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Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772012]

Sun, 03 September 2017 17:28

Eclipse User

Dear all,

Before anybody points me back to existing threads on the topic, I have browsed through anything Google came up with. Nothing works for now.
I have gcc/g++ version 5.4.0 installed on Ubuntu 16.0.4 LTS

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.4' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)

running Eclipse Oxygen 4.7.0 Build id: 20170620-1800. I have already added "-ipthread" flag to cross G++ compiler, selected ISO C++11 language in Cross G++ compiler resulting in the compile sequence "-std=c++0x -D__GXX_EXPERIMENTAL_CXX0X__ -O3 -Wall -c -fmessage-length=0 -pthread"

index.php/fa/30586/0/

I am still having problems with "std::thread" call, with the hint showing "Type 'std::thread' could not be resolved" as shown below

index.php/fa/30588/0/

no matter what I do. Code compiles and executed fine, but the error is annoying ...

Thanks

Marek

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Re: Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772137 is a reply to message #1772012]

Tue, 05 September 2017 19:53

Eclipse User

Works for me.
index.php/fa/30614/0/

The tool settings for the Cross G++ Compiler affect only the generated makefile used for the build.
The error you are seeing is generated by the Indexer.
To inform the Indexer, you need to select the builtin provider for the cross compiler(or whatever you are using)
and put -std=c++11 in the provider command.
Such as ${COMMAND} -std=c++11 ${FLAGS} -E -P -v -dD "${INPUTS}"
Project --> Properties --> C/C++ General --> Preprocessor Include Paths, Macros etc. on the Providers tab
This is unnecessary with newer versions of GCC as they default to c++11 or higher.

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[Updated on: Tue, 05 September 2017 20:04] by Moderator

Re: Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772138 is a reply to message #1772137]

Tue, 05 September 2017 20:22

Eclipse User

Thank you for the answer, David

Since I am using the latest and greatest as far as GCC / G++ is concerned (unless I am mistaken, but 5.40, 20160609 build seems to be the latest available in Ubuntu chain), I am not sure what newer versions are there out.

I did have the setting for Cross GCC compiler already, as suggested - here is the screenshot:
index.php/fa/30615/0/

but after several code recompilations, nothing changes and I still have the very same issue.

I noticed though, that when I close Eclipse, restart, problem seems to go away until code is recompiled. Then it is back again :(

Marek

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[Updated on: Tue, 05 September 2017 22:26] by Moderator

Re: Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772228 is a reply to message #1772138]

Wed, 06 September 2017 21:19

Eclipse User

GCC 5.4 may be the latest release for Ubuntu but the current version is 7.2 released mid-August.
https://www.gnu.org/software/gcc/releases.html
I am using 6.3.1 released last December.

Don't know why the problem would come and go.
You might want to select allocate console view under the provider command and see if it is having problems.
You could also try rebuilding the index.

The indexer doesn't handle conditional code using variables that can take on multiple states within a project.
Place the include for <thread> outside of any conditional code that might change between compiles or configurations.
for ecample:

#define THISTIME
//undef THISTIME
#ifdef THISTIME
#include <thread>    // <--- move outside of the conditional code
:
#else
:
#endif

Other than that, I have no further suggestions.
Hope you can track down the cause.

Re: Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772230 is a reply to message #1772228]

Wed, 06 September 2017 21:28

Eclipse User

Thank you, David

I tried both of your suggestions and the problem persists, I am afraid.

I will see about updating my G++ version to 6.4.0 or newer ... perhaps that will knock something loose. if not, I am out of ideas at this time :(

Marek

Re: Type 'std::thread' could not be resolved with Eclipse 4.7 (Oxygen) [message #1772232 is a reply to message #1772230]

Wed, 06 September 2017 22:33

Eclipse User

I *believe* I found a way around this problem ...

- install gcc/g++ 6.4.0 or newer
- change default calls in Eclipse for gcc / g++ compiler and linker from gcc to gcc-7 (in my case I installed gcc/g++ 7.1.0) and g++ to g++-7
- add explicit path for include directory to where libraries are installed - in my case, it is "/usr/lib/gcc/x86_64-linux-gnu/7" (this last step does not seem to affect the display, though)

Screens with settings are shown below:

index.php/fa/30633/0/

It has been a trip ... but at least right now building & compilation process explicitly calls out version 7 of gcc/g++, as shown below

20:33:26 **** Incremental Build of configuration Release for project twamp-session-responder ****
make all 
Building file: ../src/classStats.cpp
Invoking: Cross G++ Compiler
g++-7 -std=c++1y -D__GXX_EXPERIMENTAL_CXX0X__ -I/usr/lib/gcc/x86_64-linux-gnu/7.1.0 -O3 -Wall -c -fmessage-length=0 -pthread -MMD -MP -MF"src/classStats.d" -MT"src/classStats.o" -o "src/classStats.o" "../src/classStats.cpp"
Finished building: ../src/classStats.cpp
 
Building file: ../src/main.cpp
Invoking: Cross G++ Compiler
g++-7 -std=c++1y -D__GXX_EXPERIMENTAL_CXX0X__ -I/usr/lib/gcc/x86_64-linux-gnu/7.1.0 -O3 -Wall -c -fmessage-length=0 -pthread -MMD -MP -MF"src/main.d" -MT"src/main.o" -o "src/main.o" "../src/main.cpp"
Finished building: ../src/main.cpp
 
Building target: twamp-session-responder
Invoking: Cross G++ Linker
g++-7  -o "twamp-session-responder"  ./src/classStats.o ./src/main.o   -lpthread
Finished building target: twamp-session-responder
 

20:33:30 Build Finished (took 4s.210ms)

Marek

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[Updated on: Wed, 06 September 2017 22:35] by Moderator

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