How to install other GCC versions in Linux

How to install other GCC versions in Linux
Preface

Sometimes, a fixed version of GCC needs to be installed in Linux to meet work requirements. For example, in Fedora22, compiling the cuda part of OpenCV requires GCC 4.9.X and earlier versions, while GCC of Fedora22 is between 5.1 and 5.3. For example, compiling matcaffe in Caffe requires GCC 4.7.X and later versions. Therefore, when installing an earlier version of GCC, you must do it yourself. The following are common operations:

1. Download GCC

Go to the GCC official website http://www.gnu.org/prep/ftp.html to find China and select an image address. For example, http://developer.hust.edu.cn/gnu/gcc /. Select the corresponding version of gcc-4.9.4/, download gcc-4.9.4.tar.gz compressed package to local.

Decompress the package to the current folder:

$ tar -zxvf gcc-4.9.4.tar.gz

2. Download the dependencies required for compilation

$ cd gcc-4.9.4$ ./contrib/download_prerequisites $ cd ..

3. Create a compilation output directory

$ mkdir gcc-build-4.9.4

4. Generate the makefile file

Enter the output directory, execute the command, and generate the makefile file File

$ cd gcc-build-4.9.4$ ../gcc-4.9.4/configure --enable-checking=release --enable-languages=c,c++ --disable-multilib

5. Compile

$ make -j24

The next step is to wait for about 40 minutes. PS: it is best not to do anything in the compilation process. The CPU is fully loaded throughout the process. If it is inexplicably terminated, there will be a lot of troubles in the future.

6. Install

After compilation, we can execute the installation:

# make install

7. Check the version

$ gcc -v$ g++ -v

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