When is the \"-stdlib=libstdc \" Flag Required When Compiling with GCC?

When to Use the "-stdlib=libstdc " Flag When Compiling with GCC

In some scenarios, explicitly setting the "-stdlib=libstdc " flag is necessary when compiling with GCC. Here are the circumstances:

On Linux:

By default, Linux distributions use libstdc as the standard C library. Moreover, modern versions of GCC inherently support C 11 in their bundled libstdc . Therefore, to compile C 11 code on Linux, simply using the "-std=c 11" flag with g should suffice:

g++ -std=c++11 input.cxx -o a.out

On Pre-Mavericks OS X:

Historically, g on OS X was an alias for clang . In this context, Apple's older version of libstdc was the default. To leverage libc , which included C 11 support, you had to explicitly specify "-stdlib=libc ":

g++ -std=c++11 -stdlib=libc++ input.cxx -o a.out

On Mavericks and Later OS X:

Starting with OS X Mavericks, libc became the default C library. Accordingly, there is no need to use the "-stdlib=" flag:

clang++ -std=c++11 input.cxx -o a.out

Building Against libstdc on OS X:

With Xcode 10 onwards, building applications against libstdc is no longer supported. Existing code compiled against libstdc will continue to function, but new code compilation is not permissible.

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