Does GCC Support C11 and Other C Standards?

Introduction to C Standards in GCC

GUIC Compiler (GCC) supports a wide range of C language standards, from the earliest C90/C89 to the more recent C11, C14, C17, and beyond. To use a specific standard, you simply need to specify it when compiling your code. Here's how:

When you compile a program with GCC, you can use the -stdcommand-option flag to specify the standard you wish to use. The accepted values for this flag include:

c11 c14 c17 c1z c2a c03

However, some new features added in more recent standards may not compile with older versions of GCC. Features like auto_ptr, std::random_shuffle, and register keyword might be deprecated or removed in older versions. If you try to use an older standard like C03 with the C1z flag, it will result in errors, as certain features are reserved and not supported.

Checking GCC Version and Support for C11

To find out which C standard your version of GCC supports, you can run the following command:

Run gcc --version to check the version of your GCC compiler. Use gcc -v --help to see the available language compatibility options. Compile your code with the -stdc11 flag to ensure it works with C11. If it doesn't report any errors, then you're all set.

For more information on compiling C11 with GCC, you can refer to the Stack Overflow post Compiling C11 with g.

Overview of C11 Support in GCC

Reasonably recent versions of GCC, such as GCC 4.7 and newer, provide comprehensive C11 support. GCC 4.9, in particular, boasts nearly complete ISO C11 support, with a few minor bugs. Here's a summary of C11 support in different versions of GCC:

4.9: ISO C11 support is comparable to ISO C99 support, with nearly complete support except for some minor bugs. 4.7: GCC 4.7 introduced substantial C11 support. 4.3-4.6: Earlier versions had varying degrees of experimental support for C in GCC 4.3 through 4.6.

From version 9 onwards, GCC provides support for C11, C14, and C17. To specify which standard to use, add the appropriate flag to your GCC command, such as:

-stdc17 -stdc14 -stdc11 -stdc03 -stdc98

Latest GCC Status and C11 Support

For the most up-to-date information on GCC's C11 support, you can refer to the official documentation on C Standards Support in GCC. According to the latest version (as of this writing), GCC 4.9 provides the following support:

ISO C11 support is comparable to ISO C99 support. Substantial support except for corner cases. Some floating-point issues related to C99 Annexes F and G, and optional Annexes K and L are still being addressed.

For detailed information and more updates, refer to the official GCC documentation.

Conclusion: GCC provides excellent support for C11 and other modern C standards, allowing developers to take advantage of the latest language features and improvements. Always check your GCC version and use the appropriate flags to ensure compatibility.