std::filesystem does not appear in intellisense when in usage with boost-ext/ut.hpp

[celonymire]

Type: LanguageService

Describe the bug

• OS and Version: Windows 10
• VS Code Version: 1.54.1
• C/C++ Extension Version: 1.2.2
• Other extensions you installed (and if the issue persists after disabling them):
• Does this issue involve using SSH remote to run the extension on a remote machine?: Yes (I'm using WSL 2)
• 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).

When including boost-ext/ut.hpp BEFORE including <filesystem>, it will NOT recognize the existence of std::filesystem namespace. It works if I include boost-ext/ut.hpp AFTER including <filesystem> .

boost-ext/ut.hpp is a third-party micro unit testing library by Boost, and you can get their header ut.hpp in the path include/boost: https://github.com/boost-ext/ut

Steps to reproduce

1. Download ut.hpp from here: https://github.com/boost-ext/ut/blob/master/include/boost/ut.hpp
2. Put ut.hpp in the same directory as .cpp file
3. Edit C++ configuration with C/C++: Edit Configurations (UI)
4. Set C++ Standard to C++20 (ut.hpp requires C++20)
5. Type in the following code in any .cpp file:

#include "ut.hpp"
#include <filesystem>

std::filesystem::path;

6. See error

Expected behavior

std::filesystem should be recognized as an existing namespace.

Logs

-------- Diagnostics - 3/10/2021, 6:00:13 PM
Version: 1.2.2
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/clang",
    "cStandard": "c11",
    "cppStandard": "c++20",
    "intelliSenseMode": "linux-clang-x64",
    "configurationProvider": "ms-vscode.cmake-tools",
    "compilerArgs": [],
    "intelliSenseModeIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "compilerPathIsExplicit": true,
    "browse": {
        "path": [
            "${workspaceFolder}/**"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Translation Unit Mappings:
[ /home/sames/Projects/sandbox/main.cpp ]:
    /home/sames/Projects/sandbox/ut.hpp
Translation Unit Configurations:
[ /home/sames/Projects/sandbox/main.cpp ]:
    Process ID: 10566
    Memory Usage: 157 MB
    Compiler Path: /usr/bin/clang
    Includes:
        /usr/include/c++/10
        /usr/include/x86_64-linux-gnu/c++/10
        /usr/include/c++/10/backward
        /usr/local/include
        /usr/lib/llvm-10/lib/clang/10.0.0/include
        /usr/include/x86_64-linux-gnu
        /usr/include
        /home/sames/Projects/sandbox
    Standard Version: c++20
    IntelliSense Mode: linux-clang-x64
    Other Flags:
        --clang
        --clang_version=100000
Total Memory Usage: 157 MB

------- Workspace parsing diagnostics -------
Number of folders and files enumerated: 7607
Number of files discovered (not excluded): 7234

cpptools/didChangeCppProperties
Attempting to get defaults from C compiler in "compilerPath" property: '/usr/bin/clang'
Compiler query command line: "/usr/bin/clang" -std=c11 -Wp,-v -E -dD -x c -m64 -fno-blocks /dev/null
terminating child process: 10538
Code browsing service initialized
Attempting to get defaults from C++ compiler in "compilerPath" property: '/usr/bin/clang'
Compiler query command line: "/usr/bin/clang" -std=c++20 -Wp,-v -E -dD -x c++ -m64 -fno-blocks /dev/null
terminating child process: 10540
  Folder: /usr/include/ will be indexed
  Folder: /usr/lib/llvm-10/lib/clang/10.0.0/include/ will be indexed
  Folder: /usr/local/include/ will be indexed
  Folder: /home/sames/Projects/sandbox/ will be indexed
textDocument/didOpen: file:///home/sames/Projects/sandbox/ut.hpp
Populate include completion cache.
Discovering files...
Checking for syntax errors: file:///home/sames/Projects/sandbox/ut.hpp
cpptools/activeDocumentChange: file:///home/sames/Projects/sandbox/ut.hpp
cpptools/textEditorSelectionChange
cpptools/clearCustomConfigurations
cpptools/getCodeActions: file:///home/sames/Projects/sandbox/ut.hpp (id: 2)
terminating child process: 10541
  Processing folder (recursive): /usr/include/
terminating child process: 10544
sending compilation args for /home/sames/Projects/sandbox/main.cpp
  include: /usr/include/c++/10
  include: /usr/include/x86_64-linux-gnu/c++/10
  include: /usr/include/c++/10/backward
  include: /usr/local/include
  include: /usr/lib/llvm-10/lib/clang/10.0.0/include
  include: /usr/include/x86_64-linux-gnu
  include: /usr/include
  include: /home/sames/Projects/sandbox
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  define: __clang_patchlevel__=0
  define: __clang_version__="10.0.0 "
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  define: __UINT_LEAST64_FMTu__="lu"
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  define: __UINT_LEAST64_FMTX__="lX"
  define: __INT_FAST8_TYPE__=signed char
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  define: __INT_FAST8_FMTd__="hhd"
  define: __INT_FAST8_FMTi__="hhi"
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  define: __UINT_FAST8_FMTX__="hhX"
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  define: __INT_FAST16_FMTd__="hd"
  define: __INT_FAST16_FMTi__="hi"
  define: __UINT_FAST16_TYPE__=unsigned short
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  define: __UINT_FAST64_FMTu__="lu"
  define: __UINT_FAST64_FMTx__="lx"
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  define: __GCC_ATOMIC_POINTER_LOCK_FREE=2
  define: __NO_INLINE__=1
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  define: __DECIMAL_DIG__=__LDBL_DECIMAL_DIG__
  define: __GCC_ASM_FLAG_OUTPUTS__=1
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  define: __seg_gs=__attribute__((address_space(256)))
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  define: __k8=1
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  define: __REGISTER_PREFIX__=
  define: __NO_MATH_INLINES=1
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  define: __unix=1
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  define: __gnu_linux__=1
  define: _GNU_SOURCE=1
  define: __FLOAT128__=1
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  define: __cplusplus=202002L
  define: __STDCPP_DEFAULT_NEW_ALIGNMENT__=16UL
  define: __STDC_UTF_16__=1
  define: __STDC_UTF_32__=1
  other: --clang
  other: --clang_version=100000
  stdver: c++20
  intelliSenseMode: linux-clang-x64
Checking for syntax errors: file:///home/sames/Projects/sandbox/ut.hpp
Shutting down IntelliSense server: /home/sames/Projects/sandbox/main.cpp
cpptools/getFoldingRanges: file:///home/sames/Projects/sandbox/ut.hpp (id: 3)
sending compilation args for /home/sames/Projects/sandbox/main.cpp
  include: /usr/include/c++/10
  include: /usr/include/x86_64-linux-gnu/c++/10
  include: /usr/include/c++/10/backward
  include: /usr/local/include
  include: /usr/lib/llvm-10/lib/clang/10.0.0/include
  include: /usr/include/x86_64-linux-gnu
  include: /usr/include
  include: /home/sames/Projects/sandbox
  define: __llvm__=1
  define: __clang__=1
  define: __clang_major__=10
  define: __clang_minor__=0
  define: __clang_patchlevel__=0
  define: __clang_version__="10.0.0 "
  define: __GNUC__=4
  define: __GNUC_MINOR__=2
  define: __GNUC_PATCHLEVEL__=1
  define: __GXX_ABI_VERSION=1002
  define: __GNUG__=4
  define: __GXX_WEAK__=1
  define: __ATOMIC_RELAXED=0
  define: __ATOMIC_CONSUME=1
  define: __ATOMIC_ACQUIRE=2
  define: __ATOMIC_RELEASE=3
  define: __ATOMIC_ACQ_REL=4
  define: __ATOMIC_SEQ_CST=5
  define: __OPENCL_MEMORY_SCOPE_WORK_ITEM=0
  define: __OPENCL_MEMORY_SCOPE_WORK_GROUP=1
  define: __OPENCL_MEMORY_SCOPE_DEVICE=2
  define: __OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES=3
  define: __OPENCL_MEMORY_SCOPE_SUB_GROUP=4
  define: __PRAGMA_REDEFINE_EXTNAME=1
  define: __VERSION__="Clang 10.0.0 "
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  define: __SIZE_FMTX__="lX"
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  define: __UINTPTR_FMTX__="lX"
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  define: __DBL_MIN_EXP__=(-1021)
  define: __DBL_MIN__=2.2250738585072014e-308
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  define: __INT8_C_SUFFIX__=
  define: __INT16_TYPE__=short
  define: __INT16_FMTd__="hd"
  define: __INT16_FMTi__="hi"
  define: __INT16_C_SUFFIX__=
  define: __INT32_TYPE__=int
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  define: __INT32_FMTi__="i"
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  define: __INT64_TYPE__=long int
  define: __INT64_FMTd__="ld"
  define: __INT64_FMTi__="li"
  define: __INT64_C_SUFFIX__=L
  define: __UINT8_TYPE__=unsigned char
  define: __UINT8_FMTo__="hho"
  define: __UINT8_FMTu__="hhu"
  define: __UINT8_FMTx__="hhx"
  define: __UINT8_FMTX__="hhX"
  define: __UINT8_C_SUFFIX__=
  define: __UINT8_MAX__=255
  define: __INT8_MAX__=127
  define: __UINT16_TYPE__=unsigned short
  define: __UINT16_FMTo__="ho"
  define: __UINT16_FMTu__="hu"
  define: __UINT16_FMTx__="hx"
  define: __UINT16_FMTX__="hX"
  define: __UINT16_C_SUFFIX__=
  define: __UINT16_MAX__=65535
  define: __INT16_MAX__=32767
  define: __UINT32_TYPE__=unsigned int
  define: __UINT32_FMTo__="o"
  define: __UINT32_FMTu__="u"
  define: __UINT32_FMTx__="x"
  define: __UINT32_FMTX__="X"
  define: __UINT32_C_SUFFIX__=U
  define: __UINT32_MAX__=4294967295U
  define: __INT32_MAX__=2147483647
  define: __UINT64_TYPE__=long unsigned int
  define: __UINT64_FMTo__="lo"
  define: __UINT64_FMTu__="lu"
  define: __UINT64_FMTx__="lx"
  define: __UINT64_FMTX__="lX"
  define: __UINT64_C_SUFFIX__=UL
  define: __UINT64_MAX__=18446744073709551615UL
  define: __INT64_MAX__=9223372036854775807L
  define: __INT_LEAST8_TYPE__=signed char
  define: __INT_LEAST8_MAX__=127
  define: __INT_LEAST8_FMTd__="hhd"
  define: __INT_LEAST8_FMTi__="hhi"
  define: __UINT_LEAST8_TYPE__=unsigned char
  define: __UINT_LEAST8_MAX__=255
  define: __UINT_LEAST8_FMTo__="hho"
  define: __UINT_LEAST8_FMTu__="hhu"
  define: __UINT_LEAST8_FMTx__="hhx"
  define: __UINT_LEAST8_FMTX__="hhX"
  define: __INT_LEAST16_TYPE__=short
  define: __INT_LEAST16_MAX__=32767
  define: __INT_LEAST16_FMTd__="hd"
  define: __INT_LEAST16_FMTi__="hi"
  define: __UINT_LEAST16_TYPE__=unsigned short
  define: __UINT_LEAST16_MAX__=65535
  define: __UINT_LEAST16_FMTo__="ho"
  define: __UINT_LEAST16_FMTu__="hu"
  define: __UINT_LEAST16_FMTx__="hx"
  define: __UINT_LEAST16_FMTX__="hX"
  define: __INT_LEAST32_TYPE__=int
  define: __INT_LEAST32_MAX__=2147483647
  define: __INT_LEAST32_FMTd__="d"
  define: __INT_LEAST32_FMTi__="i"
  define: __UINT_LEAST32_TYPE__=unsigned int
  define: __UINT_LEAST32_MAX__=4294967295U
  define: __UINT_LEAST32_FMTo__="o"
  define: __UINT_LEAST32_FMTu__="u"
  define: __UINT_LEAST32_FMTx__="x"
  define: __UINT_LEAST32_FMTX__="X"
  define: __INT_LEAST64_TYPE__=long int
  define: __INT_LEAST64_MAX__=9223372036854775807L
  define: __INT_LEAST64_FMTd__="ld"
  define: __INT_LEAST64_FMTi__="li"
  define: __UINT_LEAST64_TYPE__=long unsigned int
  define: __UINT_LEAST64_MAX__=18446744073709551615UL
  define: __UINT_LEAST64_FMTo__="lo"
  define: __UINT_LEAST64_FMTu__="lu"
  define: __UINT_LEAST64_FMTx__="lx"
  define: __UINT_LEAST64_FMTX__="lX"
  define: __INT_FAST8_TYPE__=signed char
  define: __INT_FAST8_MAX__=127
  define: __INT_FAST8_FMTd__="hhd"
  define: __INT_FAST8_FMTi__="hhi"
  define: __UINT_FAST8_TYPE__=unsigned char
  define: __UINT_FAST8_MAX__=255
  define: __UINT_FAST8_FMTo__="hho"
  define: __UINT_FAST8_FMTu__="hhu"
  define: __UINT_FAST8_FMTx__="hhx"
  define: __UINT_FAST8_FMTX__="hhX"
  define: __INT_FAST16_TYPE__=short
  define: __INT_FAST16_MAX__=32767
  define: __INT_FAST16_FMTd__="hd"
  define: __INT_FAST16_FMTi__="hi"
  define: __UINT_FAST16_TYPE__=unsigned short
  define: __UINT_FAST16_MAX__=65535
  define: __UINT_FAST16_FMTo__="ho"
  define: __UINT_FAST16_FMTu__="hu"
  define: __UINT_FAST16_FMTx__="hx"
  define: __UINT_FAST16_FMTX__="hX"
  define: __INT_FAST32_TYPE__=int
  define: __INT_FAST32_MAX__=2147483647
  define: __INT_FAST32_FMTd__="d"
  define: __INT_FAST32_FMTi__="i"
  define: __UINT_FAST32_TYPE__=unsigned int
  define: __UINT_FAST32_MAX__=4294967295U
  define: __UINT_FAST32_FMTo__="o"
  define: __UINT_FAST32_FMTu__="u"
  define: __UINT_FAST32_FMTx__="x"
  define: __UINT_FAST32_FMTX__="X"
  define: __INT_FAST64_TYPE__=long int
  define: __INT_FAST64_MAX__=9223372036854775807L
  define: __INT_FAST64_FMTd__="ld"
  define: __INT_FAST64_FMTi__="li"
  define: __UINT_FAST64_TYPE__=long unsigned int
  define: __UINT_FAST64_MAX__=18446744073709551615UL
  define: __UINT_FAST64_FMTo__="lo"
  define: __UINT_FAST64_FMTu__="lu"
  define: __UINT_FAST64_FMTx__="lx"
  define: __UINT_FAST64_FMTX__="lX"
  define: __USER_LABEL_PREFIX__=
  define: __FINITE_MATH_ONLY__=0
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  define: __CLANG_ATOMIC_CHAR8_T_LOCK_FREE=2
  define: __CLANG_ATOMIC_CHAR16_T_LOCK_FREE=2
  define: __CLANG_ATOMIC_CHAR32_T_LOCK_FREE=2
  define: __CLANG_ATOMIC_WCHAR_T_LOCK_FREE=2
  define: __CLANG_ATOMIC_SHORT_LOCK_FREE=2
  define: __CLANG_ATOMIC_INT_LOCK_FREE=2
  define: __CLANG_ATOMIC_LONG_LOCK_FREE=2
  define: __CLANG_ATOMIC_LLONG_LOCK_FREE=2
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  define: __GCC_ATOMIC_CHAR16_T_LOCK_FREE=2
  define: __GCC_ATOMIC_CHAR32_T_LOCK_FREE=2
  define: __GCC_ATOMIC_WCHAR_T_LOCK_FREE=2
  define: __GCC_ATOMIC_SHORT_LOCK_FREE=2
  define: __GCC_ATOMIC_INT_LOCK_FREE=2
  define: __GCC_ATOMIC_LONG_LOCK_FREE=2
  define: __GCC_ATOMIC_LLONG_LOCK_FREE=2
  define: __GCC_ATOMIC_POINTER_LOCK_FREE=2
  define: __NO_INLINE__=1
  define: __FLT_EVAL_METHOD__=0
  define: __FLT_RADIX__=2
  define: __DECIMAL_DIG__=__LDBL_DECIMAL_DIG__
  define: __GCC_ASM_FLAG_OUTPUTS__=1
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  define: __amd64__=1
  define: __amd64=1
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  define: __x86_64__=1
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  define: __SEG_FS=1
  define: __seg_gs=__attribute__((address_space(256)))
  define: __seg_fs=__attribute__((address_space(257)))
  define: __k8=1
  define: __k8__=1
  define: __tune_k8__=1
  define: __REGISTER_PREFIX__=
  define: __NO_MATH_INLINES=1
  define: __FXSR__=1
  define: __SSE2__=1
  define: __SSE2_MATH__=1
  define: __SSE__=1
  define: __SSE_MATH__=1
  define: __MMX__=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8=1
  define: __SIZEOF_FLOAT128__=16
  define: __unix=1
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  define: __linux=1
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  define: __gnu_linux__=1
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  define: __STDC__=1
  define: __STDC_HOSTED__=1
  define: __cplusplus=202002L
  define: __STDCPP_DEFAULT_NEW_ALIGNMENT__=16UL
  define: __STDC_UTF_16__=1
  define: __STDC_UTF_32__=1
  other: --clang
  other: --clang_version=100000
  stdver: c++20
  intelliSenseMode: linux-clang-x64
Queueing IntelliSense update for files in translation unit of: /home/sames/Projects/sandbox/main.cpp
cpptools/getSemanticTokens: file:///home/sames/Projects/sandbox/ut.hpp (id: 4)
  Processing folder (recursive): /usr/lib/llvm-10/lib/clang/10.0.0/include/
  Processing folder (recursive): /usr/local/include/
  Processing folder (recursive): /home/sames/Projects/sandbox/
  Discovering files: 7234 file(s) processed
  0 file(s) removed from database
Done discovering files.
Parsing remaining files...
  Parsing: 0 files(s) processed
Done parsing remaining files.
idle loop: reparsing the active document
cpptools/getCodeActions: file:///home/sames/Projects/sandbox/ut.hpp (id: 5)
cpptools/getDocumentSymbols: file:///home/sames/Projects/sandbox/ut.hpp (id: 6)
cpptools/getDocumentSymbols
Checking for syntax errors: file:///home/sames/Projects/sandbox/ut.hpp
Queueing IntelliSense update for files in translation unit of: /home/sames/Projects/sandbox/main.cpp
cpptools/finishUpdateSquiggles
Error squiggle count: 2
terminating child process: 10582
Update IntelliSense time (sec): 1.592
cpptools/getFoldingRanges: file:///home/sames/Projects/sandbox/ut.hpp (id: 7)
cpptools/getCodeActions: file:///home/sames/Projects/sandbox/ut.hpp (id: 8)

Screenshots

Additional context

[celonymire]

Some edits were made to the issue description, posting this comment to let you guys know in time.

[sean-mcmanus]

The header has a bug and doesn't compile correctly when __cpp_modules is defined due to code:

#if defined(__cpp_modules)
export namespace boost::inline ext::ut {
#else
namespace boost {
inline namespace ext {
namespace ut {
#endif
...
}  // namespace v1_1_8
}  // namespace ut
}  // namespace inline ext
}  // namespace boost

Replacing the last 2 lines with

#if !defined(__cpp_modules)
}  // namespace inline ext
}  // namespace boost
#endif

fixes the issue.

This can be seen via opening the header and seeing the squiggle at the bottom. There's an additional squiggle related to #6302 . Fixing #3207 would enable showing the squiggles in the header file without having to open the header.