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Fix building with clang in header-only mode

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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.

(cherry picked from commit 75f862bf574743e9c68e2b694142bdaf7cfcc44d)
This commit is contained in:
Sean LK 2016-06-25 05:16:22 +00:00 committed by Jonathan Müller
parent b838eb0c2e
commit 1127e7a953
1 changed files with 1 additions and 1 deletions
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fmt/format.h
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@ -841,7 +841,7 @@ struct FMT_API BasicData {
# define FMT_USE_EXTERN_TEMPLATES (__clang__ && FMT_USE_VARIADIC_TEMPLATES)
#endif
#if FMT_USE_EXTERN_TEMPLATES
#if FMT_USE_EXTERN_TEMPLATES && !defined(FMT_HEADER_ONLY)
extern template struct BasicData<void>;
#endif