 -stdlib=libc++ local_search.cpp -o ls.out in OSX terminal.

Logs

``` -------- Diagnostics - 5/22/2020, 9:23:57 AM Version: 0.28.1 Current Configuration: { "name": "Mac", "includePath": [ "${workspaceFolder}/**", "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/tr1", "/usr/local/Cellar/gcc/7.3.0_1/lib/gcc/7/gcc/x86_64-apple-darwin17.3.0/7.3.0/include/ssp", "/usr/local/Cellar/postgresql/10.1/include/server/common", "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include", "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include", "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0", "/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/x86_64-apple-darwin17.3.0" ], "defines": [], "macFrameworkPath": [], "browse": { "path": [], "limitSymbolsToIncludedHeaders": true }, "compilerPath": "/usr/bin/clang", "cStandard": "c11", "cppStandard": "c++14", "intelliSenseMode": "clang-x86", "compilerArgs": [] } Memory Usage: 106 MB Compiler Path: /usr/bin/clang Includes: /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/tr1 /usr/local/Cellar/gcc/7.3.0_1/lib/gcc/7/gcc/x86_64-apple-darwin17.3.0/7.3.0/include/ssp /usr/local/Cellar/postgresql/10.1/include/server/common /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0 /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/x86_64-apple-darwin17.3.0 /usr/local/include /Library/Developer/CommandLineTools/usr/include/c++/v1 /Library/Developer/CommandLineTools/usr/lib/clang/11.0.3/include /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include /Library/Developer/CommandLineTools/usr/include Frameworks: /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Frameworks Standard Version: c++14 IntelliSense Mode: clang-x86 Other Flags: --clang --clang_version=110003 Total Memory Usage: 106 MB ```

Screenshots

Additional context

[sean-mcmanus]

You should remove the system include paths from your includePath and instead set the compilerPath. Are you trying to compile with gcc 7.3 or clang?

[Xiaohong-Deng]

@sean-mcmanus You are right. I trimmed includePath down to "${workspaceFolder}/**". The other paths were added while I was trying to make it work with gcc and they did eliminate some header file missing errors. Thank you.