Fix building with clang in header-only mode #348
Merged
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Building under a recent clang compiler causes the use of an extern
template for the BasicData struct. However, the only instantiation of
that structure in format.cc is only done if FMT_HEADER_ONLY is not
defined. This causes the build to fail in C++11 or C++14 mode.
Therefore, only declare the BasicData template as extern if
FMT_HEADER_ONLY is not defined.