When to Specify \'-stdlib=libstdc \' when Compiling with GCC?

When to Use -stdlib=libstdc

When compiling with gcc, the -stdlib=libstdc flag specifies the C standard library to use. In most cases, the compiler will automatically use libstdc , the GNU C library, as the default. However, there are instances where it may be necessary to explicitly specify -stdlib=libstdc .

Compiler-Specific Behavior

On Linux, all major distributions use libstdc as the default C library, and recent GCC versions support C 11 by default. To compile C 11 code, you can use either:

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

On OS X prior to Mavericks, g was an alias for clang , and Apple's older libstdc was the default. To use libc , which includes C 11 library support, pass -stdlib=libc . Compilation options include:

• g -std=c 11 -stdlib=libc input.cxx -o a.out
• g -std=gnu 11 -stdlib=libc input.cxx -o a.out
• clang -std=c 11 -stdlib=libc input.cxx -o a.out
• clang -std=gnu 11 -stdlib=libc input.cxx -o a.out

OS X Mavericks and Later

Since OS X Mavericks, libc has become the default C library. You should refrain from using the -stdlib= flag in this case. Notably, Xcode 10 and later no longer support compiling against libstdc .

Recommended Compilation Options

• Linux: Use g -std=c 11 input.cxx -o a.out or g -std=gnu 11 input.cxx -o a.out
• OS X (before Mavericks): Use g -std=c 11 -stdlib=libc input.cxx -o a.out or clang -std=c 11 -stdlib=libc input.cxx -o a.out
• OS X (Mavericks and later): Use clang -std=c 11 input.cxx -o a.out or clang -std=gnu 11 input.cxx -o a.out

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