How to enable C 11 C 0x support in Eclipse CDT

Question

Eclipse 3 7 1 CDT 1 4 1 GCC 4 6 2  This is an example of a piece of C  11 code   auto text   std  unique ptr lt char   gt  new char len      The Eclipse editor complains about   Function  unique ptr  could not be resolved   The Makefile compilation works fine  How to make Eclipse stop complaining about these sort of errors

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I had a similar problem using Eclipse C   2019-03 for a mixed C and C   project that used std  optional and std  swap  What worked for me was this  In the project Properties- gt C C   Build- gt Settings- gt Tool Settings- gt Cross G   Compiler  remove -std gnu  17 from Miscellaneous and put it in Dialect- gt Other Dialect Flags instead

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I don t know if it is only me  the highest ranked solution doesn t work for me  my eclipse version is just normal eclipse platform installed by using sudo apt-get install eclipse in Ubuntu But I found a solution which adopts method together from both the highest ranked solution and the second  what I did to make it work is described as below  Note that the other steps like creating a C   project etc  is ignored for simplicity   Once you have created the C   project   1  C C   General -  Paths and Symbols -  Symbols -  GNU C    Click  Add     and paste GXX EXPERIMENTAL CXX0X  ensure to append and prepend two underscores  into  Name  and leave  Value  blank    2  Under C C   Build  at project settings   find the Preprocessor Include Path and go to the Providers Tab  Deselect all except CDT GCC Builtin Compiler Settings  Then untag Share settings entries       Add the option -std c  11 to the text box called Command to get compiler specs  After performed above 2 and 2 only steps  it works  the eclipse is able to resolve the unique ptr  I don t know why this solution works  hope that it can help people

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When using a cross compiler  I often get advanced custom build systems meticulously crafted by colleagues  I use  Makefile Project with Existing code  so most of the other answers are not applicable    At the start of the project  I have to specify that I m using a cross compiler in the wizard for  Makefile Project with Existing Code   The annoying thing is that in the last 10 or so years  the cross compiler button on that wizard doesn t prompt for where the cross compiler is  So in a step that fixes the C   problem and the cross compiler problem  I have to go to the providers tab as mentioned by answers like  ravwojdyla above  but the provider I have to select is the cross-compiler provider  Then in the command box I put the full path to the compiler and I add -std gnu  11 for the C   standard I want to have support for  This works out as well as can be expected    You can do this to an existing project  The only thing you might need to do is rerun the indexer   I have never had to add the experimental flag or override   cplusplus s definition  The only thing is  if I have a substantial amount of modern C code  I have nowhere to put the C-specific standard option   And for when things are going really poorly  getting a parser log  using that command in the Indexer submenu  can be very informative

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Eclipse C C   does not recognize the symbol std  unique ptr even though you have included the C  11 memory header in your file      Assuming you are using the GNU C   compiler  this is what I did to fix   Project -  Properties -  C C   General -  Preprocessor Include Paths -  GNU C   -  CDT User Setting Entries   Click on the  Add     button Select  Preprocessor Macro  from the dropdown menu  Name    cplusplus     Value   201103L  Hit Apply  and then OK to go back to your project Then rebuild you C   index  Projects -  C C   Index -  Rebuild

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I found this article in the Eclipse forum  just followed those steps and it works for me  I am using Eclipse Indigo 20110615-0604 on Windows with a Cygwin setup    Make a new C   project  Default options for everything Once created  right-click the project and go to  Properties  C C   Build -  Settings -  Tool Settings -  GCC C   Compiler -  Miscellaneous -  Other Flags  Put -std c  0x  or for newer compiler version -std c  11 at the end       instead of GCC C   Compiler I have also Cygwin compiler C C   General -  Paths and Symbols -  Symbols -  GNU C    Click  Add     and paste   GXX EXPERIMENTAL CXX0X    ensure to append and prepend two underscores  into  Name  and leave  Value  blank  Hit Apply  do whatever it asks you to do  then hit OK    There is a description of this in the Eclipse FAQ now as well  Eclipse FAQ C  11 Features   Eclipse image setting

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I can t yet comment so am writing my own answer   It s related to   GXX EXPERIMENTAL CXX0X   and it s valid for Eclipse Juno and CDT 8 x    Some parts of this answer are already covered in other answers but I want it to be coherent   To make it possible to build using stdc  11  one have to add specific flag for compiler  You can do that via project properties  To modify project properties RMB andProject properties or ALT   ENTER  Then C C   Build -  Settings -  Tool Settings -  GCC C   Compiler -  Miscellaneous -  Other Flags  Put -std c  11 at the end of line  for GCC it will look something like  -c -fmessage-length 0 -std c  11  By adding -stdc  11 flag compiler  GCC  will declare   GXX EXPERIMENTAL CXX0X   by itself   At this point you can build project using all the goodness of C  11   The problem is that Eclipse has it s own parser to check for errors - that s why you re still getting all the nasty errors in Eclipse editor  while at the same time you can build and run project without any  There is a way to solve this problem by explicitly declaring   GXX EXPERIMENTAL CXX0X   flag for the project  one can do that  just like Carsten Greiner said    C C   General -  Paths and Symbols -  Symbols -  GNU C    Click  Add     and past   GXX EXPERIMENTAL CXX0X    ensure to append and prepend two underscores  into  Name  and leave  Value  blank   And now is the extra part I wanted to cover in comment to the first answer  go to  C C   General -  Preprocessor Include Path Macros etc  -  Providers  and Select CDT Managed Build Setting Entries then click APPLY and go back to Entries tab  under GNU C   there should be now CDT Managed Build Setting Entries check if inside there is defined   GXX EXPERIMENTAL CXX0X   if it is -  APPLY and rebuild index you should be fine at this point

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Update 2016    As of gcc 6  changes   the default C   dialect is C  14  That means that unless you explicitly need a newer or older dialect than than  you don t need to do anything with eclipse anymore    For Luna and Mars  This community wiki section incorporates the answer by Trismegistos   1  Before creating project  configure Eclipse syntax parser   Window -  Preferences -  C C   -  Build -  Settings -  Discovery -  CDT GCC Build-in Compiler Settings  in the text box entitled Command to get compiler specs append -std c  14  2  Create project  configuration depends on what kind of project you created   For project created as  File -  New -  Project -  C C   -  C   Project  Right click on created project and open  Properties -  C C   Build -  Settings -  Tool Settings -  GCC C   Compiler -  Dialect  Put -std c  14 into text box entitled other dialect flags or select ISO C  11 from the Language standard drop down   There s now a new way to solve this without the GXX EXPERIMENTAL hack   For most recent versions   Currently Juno and Kepler Luna    Under newer versions of Juno the settings are located at Project properties - gt  C C   General - gt  Preprocessor Include Paths  Macros etc  - gt  tab Providers - gt  CDT GCC Builtin Compiler Settings       Older versions 2012 2013     Under C C   Build  at project settings   find the Preprocessor Include Path and go to the Providers Tab  Deselect all except CDT GCC Builtin Compiler Settings  Then untag Share settings entries       Add the option -std c  11 to the text box called Command to get compiler specs  Go to paths and symbols  Under Symbols  click restore defaults  and then apply       Notes   Eclipse is picky about hitting apply  you need to do it every time you leave a settings tab    Self-promotion   I wrote my own more detailed instructions based on the above   http   scrupulousabstractions tumblr com post 36441490955 eclipse-mingw-builds  Thanks to the user Nobody at https   stackoverflow com a 13635080 1149664

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For Eclipse CDT Kepler what worked for me to get rid of std  thread unresolved symbol is    Go to Preferences- C C  - Build- Settings Select the Discovery tab Select CDT GCC Built-in Compiler Settings  Shared  Add the -std c  11 to the  Command to get the compiler specs   field such as         COMMAND  -E -P -v -dD -std c  11   INPUTS     Ok and Rebuild Index for the project    Adding -std c  11 to project Properties C C   Build- gt Settings- gt Tool Settings- gt GCC C   Compiler- gt Miscellaneous- gt Other Flags wasn t enough for Kepler  however it was enough for older versions such as Helios

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I had several issues too  Ubuntu 13 04 64-bit  g  -4 8  eclipse Juno 3 8 1  CDT 6 0 0   A lot of things are mentioned above  sorry to repeat those  but additionally I had problems utilizing   std  thread   as part of c  11  adding -pthread for the linker solves that issue   Anyway  finally these settings worked fine   Project -  Properties -  C C   Build -  Settings -  Miscellaneous   Add the   -std c  11   flag for the GCC and G   compilers  Click Apply   For the linker  same window  Miscellaneous  Linker flags  added the  -pthread   flag  Shared library settings  Shared object name  add the  -Wl --no-as-needed   flag too  Click Apply   C C   General -  Paths and symbols -  Symbols TAB  GNU C   selected  Add the    GXX EXPERIMENTAL CXX0X      no value   flag  Click Apply   C C   General -  Preprocessor Include paths   -  Providers tab   check  CDT GCC built-in Compiler Settings  and for  Command to get compiler specs   add the   -std c  11   flag  Uncheck Share  Click Apply   CDT Managages Build Setting Entries  check this too  Uncheck the two others  Click Apply   Going back to the Entries tab  GNU C   CDT Managages Build Setting Entries  you should now see your added    GXX EXPERIMENTAL CXX0X     entry   That s it  When coding  typing  std     can now auto-complete the thread class for instance  builds should work fine and there should be no  std  system error what    Enable multithreading to use std  thread  Operation not permitted   at runtime

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I had the same problem on my Eclipse Juno  These steps solved the problem     Go to Project - gt  Properties - gt  C C   General - gt  Path and Symbols - gt  Tab  Symbols    Add the symbol     cplusplus with the value 201103L

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For the latest  Juno  eclipse cdt the following worked for me  no need to declare   GXX EXPERIMENTAL CXX0X   on myself  This works for the the CDT indexer and as parameter for the compiler    your project name  -  right click -  properties   C C   General -  Preprocessor Include Paths  Macros etc  -  switch to the tab named  Providers     for  Configuration  select  Release   and afterwards  debug   switch off all providers and just select  CDT GCC Built-in Compiler Settings  uncheck  Share setting entries between projects  global provider   in the  Command to get compiler specs   add  -std c  11  without the quotes  may work with quotes too  hit apply and close the options rebuild the index   Now all the c  11 related stuff should be resolved correctly by the indexer   win7 x64  latest official eclipse with cdt mingw-w64 gcc 4 7 2 from the mingwbuilds project on sourceforge

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Neither the hack nor the cleaner version work for Indigo   The hack is ignored  and the required configuration options are missing   For no apparent reason  build started working after not working and not providing any useful reason why   At least from the command line  I get reproducible results

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Instruction For Eclipse CDT 4 4 Luna and 4 5 Mars  First  before creating project  configure Eclipse syntax parser    Window -  Preferences -  C C   -  Build -  Settings -  Discovery -  CDT GCC Build-in Compiler Settings  in the text box entitled Command to get compiler specs append -std c  11  Now you can create project  configuration depends on what kind of project you created    For project created as  File -  New -  Project -  C C   -  C   Project  Right click on created project and open   Properties -  C C   Build -  Settings -  Tool Settings -  GCC C   Compiler -  Dialect  Put -std c  11 into text box entitled other dialect flags or select ISO C  11 from the Language standard drop down   For CMake project  Generate eclipse project files  inside your project   mkdir build cd build cmake -G Eclipse CDT4 - Unix Makefiles  -D CMAKE BUILD TYPE Debug      Then import generated directory to eclipse as standard eclipse project  Right click project and open  Properties -  C C   General -  Preprocessor Include Paths  Marcos etc  -  Providers  enable CDT GCC Build-in Compiler Settings and move it higher than Contributed PathEntry Containers  This is important   Last Common Step   recompile  regenerate Project - C C   Index and restart Eclipse

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right-click the project and go to  Properties  C C   Build -  Settings -  Tool Settings -  GCC C   Compiler -  Miscellaneous -  Other Flags  Put -lm at the end of other flags text box and OK

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I solved it this way on a Mac  I used Homebrew to install the latest version of gcc g    They land in  usr local bin with includes in  usr local include   I CD d into  usr local bin and made a symlink from g   7whatever to just g   cause that   bit is annoying   Then I went to MyProject -  Properties -  C C   Build -  Settings -  GCC C   Compiler and changed the command from  g    to   usr local bin g     If you decide not to make the symbolic link  you can be more specific   Do the same thing for the linker   Apply and Apply and Close  Let it rebuild the index  For a while  it showed a daunting number of errors  but I think that was while building indexes  While I was figuring out the errors  they all disappeared without further action     I think without verifying that you could also go into Eclipse -  Properties -  C C   -  Core Build Toolchains and edit those with different paths  but I m not sure what that will do

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For me on Eclipse Neon I followed Trismegistos answer here above   YET I also added an additional step     Go to project --  Properties --  C   General --  Preprocessor Include paths Macros etc  --  Providers --  CDT Cross GCC Built-in Compiler Settings  append the flag  -std c  11    Hit apply and OK   Cheers   Guy

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To get support for C  14 in Eclipse Luna  you could do these steps    In C   General - gt  Preprocessor Include - gt  Providers - gt  CDT Cross GCC Built-in Compiler Settings  add  -std c  14  In C   Build - gt  Settings - gt  Cross G   Compiler - gt  Miscellaneous  add  -std c  14    Reindex your project and eventually restart Eclipse  It should work as expected

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