Why does clang with libc in c 0x mode fail to link this boost::program_options example?

Why doesn't clang with libc in c 0x mode link this boost::program_options example?

Compiling an example program involving boost::program_options with clang using libc and c 0x mode results in undefined symbol errors. However, the same code compiles and links successfully using g -mp-4.7 or clang without libc .

The Issue

The issue arises from the incompatibility of boost::program_options, which is built using libstdc , with libc . In order to avoid accidental mixing of incompatible standard libraries and ensure binary compatibility, libc employs a C 11 feature called "inline namespace." This changes the Application Binary Interface (ABI) of std::string without affecting its Application Programming Interface (API).

The Solution

To resolve this compatibility issue, rebuild boost using clang with the -stdlib=libc flag:

clang++ -stdlib=libc++

This action will rebuild boost with libc and avoid the symbol conflicts that arise from using incompatible standard libraries.

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