When is the -stdlib=libstdc Flag Required During Compilation?

When Does Compilation Require the -stdlib=libstdc Flag?

The -stdlib=libstdc flag directs the compiler and linker to use the libstdc standard library implementation during compilation. However, it's not always necessary to explicitly specify this flag.

When Using Linux or Modern GCC on Other Platforms

For most Linux distributions and current GCC versions, libstdc is the default standard library implementation. Therefore, using the -stdlib=libstdc flag is not required when compiling C 11 code on these platforms. Simply use the following commands:

g++ -std=c++11 input.cxx -o a.out (GNU compiler)
g++ -std=gnu++11 input.cxx -o a.out

On macOS Prior to Mavericks

On macOS releases before Mavericks, g was a symbolic link to clang . Apple's older libstdc implementation was the default. To use libc , which provides C 11 library support, the -stdlib=libc flag was necessary:

g++ -std=c++11 -stdlib=libc++ input.cxx -o a.out (clang, not GNU compiler!)
g++ -std=gnu++11 -stdlib=libc++ input.cxx -o a.out (clang, not GNU compiler!)
clang++ -std=c++11 -stdlib=libc++ input.cxx -o a.out
clang++ -std=gnu++11 -stdlib=libc++ input.cxx -o a.out

On macOS Since Mavericks

On macOS Mavericks and later, libc is the default. Explicitly passing the -stdlib=libstdc flag is unnecessary:

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

Exceptions

There may be specific cases where explicitly using the -stdlib=libstdc flag is beneficial:

• When linking against an external library that requires libstdc for compatibility
• When experiencing symbol conflicts between libstdc and other libraries
• For debugging or troubleshooting purposes

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