Vscode-cpptools: Incomplete type error on struct addrinfo

Created on 22 May 2018 · 23Comments · Source: microsoft/vscode-cpptools

* Operating System and version: Solus (3.999...)
* VS Code version and if you are using the Insiders build: 1.23.1
* C/C++ extension version: 0.17.1
* Relevant settings from your settings.json, c_cpp_properties.json, and/or launch.json files:

c_cpp_properties.json
{
    "configurations": [
        {
            "name": "Linux",
            "browse": {
                "path": [
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": true
            },
            "includePath": [
                "${workspaceFolder}/**",
                "${workspaceFolder}/include",
                "/usr/include",
                "/usr/include"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "clang-x64"
        }
    ],
    "version": 4
}

settings.json:
"[c]": {
    "editor.formatOnPaste": true,
    "editor.formatOnSave": true,
    "editor.formatOnType": true,
},
  "[cpp]": {
    "editor.formatOnPaste": true,
    "editor.formatOnSave": true,
    "editor.formatOnType": true,
},

Following code sample

#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>

#include "server.h"

void start_server(const unsigned char ipv, const char *port, const unsigned long backlog)
{
    struct addrinfo hints;
    memset(&hints, 0, sizeof(hints));

    switch (ipv) {
    case 4:
        hints.ai_family = AF_INET;
        break;
    case 6:
        hints.ai_family = AF_INET6;
        break;
    default:
        fprintf(stderr, "IP version must be either 4 or 6\n");
        exit(1);
        break;
    }

    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags    = AI_PASSIVE;    // use my IP
}

I am experiencing errors on line 1 of the function: incomplete type error on struct addrinfo

Also the constant AI_PASSIVE is apparently undefined.

Both the struct and constant are defined in netdb.h.

Should be noted hover, and follow work perfectly.

Language Service bug more info needed

Source

tristan957

Most helpful comment

I misunderstood @tristan957's comment about adding _GNU_SOURCE to the defines. I was not sure what he meant. But like he said, adding _GNU_SOURCE to the defines in c_cpp_properties.json fixed the issue.

"defines": [
    "__linux__",
    "__x86_64__",
    "_GNU_SOURCE"
]

GeneralOneill on 9 Jul 2018

👍18

All 23 comments

I repro that bug if netdb.h is commented out (otherwise not) -- there seems to be some problem locating that. There are some known bugs with recursive includes that you could be hitting that could be causing the path to netdb.h to get excluded, which we plan to release a fix for tomorrow. If you set your loggingLevel to "Debug" and then open the file, you should see the paths we use after "sending compilation args" in the C/C++ section of the Output pane. It's probably best to wait till 0.17.2 to be released then we can follow up if it still repros.

sean-mcmanus on 22 May 2018

We have a 0.17.2-insiders build at https://github.com/Microsoft/vscode-cpptools/releases/tag/v0.17.2-insiders with the recursive includes fix and a bunch of others. Do you repro the bug with that?

sean-mcmanus on 22 May 2018

Is this still reproing with 0.17.3?

sean-mcmanus on 23 May 2018

@sean-mcmanus I will give it a try when I get off of work with the .3 release

tristan957 on 24 May 2018

Still not working. I tried setting "loggingLevel": "Debug" in the root object of c_cpp_properties.json.
I am not seeing an output for C/C++

tristan957 on 25 May 2018

You should see some output -- oh, it's a setting in settings.json (C_Cpp.loggingLevel) not a c_cpp_properties.json setting. See https://github.com/Microsoft/vscode-cpptools/blob/master/Documentation/LanguageServer/Enabling%20logging.md . The output should show what includePath we end up using from the recursive includes. We could be excluding something by mistake.

You may want to try removing the "**" -- we've received reports of problems with the recursive includes feature, although we haven't been able to repro the issues yet (other than some known scalability issues with large workspaces).

sean-mcmanus on 25 May 2018

Attempting to get defaults from compiler in "compilerPath" property: '/usr/bin/gcc'
terminating child process: 5293
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Discovering files...
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  Processing folder (recursive): /home/tristan957/Projects/socket-messenger/
  Discovering files: 9593 file(s) processed
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Done discovering files.
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textDocument/didOpen
Attempting to get defaults from compiler in "compilerPath" property: '/usr/bin/gcc'
textDocument/codeAction
cpptools/activeDocumentChange
Checking for syntax errors: file:///home/tristan957/Projects/socket-messenger/src/server/server.c
cpptools/textEditorSelectionChange
cpptools/textEditorSelectionChange
textDocument/documentHighlight
terminating child process: 5338
sending compilation args for /home/tristan957/Projects/socket-messenger/src/server/server.c
  include: /home/tristan957/Projects/socket-messenger/include
  include: /usr/lib64/gcc/x86_64-solus-linux/7.3.0/include
  include: /usr/lib64/gcc/x86_64-solus-linux/7.3.0/include-fixed
  include: /usr/include
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  define: __STDC_IEC_559__=1
  define: __STDC_IEC_559_COMPLEX__=1
  define: __STDC_ISO_10646__=201706L
  define: __STDC_NO_THREADS__=1
  stdver: --c11
queue_update_intellisense for files in tu of: /home/tristan957/Projects/socket-messenger/src/server/server.c
textDocument/codeAction
terminating child process: 5357
errorSquiggles count: 13
textDocument/codeAction

Seems that the extension is correctly identifying the header file for AI_PASSIVE

Checking for syntax errors: file:///usr/include/netdb.h

I remembered issues with the ** includes, but that seems to be fixed at this moment

tristan957 on 25 May 2018

I'm confused now. What's the bug you're experiencing? Is it unable to find the definition of addrinfo? And removing recursive includes fixes it? Do you know what path is incorrectly being used or excluded with recursive includes? This can happen if the file with addrinfo matches the same name of a file in your workspaceFolder.

sean-mcmanus on 25 May 2018

There are squiggles on terms that are clearly defined in header files. addrinfo, AI_PASSIVE. When I Ctrl+click them I get taken to the header file with the definition of said file. The error is that these terms are incomplete type and undefined respectively.

As far as the ** issue, I am no longer experiencing the issue you mentioned with 0.17.3.

I have no header files with the same name as system header files.

tristan957 on 25 May 2018

This compiles just fine using C11

tristan957 on 25 May 2018

Ctrl + Click results are obtained from a different system (tag parser) than the squiggles (IntelliSense), so the squiggles part may not be getting the correct path.

My best guess is that some required defines are incorrect, possibly some flags are required to be passed to gcc (in our "compilerPath" setting). @bobbrow @grdowns Do you guys have gcc 7.3 headers to try out this repro?

Is addrinfo gray when you view its definition? (gray means it's not visible to our IntelliSense engine). If not, you can look for #ifdef macros that need to be defined.

sean-mcmanus on 25 May 2018

It is gray. Weird thing happening. Program compiled yesterday, but no longer compiling today. I'm looking into user error at the moment. Thanks for the tip

tristan957 on 25 May 2018

Well I finally got the issue fixed. Added "_GNU_SOURCE" to the defines and added it to my build system. Everything is working fine now. I would like to apologize for posting this issue. Stupidity got the best of me.

tristan957 on 25 May 2018

👍9

I am still facing this issue. Intellisense is able to locate<netdb.h> but does not identify the symbols defined in that file. I am using the 0.17.6 release.
![image](https://user-images.githubusercontent.com/1

I am using WSL's gcc to compile my code, and I have set up my c_cpp_properties.json as follows. I configured the c_cpp_properties.json per the official documentation here.

{
    "name": "WSL",
    "intelliSenseMode": "clang-x64",
    "includePath": [
        "${workspaceRoot}",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/c++/5",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/x86_64-linux-gnu/c++/5",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/c++/5/backward",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/lib/gcc/x86_64-linux-gnu/5/include",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/local/include",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/lib/gcc/x86_64-linux-gnu/5/include-fixed",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/x86_64-linux-gnu",
        "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include"
    ],
    "defines": [
        "__linux__",
        "__x86_64__"
    ],
    "browse": {
        "path": [
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/c++/5",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/x86_64-linux-gnu/c++/5",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/lib/gcc/x86_64-linux-gnu/5/include",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/local/include",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/lib/gcc/x86_64-linux-gnu/5/include-fixed",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/x86_64-linux-gnu",
            "${localappdata}/Packages/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/LocalState/rootfs/usr/include/*"
        ],
        "limitSymbolsToIncludedHeaders": true,
        "databaseFilename": ""
    }
}

The code compiles and runs. Previous posts mentions that the compilerPath setting may be defined incorrectly, but for WSL how do I configure that?

Thanks in advance!

GeneralOneill on 9 Jul 2018

"defines": [
    "__linux__",
    "__x86_64__",
    "_GNU_SOURCE"
]

GeneralOneill on 9 Jul 2018

👍18

@GeneralOneill, our WSL support allows for linux-style paths, so you can set "compilerPath": "/usr/bin/gcc" in your configuration and we'll pick it up. That also allows you to simplify your includePath/browse.path by removing the system include paths from them. You also shouldn't need to set _GNU_SOURCE in the defines if the compilerPath is set.

bobbrow on 9 Jul 2018

@bobbrow so my c_cpp_properties.json now looks like this.

{
    "configurations": [
        {
            "name": "WSL",
            "intelliSenseMode": "clang-x64",
            "compilerPath": "/usr/bin/gcc",
            "includePath": [
                "${workspaceRoot}"
            ],
            "defines": [],
            "browse": {
                "path": [
                    "${workspaceRoot}"
                ],
                "limitSymbolsToIncludedHeaders": true,
                "databaseFilename": ""
            }
        }
    ],
    "version": 4
}

However once again, intellisense is unable to locate symbols from netdb.h, but everything else seems to work fine. I have linked my code snippet here.

If I put _GNU_SOURCE back into the defines everything works fine.

GeneralOneill on 9 Jul 2018

The following question seems relevant: https://stackoverflow.com/questions/33076175/why-is-struct-addrinfo-defined-only-if-use-xopen2k-is-defined.

I had to add #define __USE_XOPEN2K to server.h to get the addrinfo struct to be defined. I'm not sure why adding it to the "defines" array didn't work though. I need to investigate that.

bobbrow on 9 Jul 2018

I got it. The correct thing to do is add _POSIX_C_SOURCE=200112L to the "defines" array instead of #define __USE_XOPEN2K.

bobbrow on 9 Jul 2018

🎉10

Just for future readers:
I got it to work without including any headers in the "defines" array. My .vscode/c_cpp_properties.json file contained the following configuration:

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "${default}",
            "intelliSenseMode": "${default}"
        }
    ],
    "version": 4
}

My guess is that having "intelliSenseMode" set to "${default}" (which defaults to "gcc-x64") fixes the issue.

adyavanapalli on 15 Jun 2019

👍2

Attempting to get defaults from compiler in "compilerPath" property: '/usr/bin/gcc'
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Discovering files...
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  Processing folder (recursive): /usr/lib64/gcc/x86_64-solus-linux/7.3.0/include-fixed/
  Processing folder (recursive): /usr/include/
  Processing folder (recursive): /home/tristan957/Projects/socket-messenger/
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textDocument/codeAction
cpptools/activeDocumentChange
Checking for syntax errors: file:///home/tristan957/Projects/socket-messenger/src/server/server.c
cpptools/textEditorSelectionChange
cpptools/textEditorSelectionChange
textDocument/documentHighlight
terminating child process: 5338
sending compilation args for /home/tristan957/Projects/socket-messenger/src/server/server.c
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  define: __DEC32_EPSILON__=1E-6DF
  define: __DEC32_SUBNORMAL_MIN__=0.000001E-95DF
  define: __DEC64_MANT_DIG__=16
  define: __DEC64_MIN_EXP__=(-382)
  define: __DEC64_MAX_EXP__=385
  define: __DEC64_MIN__=1E-383DD
  define: __DEC64_MAX__=9.999999999999999E384DD
  define: __DEC64_EPSILON__=1E-15DD
  define: __DEC64_SUBNORMAL_MIN__=0.000000000000001E-383DD
  define: __DEC128_MANT_DIG__=34
  define: __DEC128_MIN_EXP__=(-6142)
  define: __DEC128_MAX_EXP__=6145
  define: __DEC128_MIN__=1E-6143DL
  define: __DEC128_MAX__=9.999999999999999999999999999999999E6144DL
  define: __DEC128_EPSILON__=1E-33DL
  define: __DEC128_SUBNORMAL_MIN__=0.000000000000000000000000000000001E-6143DL
  define: __REGISTER_PREFIX__=
  define: __USER_LABEL_PREFIX__=
  define: __GNUC_STDC_INLINE__=1
  define: __STRICT_ANSI__=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_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_TEST_AND_SET_TRUEVAL=1
  define: __GCC_ATOMIC_POINTER_LOCK_FREE=2
  define: __GCC_HAVE_DWARF2_CFI_ASM=1
  define: __PRAGMA_REDEFINE_EXTNAME=1
  define: __SIZEOF_INT128__=16
  define: __SIZEOF_WCHAR_T__=4
  define: __SIZEOF_WINT_T__=4
  define: __SIZEOF_PTRDIFF_T__=8
  define: __amd64=1
  define: __amd64__=1
  define: __x86_64=1
  define: __x86_64__=1
  define: __SIZEOF_FLOAT80__=16
  define: __SIZEOF_FLOAT128__=16
  define: __ATOMIC_HLE_ACQUIRE=65536
  define: __ATOMIC_HLE_RELEASE=131072
  define: __GCC_ASM_FLAG_OUTPUTS__=1
  define: __k8=1
  define: __k8__=1
  define: __code_model_small__=1
  define: __MMX__=1
  define: __SSE__=1
  define: __SSE2__=1
  define: __FXSR__=1
  define: __SSE_MATH__=1
  define: __SSE2_MATH__=1
  define: __SEG_FS=1
  define: __SEG_GS=1
  define: __gnu_linux__=1
  define: __linux=1
  define: __linux__=1
  define: __unix=1
  define: __unix__=1
  define: __ELF__=1
  define: __DECIMAL_BID_FORMAT__=1
  define: _STDC_PREDEF_H=1
  define: __STDC_IEC_559__=1
  define: __STDC_IEC_559_COMPLEX__=1
  define: __STDC_ISO_10646__=201706L
  define: __STDC_NO_THREADS__=1
  stdver: --c11
queue_update_intellisense for files in tu of: /home/tristan957/Projects/socket-messenger/src/server/server.c
textDocument/codeAction
terminating child process: 5357
errorSquiggles count: 13
textDocument/codeAction

How can I get this information from VS code?
(and thanks for the info about the defines in the json file)

apfel-dev on 2 Sep 2020

@apfel-dev Set the C_Cpp.loggingLevel to "Debug": https://code.visualstudio.com/docs/cpp/enable-logging-cpp

sean-mcmanus on 3 Sep 2020

👍1

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