Compiler and Compilation Options

Using GCC of a Later Version

Upgrade the GCC in Ubuntu to GCC 10.1.0.

Obtain the latest GCC source package.
To obtain the source package, visit http://ftp.gnu.org/gnu/gcc/gcc-10.1.0.
Decompress the obtained package.
```
tar -xzvf gcc-10.1.0.tar.gz
```
Go to the directory generated after the decompression and run the download_prerequisites script.
```
cd gcc-10.1.0/
./contrib/download_prerequisites
```
The download_prerequisites script file is used to download, configure, and install the dependency library.
Run the following commands to create a directory and save the output of the download_prerequisites script to the directory:
```
mkdir gcc_temp
cd gcc_temp
../configure -enable-checking=release -enable-languages=c,c++ -disable-multilib
```
Perform the compilation and installation.
1. Perform the compilation.
```
make -j32
```
  The compilation may last one to two hours. Pay attention to the time arrangement before the compilation.
2. Perform the installation.
  - Performing the installation as the root user:
```
make install
```
  - Performing the installation as a common user:
```
sudo make install
```
    Figure 1 Installation process
Verify the installation.
Run any of the following commands to check the GCC version:
```
gcc --version
gcc -v
g++ -v
```
If the displayed GCC version is earlier than the required version, restart the system. Alternatively, run the which gcc command to check the GCC installation directory, and then run the /usr/local/bin/gcc -v command to check the version information. Generally, the GCC is installed in the directory.

Figure 2 Installation succeeded

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