When Should \'-stdlib=libstdc \' Be Used with GCC?

Determining the Necessity of Using '-stdlib=libstdc ' with GCC

When compiling code with GCC, it's crucial to understand the impact of the '-stdlib' flag. This flag specifies which standard library implementation to use, specifically 'libstdc ' or 'libc '.

Default Behavior

By default, GCC will typically use 'libstdc ' for Linux systems. This is because 'libstdc ' is the GNU implementation of the C standard library, and it's widely supported in most distributions.

C 11 Support

To compile C 11 code, you must pass '-std=c 11' to the compiler. However, unless explicitly specified otherwise, GCC will still use its default standard library, namely 'libstdc ', which provides support for C 11 and later versions.

Specific Scenarios

There are certain situations where using '-stdlib=libstdc ' may be necessary:

• OS X before Mavericks: Before the release of macOS Mavericks, 'g ' was actually an alias for the Clang compiler. Apple's older versions of 'libstdc ' were used by default. If you wanted to use 'libc ', which included support for C 11, you had to specify '-stdlib=libc '.
• OS X since Mavericks: Since macOS Mavericks, 'libc ' became the default C standard library and is used automatically. Passing '-stdlib' is no longer necessary.

Conclusion

In most cases, the default behavior of GCC using 'libstdc ' provides sufficient support for compiling C 11 and later code. However, for specific scenarios such as using Clang on older OS X versions or explicitly requesting 'libstdc ', '-stdlib=libstdc ' can be used to specify the desired standard library implementation.

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