Ubuntu12.04GCC4.7 enable C ++ 11

To use the templatealiases feature, GCC4.7. and do not want to compile the source code, so install it as follows. Sudoadd-apt-repositoryppa: Ubuntu-toolchain-r/testsudoapt-getupdatesudoapt-get

To use the template aliases feature, GCC4.7.

And do not want to compile the source code, so follow the method below to install.

1. Sudo add-apt-repository ppa: Ubuntu-toolchain-r/test
2. Sudo apt-get update
3. Sudo apt-get install gcc-4.7
4. Sudo apt-get install g ++-4.7

If multiple containers exist in the Ubuntu 12.04 system, you can configure them in the cmakelists.txt at the top of the cmakeproject:

1. Cmake_minimum_required (VERSION 2.8.7)
2. Set (CMAKE_C_COMPILER "/usr/bin/gcc-4.7 ")
3. Set (CMAKE_CXX_COMPILER "/usr/bin/g ++-4.7 ")
4. Project (sample)
5. Add_subdirectory (src bin)

Then run cmake In the build directory. You can see:

1. Chenshu @ chenshu-beijing :~ /Work/research/tree/normal_tree/build $ cmake ..
2. -- The C compiler identification is GNU
3. -- The CXX compiler identification is GNU
4. -- Check for working C compiler:/usr/bin/gcc-4.7
5. -- Check for working C compiler:/usr/bin/gcc-4.7 -- works
6. -- Detecting C compiler ABI info
7. -- Detecting C compiler ABI info-done
8. -- Check for working CXX compiler:/usr/bin/g +++-4.7
9. -- Check for working CXX compiler:/usr/bin/g ++-4.7 -- works
10. -- Detecting CXX compiler ABI info
11. -- Detecting CXX compiler ABI info-done
12. -- Processing ing done
13. -- Generating done
14. -- Build files have been written to:/home/chenshu/work/research/tree/normal_tree/build

However, my method is not the best method recommended by CMake. There are three methods available for reference:

Http://www.cmake.org/Wiki/CMake_FAQ#Method_3_.28avoid.29:_use_set.28.29

1. How do I use a different compiler?
2. [Edit] Method 1: use environment variables
3. For C and C ++, set the CC and CXX environment variables. this method is not guaranteed to work for all generators. (Specifically, if you are trying to set Xcode's GCC_VERSION, this method confuses Xcode .)
4. For example:
5. CC = gcc-4.2 CXX =/usr/bin/g + +-4.2 cmake-G "Your Generator" path/to/your/source
6. [Edit] Method 2: use cmake-D
7. Set the appropriate CMAKE_FOO_COMPILER variable (s) to a valid compiler name or full path on the command-line using cmake-D.
8. For example:
9. Cmake-G "Your Generator"-D CMAKE_C_COMPILER = gcc-4.2-D CMAKE_CXX_COMPILER = g ++-4.2 path/to/your/source
10. [Edit] Method 3 (avoid): use set ()
11. Set the appropriate CMAKE_FOO_COMPILER variable (s) to a valid compiler name or full path in a list file using set (). this must be done before any language is set (ie before any project () or enable_language () command ).
12. For example:
13. Set (CMAKE_C_COMPILER "gcc-4.2 ")
14. Set (CMAKE_CXX_COMPILER "/usr/bin/g ++-4.2 ")
16. Project ("YourProjectName ")
17. [Edit]

C ++ 11 is disabled by default. Add this line to the src/CMakeLists.txt file:

1. SET (CMAKE_CXX_FLAGS "-std = c ++ 11") # Add c ++ 11 functionality

Then run

Cmake ..

Make VERBOSE = 1

You will see that the compiled g ++ command is followed:

1. /Usr/bin/g ++-4.7-std = c ++ 11

Now we have succeeded. Enjoy C ++ 11.

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