Vscode-cpptools: Intellisense reports diagnostic on lambda to std::function conversion

[BastianBlokland]

Type: LanguageService

Describe the bug

• OS and Version: Macos 10.14.6 (18G103).
• VS Code Version: 1.38.1.
• C/C++ Extension Version: 0.26.0-insiders2 & 0.25.1 (without other plugins).
• Compiler:

clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin

Intellisense reports diagnostic on lambda to std::function conversion.

In the following program a diagnostic is reported.

#include <functional>

auto main() -> int {
    std::function<void()> f = []() {

    };
    return 0;
}

Reported diagnostic: no suitable user-defined conversion from "lambda []void ()->void" to "std::__1::function<void ()>" exists.

No diagnostics are reported by running /usr/local/opt/llvm/bin/clang++ main.cpp -Wall -Wextra.

Might be a configuration issue on my side but a internet search didn't provide any insights, thanks in advance for the support.

Screenshots

Additional context

c_cpp_properties.json contents:

{
    "configurations": [
        {
            "name": "Mac",
            "compilerPath": "/usr/local/opt/llvm/bin/clang++",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "clang-x64",
            "compilerArgs": [],
            "includePath": []
        }
    ],
    "version": 4
}

Debug logs

initialized
workspace/didChangeConfiguration
IntelliSense Engine = Default.
Autocomplete is enabled.
Enhanced Colorization is enabled.
Error squiggles are enabled if all header dependencies are resolved.
File exclude: **/.git
File exclude: **/.svn
File exclude: **/.hg
File exclude: **/CVS
File exclude: **/.DS_Store
File exclude: **/.vscode
Search exclude: **/node_modules
Search exclude: **/bower_components
Search exclude: **/.vscode
Attempting to get defaults from compiler found on the machine: '/usr/local/opt/llvm/bin/clang'
terminating child process: 11037
cpptools/queryCompilerDefaults: 1
Attempting to get defaults from compiler found on the machine: '/usr/local/opt/llvm/bin/clang'
terminating child process: 11041
cpptools/didChangeFolderSettings
Attempting to get defaults from compiler in "compilerPath" property: '/usr/local/opt/llvm/bin/clang++'
terminating child process: 11047
Code browsing service initialized
Attempting to get defaults from compiler in "compilerPath" property: '/usr/local/opt/llvm/bin/clang++'
terminating child process: 11050
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sending compilation args for /Users/bastian/dev/playground/cpp-intellisense-test/main.cpp
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  define: __INT8_FMTi__="hhi"
  define: __INT8_C_SUFFIX__=
  define: __INT16_TYPE__=short
  define: __INT16_FMTd__="hd"
  define: __INT16_FMTi__="hi"
  define: __INT16_C_SUFFIX__=
  define: __INT32_TYPE__=int
  define: __INT32_FMTd__="d"
  define: __INT32_FMTi__="i"
  define: __INT32_C_SUFFIX__=
  define: __INT64_TYPE__=long long int
  define: __INT64_FMTd__="lld"
  define: __INT64_FMTi__="lli"
  define: __INT64_C_SUFFIX__=LL
  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 long unsigned int
  define: __UINT64_FMTo__="llo"
  define: __UINT64_FMTu__="llu"
  define: __UINT64_FMTx__="llx"
  define: __UINT64_FMTX__="llX"
  define: __UINT64_C_SUFFIX__=ULL
  define: __UINT64_MAX__=18446744073709551615ULL
  define: __INT64_MAX__=9223372036854775807LL
  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 long int
  define: __INT_LEAST64_MAX__=9223372036854775807LL
  define: __INT_LEAST64_FMTd__="lld"
  define: __INT_LEAST64_FMTi__="lli"
  define: __UINT_LEAST64_TYPE__=long long unsigned int
  define: __UINT_LEAST64_MAX__=18446744073709551615ULL
  define: __UINT_LEAST64_FMTo__="llo"
  define: __UINT_LEAST64_FMTu__="llu"
  define: __UINT_LEAST64_FMTx__="llx"
  define: __UINT_LEAST64_FMTX__="llX"
  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 long int
  define: __INT_FAST64_MAX__=9223372036854775807LL
  define: __INT_FAST64_FMTd__="lld"
  define: __INT_FAST64_FMTi__="lli"
  define: __UINT_FAST64_TYPE__=long long unsigned int
  define: __UINT_FAST64_MAX__=18446744073709551615ULL
  define: __UINT_FAST64_FMTo__="llo"
  define: __UINT_FAST64_FMTu__="llu"
  define: __UINT_FAST64_FMTx__="llx"
  define: __UINT_FAST64_FMTX__="llX"
  define: __USER_LABEL_PREFIX__=_
  define: __FINITE_MATH_ONLY__=0
  define: __GNUC_GNU_INLINE__=1
  define: __GCC_ATOMIC_TEST_AND_SET_TRUEVAL=1
  define: __CLANG_ATOMIC_BOOL_LOCK_FREE=2
  define: __CLANG_ATOMIC_CHAR_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
  define: __CLANG_ATOMIC_POINTER_LOCK_FREE=2
  define: __GCC_ATOMIC_BOOL_LOCK_FREE=2
  define: __GCC_ATOMIC_CHAR_LOCK_FREE=2
  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: __PIC__=2
  define: __pic__=2
  define: __FLT_EVAL_METHOD__=0
  define: __FLT_RADIX__=2
  define: __DECIMAL_DIG__=__LDBL_DECIMAL_DIG__
  define: __SSP__=1
  define: __nonnull=_Nonnull
  define: __null_unspecified=_Null_unspecified
  define: __nullable=_Nullable
  define: __GCC_ASM_FLAG_OUTPUTS__=1
  define: __code_model_small_=1
  define: __amd64__=1
  define: __amd64=1
  define: __x86_64=1
  define: __x86_64__=1
  define: __SEG_GS=1
  define: __SEG_FS=1
  define: __seg_gs=__attribute__((address_space(256)))
  define: __seg_fs=__attribute__((address_space(257)))
  define: __core2=1
  define: __core2__=1
  define: __tune_core2__=1
  define: __REGISTER_PREFIX__=
  define: __NO_MATH_INLINES=1
  define: __FXSR__=1
  define: __SSE4_1__=1
  define: __SSSE3__=1
  define: __SSE3__=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: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16=1
  define: __APPLE_CC__=6000
  define: __APPLE__=1
  define: __STDC_NO_THREADS__=1
  define: OBJC_NEW_PROPERTIES=1
  define: __weak=__attribute__((objc_gc(weak)))
  define: __strong=
  define: __unsafe_unretained=
  define: __DYNAMIC__=1
  define: __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=101400
  define: __MACH__=1
  define: __STDC__=1
  define: __STDC_HOSTED__=1
  define: __cplusplus=201703L
  define: __STDCPP_DEFAULT_NEW_ALIGNMENT__=16UL
  define: __STDC_UTF_16__=1
  define: __STDC_UTF_32__=1
  other: --clang
  other: --clang_version=90000
  stdver: c++17
  intelliSenseMode: clang-x64
textDocument/codeAction: 4
idle loop: reparsing the active document
Checking for syntax errors: file:///Users/bastian/dev/playground/cpp-intellisense-test/main.cpp
queue_update_intellisense for files in tu of: /Users/bastian/dev/playground/cpp-intellisense-test/main.cpp
errorSquiggles count: 1
terminating child process: 11058
Update IntelliSense time (sec): 3.758
textDocument/codeAction: 5

[sean-mcmanus]

I wasn't able to repro this with Mac clang 11.0 (based on clang 8), so it could be specific to the non-Xcode clang 9.0.

[sean-mcmanus]

I was able to get the repro, but in order to get stdlib.h to be found, I had to add the XCode's path to /usr/include. Do you know how you configured your compiler to get the correct path to stdlib.h? When I do C/C++: Log Diagnostics, the includes shows:

/usr/local/Cellar/llvm/9.0.0/include/c++/v1
/usr/local/include
/usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0/include

Is yours different?

[BastianBlokland]

Thanks for looking into this, i forgot to mention i have these env args set:

LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib"
CPPFLAGS="-I/usr/local/opt/llvm/include -I/usr/local/opt/llvm/include/c++/v1/"

C/C++: Log Diagnostics is the same for me (full log is in the folded section of the op):

/usr/local/Cellar/llvm/9.0.0/include/c++/v1
/usr/local/include
/usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0/include

Here's the output of /usr/local/opt/llvm/bin/clang++ main.cpp --verbose

clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin
 "/usr/local/Cellar/llvm/9.0.0/bin/clang-9" -cc1 -triple x86_64-apple-macosx10.14.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn -dwarf-column-info -debugger-tuning=lldb -ggnu-pubnames -target-linker-version 512.4 -v -resource-dir /usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0 -stdlib=libc++ -internal-isystem /usr/local/opt/llvm/bin/../include/c++/v1 -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/include -internal-isystem /usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0/include -internal-externc-isystem /usr/include -fdeprecated-macro -fdebug-compilation-dir /Users/bastian/dev/playground/cpp-intellisense-test -ferror-limit 19 -fmessage-length 219 -stack-protector 1 -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fobjc-runtime=macosx-10.14.0 -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/2n/j0mcg5kj62g2955c6sdrbwsw0000gn/T/main-2080cf.o -x c++ main.cpp
clang -cc1 version 9.0.0 based upon LLVM 9.0.0 default target x86_64-apple-darwin18.7.0
ignoring nonexistent directory "/usr/include/c++/v1"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/opt/llvm/bin/../include/c++/v1
 /usr/local/include
 /usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
 "/usr/bin/ld" -demangle -lto_library /usr/local/Cellar/llvm/9.0.0/lib/libLTO.dylib -no_deduplicate -dynamic -arch x86_64 -macosx_version_min 10.14.0 -o a.out /var/folders/2n/j0mcg5kj62g2955c6sdrbwsw0000gn/T/main-2080cf.o -lc++ -lSystem /usr/local/Cellar/llvm/9.0.0/lib/clang/9.0.0/lib/darwin/libclang_rt.osx.a

[BastianBlokland]

I believe the stdlib.h was added to /usr/include by running xcode-select --install, but i'm not 100% sure.

[sean-mcmanus]

Thanks for the info. I got repro using VS. I've reported the bug at https://developercommunity.visualstudio.com/content/problem/763979/cc-intellisense-errors-with-clang-90-functional-no.html .

[sean-mcmanus]

This appears to be fixed with 0.28.1. Let us know if you're still hitting it.