How do I enable C 11 in gcc

Question

I use gcc 4 8 1 from http   hpc sourceforge net on Mac OSX Mountain Lion  I am trying to compile a C   program which uses the to string function in  lt string gt   I need to use the flag -std c  11 every time   g   -std c  11 -o testcode1 code1 cpp   Is there a way to include this flag by default

User · Answer

As previously mentioned - in case of a project, Makefile or otherwise, this is a project configuration issue, where you'll likely need to specify other flags too.

But what about one-off programs, where you would normally just write g++ file.cpp && ./a.out?

Well, I would much like to have some #pragma to turn in on at source level, or maybe a default extension - say .cxx or .C11 or whatever, trigger it by default. But as of today, there is no such feature.

But, as you probably are working in a manual environment (i.e. shell), you can just have an alias in you .bashrc (or whatever):

alias g++11="g++ -std=c++0x"

or, for newer G++ (and when you want to feel "real C++11")

alias g++11="g++ -std=c++11"

You can even alias to g++ itself, if you hate C++03 that much ;)

User · Answer

H2CO3 is right  you can use a makefile with the CXXFLAGS set with -std c  11 A makefile is a simple text file with instructions about how to compile your program  Create a new file named Makefile  with a capital M   To automatically compile your code just type the make command in a terminal  You may have to install make    Here s a simple one     CXX clang   CXXFLAGS -g -std c  11 -Wall -pedantic BIN prog  SRC   wildcard   cpp  OBJ   SRC   cpp   o   all    OBJ        CXX  -o   BIN        o    c       CXX     -c   lt   clean      rm -f   o     rm   BIN    It assumes that all the  cpp files are in the same directory as the makefile  But you can easily tweak your makefile to support a src  include and build directories   Edit   I modified the default c   compiler  my version of g   isn t up-to-date  With clang   this makefile works fine

User · Answer

I think you could do it using a specs file   Under MinGW you could run gcc -dumpspecs   specs  Where it says    cpp    posix -D POSIX SOURCE    mthreads -D MT    You change it to   cpp    posix -D POSIX SOURCE    mthreads -D MT  -std c  11   And then place it in  mingw lib gcc mingw32  lt version gt  specs  I m sure you could do the same without a MinGW build  Not sure where to place the specs file though   The folder is probably either  gcc lib  or  gcc

User · Answer

If you are using sublime then this code may work if you add it in build as code for building system  You can use this link for more information          shell cmd    g       file    -std c  1y -o     file path    file base name           file regex                 0-9       0-9                    working dir      file path         selector    source c  source c           variants                                name    Run                shell cmd    g       file    -std c  1y -o     file path    file base name     amp  amp      file path    file base name

[c++11] How do I enable C++11 in gcc?

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